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1974 Chevy Corvette compression

Tiny
REKLAW_MIT
  • MEMBER
  • 1974 CHEVROLET CORVETTE
  • V8
  • 2WD
  • AUTOMATIC
  • 3,000 MILES
I have a 383 Stroker with dart ss heads and a mild cam. It recently started missing and backfiring. I pulled the plugs and noticed they had oil all over them. I did a cylinder compression test and the readings were cyl.1-115 psi, cyl.3-110 psi, cyl.5-115, cyl.7-90, cyl.2-60, cyl.4-65, cyl.6-80, cyl.8-90. I pulled a valve spring off to check the valve seals and when I did the spring dampener broke. The heads have teflon seals. What all do you think is wrong and what do I need to do to fix it? Any ideas will be greatly appreciated.
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Sunday, October 17th, 2010 AT 11:28 AM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be rings and cylinder wear, camshaft wiped out and timing chain off a tooth or so
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Monday, October 18th, 2010 AT 4:55 AM
Tiny
REKLAW_MIT
  • MEMBER
  • 2 POSTS
Is there another way to check the rings besides a compression test? The motor is suppose to be a new crate motor would they already be bad thanks
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Monday, October 18th, 2010 AT 5:55 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do a cylinder leakage test-if the air pressure is coming out of the oil dipstick its confirmed that is leaking thru there
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Monday, October 18th, 2010 AT 5:24 PM

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