[Thor1993]

Hi Guys,
Well I thought I better do some testing before I invest the time and money into a new exhaust manifold. So tonight I did a compression test. The motor was warm but not hot like the manual says but I ran one anyways. The results are cylinder #1, 2, 3, 5 & 6 were all 90-120psi on the first stroke with most about 110psi and 160-175psi on the 5th stroke. Cylinder # 4 was 75-80psi on the first stroke and 150-155psi on the fifth stroke. I put some oil in cylinder # 4 and re re-ran the test and it was 120 on the first stroke and 200psi on the fifth stroke. Spec is all psi readings within 20psi. So for a truck with 180,000 miles not too bad. I wish #4 was alittle better.
Next I am going to pull the valve covers and make sure the cam and valve train is working. If not I can do the exhaust manifold and other repair all at once.
Also, the plugs are AC Delco and the wires said "Standard 7mm". What do you guys think of Standard spark plug wires??
Take Care and THANKS FOR POSTING!!!,
Greg