some time ago I started a face lift on my sedan delivery ive have removed a 350 and am installing a 502 blown with 2 holleys using a small distributer . I am trying to figure out how far forward the engine will have to be moved for valve cover clearance with out shoehorning this any more times than possible any help out there this evening
Last edited by FAT ASS 55; 02-21-2018 at 07:24 PM.
Welcome aboard Fat A$$! Post some pics.
Welcome to the site. Usually 1.5" forward will give you enough room to clear a stock firewall with no modifications. As you move the engine forward, you begin to introduce other problems like drag link to oilpan clearance issues and possible clearance issues in front of the engine.
56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension
Other vehicles:
56 Chevy 2-door BelAir sedan
56 Chevy 210 4-door sedan
57 Chevy 210 4-door sedan
1962 327/340HP Corvette
1961 Willys CJ3B Jeep
2001 Porsche Boxster S
2003 Chevy Silverado 2500 HD Duramax
2019 GMC Sierra Denali Duramax
Agreed with above, however is a 502 a tall deck, if so if you intend to run taller than valve covers I would go with Ecklers 2.25 forward kit. I run a tunnel ram on a 408 BBC and appreciated the extra room for carbs and air cleaners.
A 502 is not a tall deck block. If you're running a blower you could have other issues with it hitting the top of the cowl. If it was me, I'd drop the engine in and see where it sits the best, then build the mounts.
56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension
Other vehicles:
56 Chevy 2-door BelAir sedan
56 Chevy 210 4-door sedan
57 Chevy 210 4-door sedan
1962 327/340HP Corvette
1961 Willys CJ3B Jeep
2001 Porsche Boxster S
2003 Chevy Silverado 2500 HD Duramax
2019 GMC Sierra Denali Duramax
Originally Posted by markm
Ding Ding Ding - nope!
Stock Chevrolet V-8 Block Heights
Displacement Cubic Inches Liters Deck Height (inches) 302 4.9 9.025 305 5.0 9.025 327 5.4 9.025 350 5.7 9.025 350(LT5) 5.7 9.025 350(LS1) 5.7 9.240 364(LQ4) 6.0 9.240 383 6.3 9.025 400 6.6 9.025 396 6.5 9.800 402 6.6 9.800 427 7.0 9.800 454 7.4 9.800 502 8.2 9.800
question NCW, isn't a 383 a 350 block (.30 over) with a 400 crank? Why would it have a deck height different from a 350? What am I missing? Also, isn't there a tall deck 427, generally a truck block? Dick
Last edited by TrifiveRichard; 02-22-2018 at 10:23 AM. Reason: update
You can build a 383 two ways, the way you described, or by using a 400 block with a 350 crank and boring it .060 over.
Last edited by Bitchin'57; 02-22-2018 at 10:40 AM.
I believe the 400 bore (4.125) and 350 stroke (3.48) results in 373 cu in, close but has different performance characteristics. This generally results in a higher RPM (horsepower) motor, but typically less torque throughout the range, all else equal.
Of course all the 'std' passenger car big blocks have a taller deck than the 'small blocks'!
All of the 'big blocks' you posted/listed are so-called short deck (big) blocks; IIRC, there ARE big block configurations (for large trucks I think?) which have a taller than 9.8" deck... I believe that is what CN was referring to... ?
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