The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - has any one ever seen a 90 over sbc piston?

PanelDeland · 08-27-2006, 08:46 PM

Usually only .060 over is recommended but that is due to casting shift.The mold used to cast the block shifts some when it is poured.The cylinder walls may be thinner on one side and not have enough material to bore more.The block can be sonic checked for cyl wall thickness.Some of the aftermarket blocks come with thicker cyl walls and can be bored much more.Another consideration is that the cyl wall needs to be thicker on the wall in direction of crank rotation.

08-27-2006, 08:46 PM	#5
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: has any one ever seen a 90 over sbc piston? Usually only .060 over is recommended but that is due to casting shift.The mold used to cast the block shifts some when it is poured.The cylinder walls may be thinner on one side and not have enough material to bore more.The block can be sonic checked for cyl wall thickness.Some of the aftermarket blocks come with thicker cyl walls and can be bored much more.Another consideration is that the cyl wall needs to be thicker on the wall in direction of crank rotation. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"