WHAT KIND OF DISTRIBUTOR ARE YOU RUNNING. I KNOW STOCK HEI'S START TO PETER OUT AROUND 4 TO 4500. ALSO , IF YOU'RE NOT GETTING A FULL 12V TO THE HEI, IT WON'T PERFORM AS WELL AS IT SHOULD.
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GM 330HP/350, Magnuson 122HH, Tremec TKO 5spd
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