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Old 03-09-2012, 07:08 AM
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pontiac 455

Is a pontiac 455 internally balanced or external ? putting in a 4 speed-posi

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Old 03-09-2012, 07:19 AM
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Sorry, couldn' resist... All in fun.

The front "half" of the rotating mass is "internally balanced" (no changes outside the main bulkheads). There IS a slight imbalance in the rear, about 6"-oz. The flexplate has a series of holes all the way around. To one "side', there's an "extra" set of 4 holes, about 1" in diameter, not "reflected" on the opposite side. That's the "change" to bring it "in".

A balance shop can duplicate this imbalance on your flywheel without having to "rebalance" the engine. If a "stock" flywheel and unmodified, it's probably okay "as is", but I would have it checked to be certain.

This applies to all the later Pontiac V8s except the 265/301.

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Old 03-09-2012, 06:22 PM
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What is a 4 speed posi?
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