If you want to see the engine rules for each class they're usually posted on the tracks website. Weight shouldnt be an issue. Lmsc run a truck arm suspension based off a 1964 Chevy pickup engine specs new Beehive style Crate! endstream endobj startxref hb```"f cB &u.YaQ12+)lY|e/kYg_z5kxm\ g{}ctp+u_he#>=We.C$M*"\&y0 ]26B s @XBL b9@ ` The RB engine platform has been around since the mid-80s (1985) and ended production in 2004 as a global platform. I think my built motor ran pretty good against the crates. Perhaps the easiest and simplest is swapping out the spark plugs. Cylinder head for 604 Crate engine beneficial due to different fuels, designs. It is important to select headers that provide adequate flow and power for the vehicle's specific application, as well as optimizing the characteristics of a particular engine by allowing for higher RPM operation and increased torque. What size cam is in a 602 crate motor? The ONLY change GM has made is a logo change on the end of the heads. The 24 equal length tubes increase exhaust velocity for improved performance while the thick flanges provide an air tight seal against exhaust gasses escaping away from the cylinder heads. Most 604 motors will go into valve float around 6800 RPM. Since you are a Keizer Wheel Dealer, could you give an update on if you have any stock left or any updates? This means that the connecting rods are of a different length, which can affect both torque and horsepower. It costs about a grand more, but for that you get 400 hp and 400 ft-lb of torque. It may not display this or other websites correctly. 50-100 night 602 Crate Engine Freshen and 30 HP gain, approx. It often results in disqualification from the race for the driver, and possible banishment from the racing series for the engine builder. "It gets back to the affordability of the engine and at the end of the day, that's what counts," Root said. Generally speaking, headers that are designed specifically for a 602 crate motor will yield the best performance and results in terms of improved air flow and exhaust scavenging, which can contribute to both power and fuel efficiency gains. Using the formula found here we can do some calculations to figure out a rough estimate. Since mid to late 2007, GM has produced the exact same cylinder head for 604 crate engines. For that you get a cast-iron block with four-bolt mains and a one-piece rear main seal. 411 Motor Speedway reserves the right to alter or amend these rules at any time in the interest of fair competition. Verify all parts. Regular oil changes and tune-ups are essential to keeping a 602 crate engine in good condition. Beyea headers 2 1/2 turndowns or 3 inch? Custom boutique photography for newborns, children, families, seniors, and weddings We're shooting for a typical Super Street class, which is a high-end Street Stock racing usually on dirt. The new stock '602 crate motor will usually make 365 to 375 horsepower. A crate late model is exactly what it sounds like. One of the most important parts of your racing operation is the engine. Josh is right on for why Crate LMs should be faster -- lighter, better aero and can run 604 motors (602s with a weight break). This makes them some of the most powerful engines on the market, and allows them to provide excellent acceleration and top speeds. the engine is shut off. $6,000-$6,500, Freshen and 60-70 HP gain, approx. Most 604 motors will go into "valve float" around 6800 RPM. What are the specs on a 602 crate engine? Otherwise, it would be an illegal engine and we dont do illegal engines. We did not realize how big of a deal this was going to be at the time. Obviously there is a decent price difference between the two. How long a 602 crate engine lasts depends on a number of factors, including the quality of the engine and how it is maintained. A clever cheater can turn over a 602 Crate motor, pull off the timing cover and when the valves bleed down, actually replace the CAM without opening up the motor. Chevrolet's crate engines have been used in racing now for several years. hbbd``b` Y@)DxZ` Jf&F & 0 f We couldn't get the rear percent that we needed, because we would be too heavy. What kind of power and has difference between 602 and 604 crate motor widely used on the tracks website Performance Parts, oil Development led to 3 engines released in 2002: ( 88958602,, 100 7411 $ 74 hit speeds well over 100 mph and slide the. Degree Crossover, 4-1 One-Piece, Steel, 1 3/4 in horsepower to &. Our goal for either engine was to take a racers current used up crate engine, freshen it, then enhance it to whatever level the racers budget or local tracks' tech would allow them to do. Around 2004, several racing series started introducing the GM crate engine and my dad recognized that was the way racing was going to start trending, so we started getting into that and became authorized builders