|Big Block Chrysler cylinder heads come in two basic configurations, closed chamber and open chamber. Closed chamber heads were used in all engines
dated 1967 and earlier and possess a 78.5cc combustion chamber. Open chamber heads were used from 1968 onwards and have 88cc combustion
chambers. All JE 400/440 Wedge pistons, both domed and flat tops, are designed to accommodate either cylinder head type.
REMEMBER; check all clearances during assembly as shown in the diagrams and notes below. If you have questions regarding the head chamber details
on your particular cylinder head JE suggests that you contact the cylinder head manufacturer directly.