60916 >>> INT/EXH - Dur @ .050” Lift: 221°/229° RR: 1.5/1.5 Gross Lift: .455”/.470” LSA: 112°
I agree with others, advance the cam to 108/109 centerline. try a smaller intake like the performer to increase port velocity.
you need to make sure the torque convert and gear is correct for the setup. that engine should want to rev.
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1979 Firebird Trans Am 301/4spd (Now 428)
1977 Firebird Formula 400/Auto
2007 Grand Prix GXP 5.3L
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