I read some threads about what the compression should be on a 302 ,but I don't have the original 30-30 cam. I have a ccxs282s. Anyway I did a compression test because I had a full throttle episode and then it ran a little rough. I freaked out but was relieved when I took off a valve cover and found I pulled two rocker studs and didn't damage anything. However, My compression was 210-230 on every cylinder and I thought that was a little high.
Were the studs partially pulled? or pulled totally out? Did it damage your valve covers? When I bought my '69, back in '76, one of the valve covers had been cracked (and welded) as had the head... due to a stud being pulled out..
PS. I'm unaware of any engine problem that would make all the cylinders exhibit consistent 'high' compressions.. :)
I'd think your engine is OK with those numbers; 210-230 is 5%...
No, partially pulled out. In fact I couldn't tell at first and tried to lash them down with no success. Then I measured them. No damage and I sure got lucky. Apparently my cam doesn't bleed off pressure like the original.
Did you pin the studs after you found this?
No, I'm putting in the screw in ones that look like originals.
I used to have 250 on a 350 with 11:1 pistons and 64 cc heads - I don't remember what cc the 302s heads were. A 350 would have a little more compression with a comparable domed piston due to the stroke though.