CRG Discussion Forum
Camaro Research Group Discussion => Maintenance => Topic started by: 68Zproject on May 21, 2012, 04:27:47 PM
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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.
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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%...
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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.
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Did you pin the studs after you found this?
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No, I'm putting in the screw in ones that look like originals.
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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.