MikeyGee87325

I have what seems to be no spark on cylinder 2 and 3. Ignition system is good, spark is getting to the cylinders. The carburetor is supplying fuel. Compression is listed above. The noisy head was before the new head was installed. Also, the valve clearances are supposed be set hot, however, for the purpose of heating it up we have adjusted (cold) intake to: .008 in. exhaust to: .010 in.

Quadruple checked the wires, everything is in it's right place. Moved the spark plugs to different cylinders, 2 and 3 are still not alive. Compression test: Cyl 1: 95 psi Cyl 2: 100 psi Cyl 3: 90 psi Cyl 4: 100 psi I know the cylinders are supposed to test between 115 and 180 psi, but also test within 5 (ish) psi of each other. I'm out of the 115-180 psi range, but within 5 psi of the other cylinders. As a side note, while the head was off the bottom end of the motor was spun over, by hand, a few times to inspect the cylinder walls, I did not notice anything abnormal at this time. Also, both the warped and 'new' head were at the machine shop. There, the 'new' head was tested and rebuilt.

Hokay so... My buddy acquired this truck a bit back, clutch had detonated (now fixed). It goes to portland, the head makes all kinds of noise, couldn't adjust the valves to kill the chatter. Soon after it became apparent the truck had 2 dead cylinders (2&3) with spark and fuel issues alleviated, and soon burning coolant we called it a head gasket we pulled the head it was cracked on all 4 cylinders between the intake and exhaust ports new head installed, ignition timing in, head and crank timing in, still has dead 2&3 my question is: what is the likelihood of those cylinders losing compression through the rings? Is this a common occurrence for a L20b with xxx,xxx miles on it? Is there a way to check this without re-removing the head? Brainstorm with me if you could please.