When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
pull the head, check to verify damage. I'd look at the pistons, verify the valve isn't bent, damage to the valve guide, and valve seat. A bent valve can seal and run but eventually the valve will fail. Better to check everything out up front than finding a motor. Pulling the head isn't a bad job.
I'd find a good local machine shop to check the heads. If you are in Atlanta, I have one.
Before I would start pulling heads I would check the piston and cylindr with a boreoscope. That will tell you if the piston hit the valve. You can pretty easily check that the valve isn't bent hne you change the spring. After that a compression test will tell if the valve is sealing properly.
Broken Valve Spring
pull the head, check to verify damage. I'd look at the pistons, verify the valve isn't bent, damage to the valve guide, and valve seat. A bent valve can seal and run but eventually the valve will fail. Better to check everything out up front than finding a motor. Pulling the head isn't a bad job.
