Dome top pistons in a 427 Big Block Chevrolet engine with Closed Chamber Heads will generally provide compression ratios of 10.0 to 10.3:1 which makes them a good option for any engine that needs a moderate increase in compression, and larger than stock camshafts. Valve reliefs are configured to work with most types of standard and aluminum cylinder heads and will normally fit camshafts to well over .600 valve lift. 18 degree pistons are also available.
