What could cause this? 360 problems ####update####

67Dart273 said
No that is not the problem. The correct answer is you need to get your tail in gear and degree the thing, and NOT depend on either the balancer mark or the timing marks

I've installed many a cam and timing chain and never degreed them. Lined up the dots and no problem. I'm not saying that it shouldn't be done it's I never had any problems with the valve's hitting the pistons and we installed performance cams the same way