Snapping sound under load.

[AzRay]

Originally Posted by Chippy Minton

It's a shame that you put in a different distributor cam and torqued the head at the same time as either could have solved the problem. Never mind tho it's running good.

Quite sure it wasn't the new distributor cam. The old one was fine. I checked points setting on each lobe. No difference. The model B cam simple has a slightly better dwell.