Cam timing would have to be retarded 40-50 degs for exhaust valves to crash the pistons with that tiny cam.
Valves would have to be damn near fully open, it's virtually impossible for all exhaust valves to be crashing.
I had a Comp 294S installed 4*’s out and the intake valve were so close they didn’t allow the carbon to settle on the pistons. My bad, misread the marks on the gear.
