Should Cosworth Pistons come level to the top of the block or above?

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Sep 30, 2008 | 12:05 PM

2ndGear

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Should Cosworth Pistons come level to the top of the block or above?

Mate of mine is rebuilding his cosworth 4x4 motor. Got new pistons got them fitted but he says the pistons at TDC just come above the block? Is this normal i would have thought they should be completely level.

Sep 30, 2008 | 12:08 PM

JamesH

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Normal, a few thou only though I think, something like 20thou is the limit? May be wrong?

Sep 30, 2008 | 12:09 PM

Chip

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they are supposed to protrude past the top of the block, it gives better squish properties than having them down the bore.

Jul 4, 2012 | 04:59 PM

boy-racer-1

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From: England

sorry to dig up an old thread but ive got the same question, my pistons are 0.4mm above the top of the block, is that a safe amount when using a standard head gasket does anyone know?