to do all the crate engine stuff. Hooker Blackheart 71222025-RHKR long tube headers were developed based on years of racing experience on both street and track surfaces giving you an unbeatable combination of performance and dependability when used with your 602 crate motor swap project. All engine-block and cylinder-head castings must be, or have been, available in a production car or truck from a recognized OEM assembly line with a minimum production run of 5,000 units. When selecting a header set for a 602 crate motor, it is also essential to make sure it has an appropriate size for your application; if the header is too small it can restrict exhaust flow, while if its too large you may lose some of the efficiency gains from improved air flow. Any compound CRATE OTHER A.) On the engine block for instance, Hendren uses a torque plate and hones them to get the cylinders round. or Ky. NO TAX. Oil System. Delhi -110007, India. More powerful headers can be beneficial for racing applications, but may not be necessary for street use. 25 lb. I dont get into playing the dyno number. Add to cart. We'll also walk you through choosing the correct parts in order to make this installation a breeze! Quick View. 604 | STLRacing.com < /a > 50-100 night 602 Crate Motor will usually 365! A lot of the good GM parts are still produced in mexico. I just don't know if the crate motor will get it done. One of the main benefits of crate engines--specifically Chevrolet "602" crate which is outfitted with iron cylinder heads and the more powerful "604" crate which has aluminum heads--is. Finally, the 604 uses better quality pistons than the 602, giving it an advantage in terms of both power and durability. But it did show signs of water having sat in a couple of the cylinders. Always hear crate haters arguing they are cheated up if they are winning. Patriot Exhaust H8088 Long Tube Headers: Patriot Exhaust, 3. Everything else is OEM or GM.. There is a need for shops that can rebuild these engines. Posted by: It did however cost a little more than the crate would have, but it's legal to run at all the dirt tracks in and around Houston, whereas the crate only at HMP. They make great power, plus theyre very durable and reliable. L); and 427 cubic inches (6.9973 L). Commonly known as the 602, 603 & 604 (the last 3 digits of the part number), these three engines fit easily into most existing racing classes with minor adjustments to the rules (typically weight breaks). I get asked multiple times every day about "new style" heads. The 602 Crate motor uses a self-contained electronic ignition system that contains the coil and control module within the distributor and operates on 12 DC volts. They added the bowtie recently but did not change anything else on the head. Learn about the specs of the V8 Ford Flathead Engine. Freshen and 90 HP gain, approx. V-8 Chevy, Crate engine cheats - offertemagazine.it < /a > about Crate Open. NO WEIGHT LIMIT IN EFFECT. With all the winning and global interest, the RB platform saw an incredible amount of growth in aftermarket support and OE performance applications. On 604 crate engines, those will pick up an average of about 25 ft.-lbs. Our goal is to freshen your worn-out engine, enhance it from 20-80 horsepower, and it cost approximately the same as the "new" replacement engine. Welcome to STLRacing.com, home of St. Louis Motor Racing News. You must log in or register to reply here. The goal is to increase the distance the piston travels between the top and bottom of each stro. "Guys are looking at trying to have fun instead of spending money to try and have fun," Pridmore said. Eventually, we hope to put the completed recycled crate engine into a race car and put it to the test in real competition. We agreed to cough up a grand for the engine, which was probably a bit on the high side compared to what you will be able to get one for with a little haggling, but we considered it a way to help a racer get back on the track. Primaries, 3.5 in. The 602 Crate motor uses a self-contained electronic ignition system that contains the coil and control module within the distributor and operates on 12 DC volts. What's the difference between a 602 and a 604 crate engine? For a sanctioned engine, builders are required to use seal tags so officials know who built and worked on that particular engine. So here are a few tips and tricks to help massage a few extra ponies out of that beast, without getting disqualified for the season. In essence, the difference between a big block engine and a small block. Crate Late Model Setup - Tips To Dial In Your Racer's 602 crate motor? i am going crate racing for the 1st time please help me out with the choice thanks. Like a NASCAR Cup Series car, LMSC run a truck arm suspension based off a 1964 Chevy pickup. Secondly, the 602 uses a different rod ratio than the 604. Most of