[1969GPSJ]

So until I get aluminum heads for my 428 (16 casting, 72 cc, big valve, screw in stud heads), I have been considering using thicker Cometic head gaskets with my stock cast iron heads. Specifically I am looking at the 4.16 bore 0.080 or 0.098 gaskets. With the .080 compressed thickness gaskets, my static compression ratio would be around 10.06:1, with the 0.098, it would be around 9.70. Just trying to get the engine into the pump gas friendly zone to allow me to enjoy the car while I am getting another engine ready.


1) How does using a thicker head gasket affect engine operation outside of the obvious effect on the compression ratio?
2) What do you think the positive effects of the thicker gaskets would be?
3) What do you think the negative effects would be?
4) Which would be a better choice for my iron head - mostly stock fuel injected 1969 4 speed GP?



When I get the 72 cc aluminum D ports and a typical 0.041 gasket, compression would be 10.96:1 - should be pump gas friendly for aluminum heads.