Quote:
Originally posted by 68gt500
I put a set on my Shelby 4 weeks ago. I have driven it 800 miles since and had zero problems so far. The only thing I really did not notice was a substantial power increase.
It sounds a little different and revs a little higher but thats about it.
Fun as always, just donīt have to carry the lead supplement anymore. 
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Did you go from iron heads to aluminum ones without changing your pistons and/or compression ratio in some way.
Aluminum heads will actually produce less power due to the greater heat absorption of the heads as compared to iron heads.