PY Online Forums - Bringing the Pontiac Hobby Together - View Single Post - Best cast iron heads for 428 street build

Stan Weiss · 04-17-2021, 02:32 PM

DCR can help BUT the old GIGO comes into play.

Let look at a Pontiac 455 ci engine. It will have 175 psi cranking compression / 7.3:1 DCR

So how can I get there

8.5:1 / IVC 56 ABDC

9.5:1 / IVC 71 ABDC

10.5:1 / IVC 81 ABDC

11.5:1 / IVC 88 ABDC

12.5:1 / IVC 94 ABDC

Do you think because they all have the same DCR they will run the same?

Stan