I agree with Duttweiler
"it's all in the tune."
All flow/burn issues aside, a flat top typically has the top ring land very close to the chamber and will most likely fail sooner with the higher temps.
__________________
'04 IS300 LS3/TR6060 swap in process
'89 Plymouth Colt GT - 411WHP, 2490lbs & 32mpg
'06 Magnum SRT8 - AFE S2, 3" Flowmaster catback, Diablo Predator (KIA by a drunk driver 10-25-13)
63 Nova 'Low Budget G-Machine' *SOLD*
|