C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Compression Test, What do you think?

Old Sep 20, 2008 | 09:57 PM
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Default Compression Test, What do you think?

I have an 87 L98. Completely stock with 58,XXX miles. I get a puff of smoke on startup, so I am thinking the valve seals are bad. Other than on startup, I do not get smoke at any other time. When I pulled the plugs, they all had some oil on them.

I performed a compression test and these were my results. Please tell me what all of you think. Thank you.

1 - 178
2 - 180
3 - 183
4 - 187 - highest
5 - 180
6 - 175 - lowest
7 - 184
8 - 177

Only about a 7% difference between the highest and lowest, so that seems fairly good to me. Any input is appreciated.
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Old Sep 20, 2008 | 10:18 PM
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Compression numbers are ok, as you thought you need valve seals.
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Old Sep 20, 2008 | 10:27 PM
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Originally Posted by ultraviolet70
Compression numbers are ok, as you thought you need valve seals.

Thanks for the input. I bought the seals. Just need to find the time.
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