Originally Posted by 86cj74.2L
I think the thicker gaskets are to keep the CR from increasing with a overbore.
If its anything like the saturn's there should be a few different brands of gaskets of varying thickness. If you shop around.
I do wish I would have gone up to 10:1 on the Satty.
Felt relatively good enough at first to do some simple calculations.
Difference in both scr and dcr in a calculator between 3.75 and 3.78 in a stock with no other differences 258 is 258.11/4.23/9.17:scr/7.38dcr and .0398 quench stock, 262.26/4.3/9.3:1scf/7.48:1dcr and same quench.
Stock with a .045 head gasket is 8.8:1scr, 7.09:1dcr and 0.598 quench.
30 over is 8.92scr and 7.19dcr and same quench.
I don't think the little increase in cr is gonna make it ping but I can't see the lower cr and bigger quench as anything but detrimental to performance.
OEM .025 compressed metal gasket and .047 felpro mls.
At one point mopar performance made a somewhat thin head gasket but they discontinued them a long time ago and I'd rather not rely on a head gasket that would be hard to find a replacement for.
Even the people that stroke 4.0's complain about the head gaskets and how the thinnest made is .041 or so even with a bigger market for 4.0's.
Either the enginetech specs are wrong or my manuals are.
.022-23 difference in height verified between multiple new and old pistons, not .015 which is the difference is when you use info from the manufacture website and oem specs in a couple different calculators.
Which is why I have to double check everything myself which is such a pain with these stupid headaches.
Not sure if I need this oil hole or not.