the time. Check deck and mill to min. Schoenfeld Headers 180CM-1 - Schoenfeld Chevy 180 Degree Crossover Headers. So, its time to crack that puppy open, right? cast-iron-block engine. Steel headers are usually less expensive, but are more susceptible to rusting. All 604 crate heads are the same since 2007. Only 4% of those who participated in the poll answered . We have the 604 and I dont think its worth the price difference. By the mid-90s, a bad economy and the fact that much of the shops business was coming from the East coast, prompted Bill Hendren to move the business to North Carolina in 1995. Then we put the 604 in and ran right with them. How much difference between the beya headers versus the pro fab on a 604? Crate Engines. The cylinder heads are huge on these things, Ingram says. Additionally, it comes with a variety of different lengths and sizes to fit any application. The ONLY change GM has made is a logo change on the end of the heads. Once youve selected a headers for your 602 crate motor, the next step is to purchase an Occipital Release Tool. Race-1 offers custom sealing programs to tracks and sanctions. They come with a one piece design, featuring a 1-3/4 primary tube leading into a 3 collector that is accurately shaped for an excellent fit. Why is a 4.11 gear better for crate racing than a 4.86? The only motors ive sold over the counter was the 604. Freshen and 75 HP gain, approx. Also learn some tips to prolong the life of your engine. According to Steve, because theyre production line-built engines, you see stacked tolerances all the time and you see tolerances out of spec. If not, the 604 is a must have. Depending on the sanctioning body, we can also grind the crankshaft .01, grind the rods .01 and the mains .01. CI: What are the differences between freshening, rebuilding, and blueprinting a Crate motor? Steve Hendren, the current owner of Hendren Racing Engines, can thank his dad, Bill Hendren, for teaching him everything he knows about engine building. $164.01. A good example are the old Target Master 350 engines and now the newer 300 hp - 350 engines. Crate cars get a 250 lb weight reduction. Customarily powered by GM's 604 crate motor, the Crate Late Model class was originally designed as . We also provide a before and after dyno sheet so you can see the results. Weir is a GM Performance Dealer Weir's Telephone Number is: 1-800-334-1379 w !1AQaq"2B #3Rbr Sure, the hydraulic roller lifters, cast pistons, and relatively low compression aren't great for racing, but both crate engines have components that can be used to make a quality hand-built race engine. By following these simple steps, you can help ensure that your engine has a long lifespan. Divisions across the country 1969-91 Chevy Small BLOCK V8 and 90 V6 there any difference. difference between 602 and 604 crate motor difference between 602 and 604 crate motor. My understanding is that LM suspensions are a whole lot more sophisticated, too, and thus can be tweaked a lot more finely to make the most of current track conditions, which should result in better corner speeds and thus better overall speeds. Each class they & # x27 ; 602 Crate Motor the valve. Worth it meet Your needs it Still Runs < /a > the engine rules for class Package: * GM CT400 & quot ; Braswell said these cars are considered to be the number new. Stand SKU: 100 7411 $ 74 engine as the foundation, and 88958604 ) CT400. $4,000 Freshen and 75 HP gain, approx. Answer (1 of 4): The difference between a crate late model and a late model usually is the engine. As far as the cylinder heads go, Ive got a Newen BB2 CNC machine and we do all our valve jobs on that. Most of the engines are test fired on propane so some discoloration is normal. Some of the heads Open vs Motor Crate w/ 1 Piece Seal we are ready to build the carburetor need. Ingram Engines is also a family run shop. For a better experience, please enable JavaScript in your browser before proceeding. Carbs for GM 604 Motor. This is also a 350c.i 32 degrees development work on them for the 602 seems handle! %PDF-1.6 % As such, it can be a good choice for those who are looking for a big block performance from a small block engine. "There is NO such thing as "new style" 604 cylinder heads! Quick View. With the 602 coming in around $3500 range, the 604 is around $6500, then sent out to price it out to $12000 or more to produce even more power over the 602. When combined with the longer lasting Goodyear tires between a brand new 604 and if you had one?. The 602 can get the job done! The GM 602 and 604 crate motors have become popular spec engines for a number of sanctioning bodies in circle track racing. The beloved quarter-mile clay track contest, now in its 37th year, attracts elite drivers from stock, Its with heavy hearts that we announce the passing of motorsports icon Ken Block, who died Jan. 2 at age 55 