IML: Sick 440!
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IML: Sick 440!



The other day, while starting my 69 Coronet, it backfired. The engine immediately had a noticeable "miss". A few days later I removed all spark plugs and did a compression test. The results were as follows:

Cyl 1 (engine cold): 0 psi
Cyl 3: 0 psi
Cyl 5: 30 psi
Cyl 7: 130 psi

Right bank Cyl's were all OK.

I removed the valve cover and cranked the engine. All rocker arms & pushrods seemed normal. Removed rocker arms & pushrods - all OK. Removed the cylinder head - cannot see any markings on gasket indicating a leak through between cylinders. Valves appear OK. Head appears OK. Have not yet checked valve seats. Looking at top of pistons with a strong light indicates they are OK.

After I check valve seats, I don't know what to do next. Would appreciate any comments or ideas from the group?

Thanks..........................James




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