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ChrisBennet ChrisBennet is offline
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Join Date: Aug 2001
Location: Nashua, NH USA
Posts: 8,089
I was talking about deck height with Steve Weiner once and he advised me to try to keep the deck height between 35 and 40 thousandths(.040"=1.0mm). I was talking with him in the context of a 3.2->3.4 conversion so this may not be applicable. I think the last two motors I did had deck heights of ~1.2mm (964) and .98 (3.2SS).

If you haven't decked your spigots yet that will raise the compression a little. It's my understand that decreasing the deck height around the edge of the piston into the 1mm range will actually reduce the tendency to knock even though it's raising the compression. Something to do with reducing the volume of the "pocket" out at the edge the piston.

'80 911 Nogaro blue Phoenix!
'07 BMW 328i Coupe
Old 06-04-2005, 04:12 PM
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