Aluminum 427 shelby blocks

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#1 (permalink)

05-30-2007, 10:58 AM

PJ10

CC Member

Join Date: May 2007

Cobra Make, Engine:

Posts: 19

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Aluminum 427 shelby blocks

Anyone hear of people having problems with the Shelby aluminum blocks 'shifting' after warming up? I am new to this forum and am trying to confirm/deny this. I heard that due to the type of alloy that is being used, the block expands under temperature and changes the valve backlash adjustment. Because of this, they are recommending hydraulic lifters. Anyone know anything about this?

Thanks

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