TrickFlow 190 Issue

MOPAROFFICIAL said
The stud...
If he compared the two, stock head bolt vs stud.. there lies the cause. Studs have the threads machined out...so the shank is as big as the thread while a head bolt is shouldered but smaller in diameter above the threads.
Solution.....lathe/turn down the stud OR drill the head bolt hole on each .020 larger aka .040 larger bit.

I'd not turn the stud down, you'll surely lose strength. Clearance the head or use a good bolt. I dont follow the design comparison...they look similiar to me as both types are rolled threads from the same stock. The stud have a larger OD? Hard to tell in these 2 pics.