Re: broken top compression ring

Posted by Ross On 2013/10/16 5:37:42

I find this very often on these long stroke engines. Just want to underline that the new rings need to fit with proper side clearance in the grooves. Chances are your top ring grooves are all noodled out and you will not get a satisfactory job unless you recut them and install a shim.

If you have a lot of bellmouth you will need to rebore for a good job. But even .010 will be ok for a drive-around-for-fun car as long as you can get a good fit of the rings into the piston and they aren't flopping around in the grooves.

I have had excellent results using Grant piston rings. Their oil control even on worn cylinders is very pleasing.