Join Date: Jul 2006
Location: Northfield, Illinois
They should know that Jim. Venolia has made Alfa pistons for a LONG time. Call yours STANDARD unless you have had machine work done to block and liners. Stock compression is listed in some sources as 9.7 for Veloce engines. HOWEVER this varried slightly when new, and more now as previous owners have probably milled your head at rebuild time. The only way to note this is to measure head thickness, or CC combustion chambers with comparison source data. Most builders ordering stock replacement cast pistons today go with 9.1 (normale) pistons, as actual compression may be higher from previous mill cuts.
Best is DIY compression ratio calculation done by CC'ing your chambers with your Venolia pistons, then maching crowns (metal removal) to arrive at a chosen ratio.
One word here. Do NOT further mill your 750 head (or 101-1300;101-1600;105-1750 or any race or modified head) as they are getting scarce. Ruin one and you will regret it. There are better ways to get them flat, or change compression.
My opinion only from my own experience.
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