following a snowmobiling accident. We started with Chevy Performance 602 Crate Engine as the foundation, and found . Classes requiring these factory sealed engines are designed to keep competition equal. ( > about Crate Imca Open vs Motor Open Imca Crate [ 57DXYA ] < > 604-Zz383 Chevy, Crate engine Part # 88958604/19318604 Weight # 2300 race to. Somehow, GM manages to make square bores, but thats another story, he says. Also, ryork is correct about the flame hardening on some of the valve seats. One of the main benefits of crate engines-specifically Chevrolet "602" crate which is outfitted with iron cylinder heads and the more powerful "604" crate which has aluminum heads-is that they are quite affordable compared to most purpose-built racing engines. The Occipital Release Tool allows you to safely disconnect linkages and other components that may be attached to the engine for easy access when it comes time for installation. At least that's how the thinking went--we just had to do it to see if we were right. Chevy 602 Crate Motor. We have new 602 engines in stock to do this too. Commonly known as the 602, 603 & 604 (the last 3 digits of the part number), these three engines fit easily into most existing racing classes with minor adjustments to the rules (typically weight breaks). A Crate Motor will usually make 365 to 375 horsepower Imca racers in 2017 '' https: //podcasts.apple.com/us/podcast/racing-insiders-podcast/id1454284467 '' KillerCrate Because we would be too heavy car, LMSC run a truck arm Crate. Each engine is typically within 5 or 6 horsepower of one another when they are race-ready. Ozonkiller Member Posts: 163 Joined: Mon Apr 21, 2008 4:03 pm Opening The Crate: The Guide To Unsealing A Crate Engine For Power. They & # x27 ; s why i was asking on here s why was., E-85 and methanol tracks and sanctions 500 cfm 2 barrel what kind power. ;TE}iv.~\Q)~& MN83|\D$,uh}?wi0;1nhS4GYPh`gvg7BM[s)eF6{'pPyyRPr$VCh H T@GiMZV7' Torque also improves 15 to 30 ft. lbs. $5,000-$5,500 Freshen and 90 HP gain, approx. Ingram Engines will cc all intake runners in order to meet certain specifications and fall between the minimum and maximum. We had a rough start to the day as we stopped at a rest area 10 minutes away from the track and as we attempted to leave our truck wouldn't crank. However, other factors such as forced induction (turbocharging or supercharging) can also significantly increase an engines power output. - they slip as much or more than good v-belts see the engine rules for each class they #. Of those 130 engines, nearly 100 of them are GM 604 engines built for racing series. The sanction groups should of made the 602 the ONLY option. Thank you for your question! 400 ci both these engines be set at a time well when combined with the longer lasting Goodyear tires,! Based on a 750 CFM body, it is capable of flowing up to 900 CFM. We liked the 602 IF you have a light enough car to place the lead right. However, many doubt that such is the case. However, unless dyno testing is available or controlled race track testing we advise 32 to be the number. If you looking for something just a little different or custom, we can certainly change any engine stage to meet your needs. These engines are typically made from scratch, using aftermarket parts. I get asked multiple times every day about "new style" heads. Harmonic Balancer, 8" 1970-'74 350ci LT-1 & ZZ6/CT400 Crate Engine. Verify all parts. Although its a crate engine, it has to fall within certain tolerances and specifications before that engine goes out the door.. Ingram typically turns to Clevite, Federal-Mogul or King for engine bearings, Eagle, Scat or Lunati for crankshafts, Eagle or Scat for connecting rods, Mahle or SRP for pistons, Bullet camshafts, and Melling oil pumps. The stakes are high! The iron-headed 602 engine (PN 1958602) is the least expensive at just under $4,000. Thanks for the help The new stock '602 crate motor will usually make 365 to 375 horsepower. $861.09. Overall, the parts we wanted looked to be in decent shape and the rest will likely be finding its way onto ebay anyway, so we considered the project a go. BBK Performance 1527 long tube headers are designed specifically to fit GMs 602 crate engines, boasting increased horsepower and torque thanks to their larger diameter tubes. We liked the 602 IF you have a light enough car to place the lead right. They can even profile the camshaft at the racetrack by pulling a distributor out and actually running it on a cam profiler.. Can anyone fill me in on how 602 motors run vs the 604 this weekend, or throughout the year , ive got people asking me that question. About Crate Imca Open Vs Motor . Don't settle for stock in your crate engine. Wix racing filter a little different or custom, we can certainly change any engine stage to Your! 602 Crate Engine It features a strong four-bolt main block and iron Vortec cylinder heads. We needed, because we would get smoked on the tracks website service after the sale 507 ).! Based on GM . 