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Author Topic: compression  (Read 966 times)
68Zproject
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« on: May 21, 2012, 11:27:47 AM »

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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68Z28
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« Reply #1 on: May 21, 2012, 12:40:10 PM »

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..  Smiley
I'd think your engine is OK with those numbers; 210-230 is 5%...
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
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72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
68Zproject
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« Reply #2 on: May 22, 2012, 11:48:24 AM »

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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68Z28
tmodel66
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« Reply #3 on: May 22, 2012, 11:59:22 AM »

Did you pin the studs after you found this?
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Daniel  
'69 SS 350/4 speed  Fathom Green--POP
68Zproject
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« Reply #4 on: May 22, 2012, 07:02:11 PM »

No, I'm putting in the screw in ones that look like originals.
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68Z28
srode
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« Reply #5 on: May 22, 2012, 07:25:29 PM »

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. 
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Steve - 02D Z11 and a Plain Jane hardtop
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