[Dick Boneske]

Has anyone tried the Kauffmann intake with Rochester Tri-Power carbs?

We put end carbs from a '66 Tri-Power on the intake that have the venturi's bored to 1.410", which is about .100 larger than the stock 1.310" factory size. We put .080" jets in the end carbs to compensate for the larger venturi size.

The center carb is a 2G similar to the 1971 Bonneville 455 carb with 1.375" venturi's. We jetted that to .070".

The engine is 461 cu in with extensively ported #64 iron heads., 9.5:1 compression.. Trans is a Muncie four speed. Due to the fairly radical Crower #60353 solid lifter cam, with .533/.555 lift, 256/265 degree duration at .050" lift and 108 degree centerline, we made extensive mods to the idle tubes, bypass restrictors, and weakened the power valve spring due to low vacuum.

Idle is decent at about 950 rpm, wide open throttle is awesome, but at light throttle in any gear around 2000-2500 rpm, there is severe bucking.

Looking for suggestions on how to eliminate the bucking.