Home › Forum › Ask A Member › 1966 FD 20 troubles › Re: 1966 FD 20 troubles
Yes, built in the head gasket. You can see, even on the combustion side, where the bottom cylinder seems to be corroding more than the top cylinder around the cylinder bore. In my humble opinion, you have water intrusion there.
As Frank stated, there is likely more going on, but that is at least one of the issues of the poor running that will need to be rectified. Luckily, that is an easy fix, per se. It looks to me like the gasket is deteriorated around the bottom cylinder, but check the head to be straight as well. I sand and straighten every one I take off, just to be sure.
Hopefully your exhaust screws come out with ease! Removing the exhaust cover, and bypass covers, will allow you to check the rings for bounce, and for damage to the sidewall of the piston.
If you happen to have a new piston ring, you can drop it in the bore, and check the end gap. If the end gap is in speck, the bore is likely good. Red neck way to check a bore I know, but not all guys have bore gauges.