Yep, it’s an interference motor. In 85 I had rebuilt a 235. Got a bad timing gear set where the dots for tdc no. 6 were mismarked, badly mismarked. I was using a stock sealed power cam (which did not come with a cam card) and did not put a degree wheel on it to confirm the opening and closing events. Tried to fire that motor up and promptly bent all 6 intake valves. I keep the receipt to remind me of why I use degree wheel, even on my stock rebuilds.
