[Lynn Eades]

The C81T heads are "handed" left (6049) and right (6050) These are for pre 42 engines.
while the later C7RA heads fit on either side. The early heads fit the early blocks, but need to be relieved at the valve chamber to fit on the later blocks.(the valve line was moved up hill in the 42 engines)
The C7RA heads come in either Iron or Aluminium. The Ali is higher compression than the cast. Both types of C7RA heads are Higher comp. than the C81T heads.
The manifold required has the facility to fit two sets of 3 carb mounting studs.
on its carb mounting face.