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The D0VE heads are a direct bolt on and will get static c/r close to 9 to 1 in an OEM 75 short block.
Best to go with roller rockers, studs and guide plates. The OEM rail rockers chew up valve stem tips even with an OEM cam.

The PI heads will bolt on but the intake valve is 2.19" and the diameter of the intake relief on oem pistons is not large enough radially if cam timing gets too aggressive.
In addition the PI heads have an 88 cc chamber which still leaves static c/r in the 8's.

Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
"Parkland Performance Auto Machine" Formerly RHP
Parkland Auto Machine
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