i haven't seen faster cars with stock heads compared to e-heads
unless you are talking some serious $$ poured into the stock type of heads vs a stock e-head, maybe you have a case
a draw back to e-heads is you have to watch your piston to valve clearance
but i'd gather even with a stock head setup for performance you will have the same issues
weight savings alone on the e-heads are something to consider too
little better cooling, etc
there are pros and cons pending how you look at em
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