103" Big bore Wiseco flat top standard piston kit has a compression of 9.6:1 with 3-7/8" bore. Kit includes top end gasket set and pistons that are Armor X coated. Kit includes Armor X coated pistons.Note:Run engine at moderate speeds for at least 500 miles, avoiding excessive running in lower gears, in order to properly break-in new pistons and rings. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Engines & Engine Parts\Other Engines & Engine Parts". The seller is "americanclassicmotors" and is located in this country: US. This item can be shipped worldwide.