According to the CP website, 91CC on a zero deck shortblock is 9.3 compression. That's about what I have, with 70CC heads and 20CC dished pistons.
If you don't degree the cam with a degree kit, you don't really know where you are. +4 on the timing chain gear isn't always really +4. You can still be way off in the weeds with cam timing.
What are your ignition timing settings? What carb, intake, etc?
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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