These forged 3-7/8" big bore pistons convert HD^® Twin Cam^® 88^® and Twin Cam 88B^® engines 95", and are compatible with stock or S&S^® Super Stock^® cylinder heads in. A 5.3cc pop up dome provides a slight compression increase. Piston weight is virtually identical to that of stock pistons in 88" motors, so rebalancing the stock flywheels is not necessary. +.005" bore.