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Old 02-20-2012, 06:58 PM
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400 sbc swap ?'s

Hey guys new to the forum but figured its just as good of a place to ask ?'s as any here's my situation i have a 85 Chevy 3/4 ton 2 wheel drive with a 4 speed granny transmission. i was wanting to swap the 350 in the truck for a 400 sbc 2 bolt main i have was going to rebuilt it and was wandering where i could find a standard trans flywheel for it first of all and upon the reassembling the short block i was going to keep it stock with the exception of this cam and lifter combo http://www.compperformancegroupstore...y_Code=HFTX4X4
i was also wandering what head and intake combo would u guys recommend i have a new 750 Holley double pumper and am looking for power and torque from 500-5000 rmp. any suggestions and advise would be appreciated. Sorry no pics

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Old 02-21-2012, 07:39 AM
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Quote:
Originally Posted by TheChevy181818
Hey guys new to the forum but figured its just as good of a place to ask ?'s as any here's my situation i have a 85 Chevy 3/4 ton 2 wheel drive with a 4 speed granny transmission. i was wanting to swap the 350 in the truck for a 400 sbc 2 bolt main i have was going to rebuilt it and was wandering where i could find a standard trans flywheel for it first of all and upon the reassembling the short block i was going to keep it stock with the exception of this cam and lifter combo http://www.compperformancegroupstore...y_Code=HFTX4X4
i was also wandering what head and intake combo would u guys recommend i have a new 750 Holley double pumper and am looking for power and torque from 500-5000 rmp. any suggestions and advise would be appreciated. Sorry no pics
Summit, Jegs, etc. all carry the correct flywheel for the externally balanced SBC 400.

That cam will be very strong down low. Because it has the intake valve closing relatively early, the static compression needs to be carefully chosen in order to keep the dynamic CR from being too high for pump gas.

For the heads, an intake port volume of 180-ish cc will work well for this engine and cam combo in your truck. Chamber volume of 64cc and a piston D-cup dish of 21cc like the SRP p/n 139625 will put the SCR at about 9.8:1 and the SCR at about 8.4:1 w/a o.041" quench and 5.7" rods.

If you're keeping the original pistons you will need a much larger chamber than 64cc. RHS and others have heads w/72cc chambers that might work for you, but you'll need to see what the dish volume of the stock pistons is to tell exactly what's going on. This will also mean you'll need a thinner head gasket than 0.041" to keep any semblance of quench.

An Edelbrock RPM would be a good choice for an intake IMO.
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Old 02-23-2012, 07:35 PM
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thank man was also wandering how it would turn out keeping everthing stock exept 4 the cam lifter combo and a small aluminum weiland hi rise intake i have with a rebuilt quadrajet carb keeping the stock bottom end heads
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