Originally Posted by fast68plymouth
Imo, for that application they’re already too big of a head.

I wouldn’t do anything to make the ports any bigger.


Yeah the ports already match the intake gasket so no reason to mess with it.

Steel shim HG and 65cc chambers should bump the CR up to 9:1 area, I'm a little concerned that the XE284 will make it a bit soft on the bottom, but the 270 is pretty low lift. Probably should spring for something in between, maybe the XE275HL. 231/237 .525 lift.

'65 Plymouth Sport Fury
Blow thru twin turbo coming soon...