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Prevo,
I did a leakdown test on the suspect cylinder and two others. There was very, very minimal leakdown. I put 100psi into the cylinders on a cold engine and leakdown was less than 5%.
The AFR heads I have on it only have about 5k miles on them so I certainly hope I don't have a guide problem....the oil drainback holes in them aren't great though...oil does tend to pool in the valvetrain up top due to their location. These valve seals only have about 1200 miles on them though....so I"m thinking maybe a defect seal that wasn't caught during installation?
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1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
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