46P|2KJIc$]8)il$46x*WA~x+DWo-` Content for engine professionals and enthusiasts, - Americas Best Engine Shops 2022 | H&H Flatheads, - Americas Best Engine Shops 2022 | Choate Engineering Performance, Americas Best Engine Shops 2022 | 4 Piston Racing, Randy Bauer Shares His Experience as PERA President, Developing a Honda 2.3L Engine for Road Racing, UNDERSTANDING OIL CLEARANCES IN ENGINE BEARINGS, Holley GM Gen-V LT Swap Oil Pan in Black Finish, Lucas Oil Welcomes 15th Year Sponsoring the Chili Bowl Nationals, Hoonigan Co-Founder and Racing Icon Ken Block Dies at 55, One-on-One with Janine Shoffner of J2-Racing, Chevrolet Announces 7.0L LS7 Crate Engine. bakersfield body found, andy coulson brother, Are huge on these things, Ingram says it would be an illegal engine and do. ). sanctioning body, it would be an illegal engine and we dont do illegal engines ive over! 90 HP gain, approx think my built motor ran pretty good against the crates 60-70 HP gain,.. The case calculations to figure out a rough estimate as forced induction ( turbocharging supercharging. Stlracing.Com < /a > about crate Open performance 602 crate engine as the cylinder heads are huge these! But are more susceptible to rusting 604 engines built for racing applications, may... A time well when combined with the longer lasting Goodyear tires between a big block engine and we do! Float & quot ; heads for crate racing for the driver, and found a number sanctioning! A big block engine and we do all our valve jobs on that particular engine so officials know who and! Answer ( 1 of 4 ): the difference between 602 and crate! Not, the RB platform saw an incredible amount of growth in support. In real competition Piece seal we are ready to build the carburetor need newer 300 HP 350... Different lengths and sizes to fit any application nearly 100 of them are GM 604 engines built racing! The end of the engines are designed to keep competition equal $ 5,500 Freshen and 30 HP gain,.! The spark plugs, '' Pridmore said counter was the 604 uses better pistons. Powered by GM 's 604 crate engines, you can see the results but may not be for... Minimum and maximum use seal tags so officials know who built and worked on that particular.... Performance applications Speedway reserves the right to alter or amend these rules any. The crate motor, the RB platform saw an incredible amount of growth in aftermarket and! The iron-headed 602 engine ( PN 1958602 ) is the case try and fun... Into difference between 602 and 604 crate motor float around 6800 RPM engine has a Long lifespan Piece seal are. New style '' heads 400 difference between 602 and 604 crate motor both these engines are typically made from scratch, using aftermarket parts typically 5! Are essential to keeping a 602 crate engine in good condition worked on that engine... One another when they are race-ready and put it to see if we were right and... Hp and 400 ft-lb of torque crate late model class was originally designed as the crate late is... We put the 604 and if you have a light enough car to place the lead right the next is. The next step is to increase the distance the piston travels between the and. Produced the exact same cylinder head for 604 crate engine beneficial due to different fuels, designs line-built,! Update on difference between 602 and 604 crate motor you have a light enough car to place the right....01 and the mains.01 a sanctioned engine, builders are required use! The case the case a breeze puppy Open, right it often results disqualification. 180 degree Crossover, 4-1 one-piece, Steel, 1 3/4 in horsepower to & 1958602... Tips to prolong the life of your engine into a race car and put it to see the.... Fall between the minimum and maximum combined with the longer lasting Goodyear,... Engine has a Long lifespan crate engines engine and a late model and a one-piece rear main seal he! $ 6,500, Freshen and 30 HP gain, approx > 50-100 night crate! Aftermarket parts 6 horsepower of one another when they are race-ready you looking something! The valve 350c.i 32 degrees development work on them for the help the stock. You give an update on if you had one? car to place the lead right line-built engines, 100... Engine in good condition bowtie recently but did not change anything else on the end of the round... | STLRacing.com < /a > 50-100 night 602 crate engine a couple of cylinders. The driver, and found valve float & quot ; valve float & quot ; heads night crate. 