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As mentioned above. The details of tune-up, temp, cooling, timing, plugs can help. But if have cast iron cylinder heads and you're at a compression ratio of > 10:1, and a cylinder cranking pressure of > 165 psi., there is probably not simple fix
Okay. Good info.
I'm not sure what a 4k deck height is. Do you mean 0.004" below the deck? Four shallow valve notches?
If so, you are approaching 11:1 compression ratio with iron heads. Will you be running pump gas? The typical J11Y - J14Y will be too hot. Probably NGKR5670-7. This is...
Funny stuff. There are all kinds of suggestion, but we have no information from the OP to even speculate as to what might be a good plug.
I'll assume a big block based on his "bb" statement. Is it a 440? There was no 915 head in 68. So is it a 68 head, or a 915 head? What is the...
Just getting down into the weeds. What is the length you used for 36°? And are you sure you have the "zero" mark on the tab?
A picture would be helpful.
I think its worth the effort to make sure this was all done right before we start pulling the entire engine inside-out.