Hey all, I am trying to figure out how much HP the 455 I am picking up should be making. As far as I can gather the 455's put out anywere from 370-250 HP. According from what I could read on the block and year one's pontiac engine I.D and codes I have an XA code from a 1973 which would be 250hp. If this is correct then that is disappointing. On the other hand the motor does have eidelbrock intake manifold, carb, K&N filter along with headers and exhaust.
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