When I bought the cool head I was only trying to keep the motor cooler.Added a billet propeller,inline ribbed adaptor thing, and engine ice.
Was told they were stock domes.Not really adding any compression.
I also have a 421 stroker but detonated the driverside piston.The motor will be down for awhile as I wanna go through it,install it then sell the motor Im currently running.But in the meantime I just wanna ride the smaller motor.
Again Thanks for the help