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#11
08-26-2011, 05:59 PM
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Similar problem on a 9.5:1 455 Tripower engine in a '64 GTO. Cam is a little more radical than the RAIV--110 degree overlap. Fresh rings, valve grind, etc. Tripower is a stock '65 setup with .064 jets in center carb, .070 jets in end carbs. Idle mixture screws give max. idle rpm at 1 3/4 turns out. Idle speed about 800 rpm. Very good throttle response and power.
But, at a steady 1500-2000 rpm in 3rd or 4th gear, it bucks fairly badly. This makes city driving uncomfortable. Today, we lowered the spring pressure on the power valve rod by removing 13 coils off a 33 coil spring. Bucking problem is better, but still there a little as described.
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BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan |
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