compression check
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2nd Gear member
Joined: Mar 2008
Posts: 722
From: Hermiston Oregon
compression check
my car 350 with a 350 th, rebuilt about 15yrs ago, fuilee heads, Z28 intake mainifold,quadrejet carb 4b,
i need to know what my compression should be and how do i do it.
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Joined: Apr 2008
Posts: 15
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RE: compression check
1. Get a compression check kit, like this
2. Remove all spark plugs
3. Screw the fitting into a spark plug hole
4. Have a helper crank the engine 3-4 times
5. Write down highest reading
6. Repeat for each cylinder
7. Profit
Your readings should be consistant with each other,a "bad" reading would be one cylinder 30-40 psi lower than the rest.
Look for an average of between 120-160 psi. It varies with the engine.
2. Remove all spark plugs
3. Screw the fitting into a spark plug hole
4. Have a helper crank the engine 3-4 times
5. Write down highest reading
6. Repeat for each cylinder
7. Profit
Your readings should be consistant with each other,a "bad" reading would be one cylinder 30-40 psi lower than the rest.
Look for an average of between 120-160 psi. It varies with the engine.
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