Re: Head differences
If it was piston noise why is it only on the drivers side left rear corner. Piston slap can be heard when it's cold not when it's fully warmed up like both of mine did. Piston slap was from when cold and the piston was at the bottom of the stroke. Because the piston is smaller at the top around the rings the skirt was hanging out the bottom of the cyl the biggest part of the piston. Beside piston noise gets worst fast.
Is it a block problem for it too be only the left rear corner I think not. Poeple with high boost would been having lots of block problems.
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