I'm ordering custom pistons from Venolia, for my 1725. I plan to order them as 3.248 in dia, as this is a standard (82.5 cm) size and would then use readily available rings. One question Venolia has on their order form is "piston clearance". I was planning on having my machine shop set that clearance when they bore the block to match the new pistons - after I have the pistons in hand. But I was wondering where / how the clearance is normally achieved. Does the piston maker make the dia undersize by the clearance amount? Or does the block borer make the bore oversize by the clearance amount. It seems a moot point somewhat, since I plan to have the bore done AFTER the pistons are in hand, but I was unsure of what the normal expectation is.
My assumption is that I will tell Venolia to make the pistons exactly 3.248 in and the block machinist will set the clearance. Right?
Thanks ,
Tom
My assumption is that I will tell Venolia to make the pistons exactly 3.248 in and the block machinist will set the clearance. Right?
Thanks ,
Tom