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Old 06-12-2014, 12:41 PM   #7
3rd Gear Member
Join Date: Nov 2013
Vehicle: 1965 shelby
Location: arizona
Posts: 518

if you have stock pistons the bigger valves in your new heads might hit the pistons.

if you have stock pistons the extra hp might break the pistons or the rod bolts.

can't have your cake and eat it too. going fast costs money. there is no such thing as cheap reliable hp.
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