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Old 09-28-2011, 05:09 PM
cris well cris well is offline
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SBC 383 with 64cc Vortec heads and flat-tops

I'm thinking about buying an 84 C-10 SWB with a 383 and a turbo 350 trans and a 3.42 rear end.

He told me that he used flat tops and 64cc RHS Pro-Torker Vortec heads with 1.94's and 1.50's. He said the compression is 10.5 to 1 but that seems low to me with this combo.

I'm thinking it would be closer to 11 or 11.5 to 1 without knowing the deck height and overbore. It has an Isky flat hydraulic cam with 236 duration. I looked it up and it's an oval track cam with a range of about 3000-7000 rpms.

He said it runs on 92 octane pump gas.

My question is did he have to set the timing really low to avoid detonation therefore cutting the power way down?

Thanks
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