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Old 04-08-2012, 12:15 PM
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Originally Posted by Jkingof956
am currently building a 454 bbc standard bore out of my 1990 454ss truck, and i would like to add a comp cams 268h cam i would like to know what pistons can i use to get the recommended compression ratio for the cam thanks in advance...

Mods: 454 bbc standard bore
stock cylinder heads casting numbers 14092360 2.06 intake and 1.77 exhaust open chamber oval port with 3 angle valve job
long tube headers
750 cfm carb
performer rpm intake
See post #2. The heads are nominally 118 cc, but you have to measure them to know if they've been milled excessively before committing to a specific dome volume.

That said, say the heads are 118 cc like they're supposed to be. To get the CR to 9.4:1 with an unmilled block and a HG thickness of 0.040", you'll need a dome volume of 23-24 cc. If you can get the quench down to ~0.040", the dome would then need to be about 18 cc. Changes to the CR from different volumes or CR targets can be easily made using a CR calculator.

I had a set of PP heads on a 454, ran fine w/3.31 rear gears in a '81 Camaro.

Last edited by cobalt327; 04-08-2012 at 12:31 PM.
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