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 ParklandAutoMachine.com R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648 Parkland Auto Machine
Thank you Scotty for the info!
From what I've read, it seems like the PI heads and intake would be best for street application for stock to a mild build. Is that not the case? Are the D0VE heads and intake the better choice? I'm looking for some "bolt on performance" until I get a different project completed and can tear down this 460.
What is the end goal?
Inexpensive rebuild... use what you got or can get cheaply... either casting leaves alot to be desired. If the pistons are reused, the D3's are probably less expensive.
Have some extra free time... porting either OE casting will significantly improve performance.
Want less weight... go aluminum (they usually flow better too).
But if you want a monster... pull out the credit card and stroke it add some P51's and an 871 on top. That would be some serious bolt on performance. 😁