Originally Posted by wydopnthrtl
Bob Bob Bob.. you just won't quite will ya.
Anytime you have forged pistons and a low viscosity oil you will have piston slap. My 5.4L *ford* as produced from the factory had audible piston slap starting at 1000miles. It's normal and it's simple science of how the grain structure in a piston effects it's growth with heat.
And I'll add this too. All engines have piston slap. You just can't hear it for the most part. The OEMs do little things to disguise it. Like I know for a fact that Ford machines the mod motor pistons in a not perfectly round shape. They machine it so that when it's up to temp it *is* perfectly round. They also add or remove material in the block to change the frequency so as to make it less audible to the customer.
Give it a rest..
Rich you never did answer my post regarding your "science" in getting around
the problems of the Cadillac Northstar!!! In this case, "popular perception"
The link I posted explains GM's piston slap!!! Just curious, what engines did you have to switch to straight 30W when piston slap developed?
If piston slap developed in the life of the engine, there was significant wear, which is expected from the abuse you give an engine!