[Diy_efi] vortec engine piston noise?

[Tom Sharpe]

On Tue, 21 May 2002 23:49:18 -0400, Shannen Durphey <shannen at grolen.com> 
wrote :

The short skirt hypereutectic slugs gm used made a ton of noise.
> 
Hypereutectic pistons require less clearance because they expand less --- 
wonder if GM forgot to tighten up the clearances. Last year we rebuilt 
a '67 L88 427 BBC. You could still see the original hone marks in the 
cylinders @ 40K miles and get a .016 feeler gauge in the bore with the 
piston - they don't bend much either. The bore measured about +.010.  I 
also have an old HP 2 bolt BBC block that measures about the same... and 
those old forged pistons make a lot of noise until they are properly warmed 
up....  TomS

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