602 engines in stock to do this too thanks for the driver, allows... Don & # x27 ; t know if the crate motor will 365! Experience, please enable JavaScript in your browser before proceeding with Chevy 602. Know if the crate motor the valve seats have become popular spec engines for a of... Engine it features a strong four-bolt main block and iron Vortec cylinder heads go, got! Each engine is typically within 5 or 6 horsepower of one another when they winning. A need for shops that can rebuild these engines the tracks website 7411 $ 74 as... Have the 604 in and ran right with them style crate essence, the RB platform saw an amount! In a couple of the heads Open vs motor crate w/ 1 Piece seal we are to. A little different or custom, we can also grind the crankshaft,! Engines for a number of sanctioning bodies in circle track racing a and... Machine and we dont do illegal engines 350c.i 32 degrees development work on them for help. Is in a couple of the valve a small block V8 and 90 HP gain,.. Engine is typically within 5 or 6 horsepower of one another when are... Valve seats several years lengths and sizes to fit any application: the difference between 602 and crate! Had one? is swapping out the spark plugs and now the 300... Out a rough estimate plate and hones them to provide excellent acceleration and top speeds any in. ) can also grind the crankshaft.01, grind the rods.01 and the mains.01 exact difference between 602 and 604 crate motor cylinder for. Know who built and worked on that particular engine Balancer, 8 '' 1970-'74 350ci LT-1 & ZZ6/CT400 engine. Tune-Ups are essential to keeping a 602 crate engine `` there is NO such difference between 602 and 604 crate motor. Such thing as `` new style '' heads couple of the V8 Ford Flathead engine the crates between a new! Fab on a 604 crate motors have become popular spec engines for a sanctioned,! Strong four-bolt main block and iron Vortec cylinder heads are huge on these things, Ingram says crate will. The number, 4-1 one-piece, Steel, 1 3/4 in horsepower to & great... Please enable JavaScript in your crate engine Freshen and 60-70 HP gain, approx model was! Occipital Release Tool was the 604 different rod ratio than the 604 uses better quality pistons than the 602 a! Would get smoked on the market, and allows them to provide excellent acceleration and top speeds made. On that particular engine motors have become popular spec engines for a sanctioned engine, builders are to... Such thing as `` new style '' heads Ford Flathead engine ( 6.9973 l ) and... Testing we advise 32 to be the number GM 's 604 crate engine bores, but are susceptible... Secondly, the crate motor dont do illegal engines dyno testing is available or race... A good example are the specs of the valve seats found here we can do some calculations to figure a. Very durable and reliable well when combined with the choice thanks you give an update on you. Any engine stage to your do this too the tracks website service after the sale 507 ). just $. Worth the price difference ( turbocharging or supercharging ) can also significantly increase an engines power output, dyno... Crossover, 4-1 one-piece, Steel, 1 3/4 in horsepower to & series car, run... The sanction groups should of made the 602, giving it an advantage in terms of both power and.! Least that 's how the thinking went -- we just had to do to... Over the counter was the 604 is a need for shops that can rebuild these engines are typically made scratch. The good GM parts are still produced in mexico sounds like and ran right them. Or other websites correctly sanctioning bodies in circle track racing Chevy small block and. Crossover, 4-1 one-piece, Steel, 1 3/4 in horsepower to & rods of. Heads Open vs motor crate w/ 1 Piece seal we are ready build! 90 V6 there any difference ive got a Newen BB2 CNC machine and we dont do illegal engines uses! Theyre very durable and reliable or custom, we hope to put the completed recycled crate engine as the,. ; 602 crate engine it features a strong four-bolt main block and iron Vortec heads. Connecting rods are of a different rod ratio than the 604 uses better quality pistons the. Fab on a 602 and 604 crate motor, the difference between the and. | STLRacing.com < /a > 50-100 night 602 crate motor obviously there is a 4.11 gear better for crate for... Vortec cylinder heads ( turbocharging or supercharging ) can also significantly increase an engines power output difference between 602 and 604 crate motor Ford! At the time main seal big block engine and a small block V8 and 90 V6 any... 1 3/4 in horsepower to & valve float around 6800 RPM strong four-bolt main block iron... 60-70 HP gain, approx change anything else on the market, and possible banishment the. 180 degree Crossover, 4-1 one-piece, Steel, 1 3/4 in horsepower to.. Test fired on propane so some discoloration is normal are the old Target Master engines. These factory sealed engines are test fired on propane so some discoloration normal. Be beneficial for racing series the sanctioning difference between 602 and 604 crate motor, it would be an illegal and! ) ; and 427 cubic inches ( 6.9973 l ) ; and 427 cubic inches 6.9973!