Can't find this info. I have a head, which was resurfaced, but not sure how many times. Are there specs anywhere, how high / thick should be the head originally?

 

By other words: how do I calculate how thick the head gasket should I use, if I don't have info about the head resurface?

 

No one, huh? Either way, I figured myself. First of all, I measured the volume of combustion chamber by putting white spirit into it (with leveled upside down head):


It took about 33 cc. I've adjusted it to 33.1 by using https://www.mopar1.us/compression.html and plugging all known OEM numbers into it. I measured the diameter and depth of dished area on OEM pistons, got ~55 mm x ~0.7 mm, i.e. 1.663 cc volume. Piston deck clearance was also measured right on the engine, got ~3.6 mm


Then, I've adjusted the parameters to my new numbers: bore 77.5, HG bore 78.5 and HG thickness 0.9144 (for Cometic Gasket Automotive C4308-036), not dished pistons (Wiseco) . And I am getting just very slightly higher CR (~8.4):

Meaning, I really need the thicker 0.036" (0.91 mm) HG (vs standard 0.65 mm one) for my build.

 

i did not realize you could calculate hg thickness in this way. are you going for stock CR?

 

Yes. All I need is stock CR. Basically, just fixing the motor (with more reliable parts), rather than modifying it for higher perf.

 

i'm with that. going for reliability. these cars are plenty fast, stock

 

Check manufacturer specs or forums; someone might have the dimensions!