z-ya Posted January 19, 2004 Share Posted January 19, 2004 I talked with my machinist last week, and he told me that only cylinder #1 was bored 0.5mm over. The rest are stock bore. Huh? Then I realized that when I pulled the motor appart, I only cleaned off the top of piston #1. This is where I saw a 0.5 clearly stamped on the top. I checked the rest of the pistons and the tops have nothing stamped on them. Must of been a dealer quick fix? The motor was rebuilt because it had a reground crank (0.25mm), and a FelPro head gasket. Lot's of silicone sealant used, so I don' think it was remanufactured. Anyway, I've decided to bore it 1mm over (all 6 cylinders ). I'll be running flat tops with an N47 head. Should make a nice street motor. Pete Quote Link to comment Share on other sites More sharing options...
Dan Baldwin Posted January 22, 2004 Share Posted January 22, 2004 Pretty funny! Actually, why NOT only overbore the cylinder that needs it if cost is an object? So if you do a 1mm overbore on all 6, won't you still have one that is .5mm bigger (1.5mm over total)? j.k. Quote Link to comment Share on other sites More sharing options...
z-ya Posted January 22, 2004 Author Share Posted January 22, 2004 Dan, I'm making them all the same bore (1mm over) wise guy I wonder how having one slightly heavier piston would effect engine balance? Pete Quote Link to comment Share on other sites More sharing options...
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