[Stan Weiss]

Originally Posted by Tom Vaught

You crepe up on the canyon ledge. One step away from going over the edge.
(Factory Pistons to zero offset pistons.)

Now you reverse the factory offset pistons in the bores and you are over the edge and bad things will happen on a engine. the offset is now more that a neutral position.

You get away with ZERO OFFSET, you have issues with NEGATIVE OFFSET.

You went too far by installing pistons in a engine that was never designed by the piston manufacturer or the GM Engineer to run with in the Pontiac Block. What MIGHT work in a drag engine does not work in a street driven car or a road race car engine.

Somewhat like installing a camshaft one tooth off from a proper setting. It will run but not well or how the engine was designed by the Engine Engineer.

Simple Stan.

TV

Tom,
So then why did the OEM's on their top of the line Hi-Performance engines that they still had a warranty on use non offset pistons?

Stan

[Tom Vaught]

Originally Posted by Stan Weiss

Tom,
So then why did the OEM's on their top of the line Hi-Performance engines that they still had a warranty on use non offset pistons?

Stan

Post up examples of GM Non Offset Pontiac Pistons.
Since this is a Pontiac Site the Pontiac Pistons will do fine, Stan.

Tom V.

Example TRW supplied Offset RA-IV Pistons as a OEM Supplier.
Still have the Specs from Dennis Novotny (a TRW Piston Engineer there)
RIP Dennis.

Tom V.

[Stan Weiss]

Originally Posted by Tom Vaught

Post up examples of GM Non Offset Pontiac Pistons.
Since this is a Pontiac Site the Pontiac Pistons will do fine, Stan.

Tom V.

Example TRW supplied Offset RA-IV Pistons as a OEM Supplier.
Still have the Specs from Dennis Novotny (a TRW Piston Engineer there)
RIP Dennis.

Tom V.

Tom,
I am sure someone will correct me if I have this wrong. The information I have says the 455 SD had pistons with no offset.

Stan