Old unit must be crack free and serviceable-built up with valves etc. Must be a 998cc casting CAM4810 or 12A1456 with flat manifold facewith transmitter hole. .
Completely rebuilt in the UK by top engine reconditioner Ivor Searle who used to recon all Unipart engines, set up for unleaded fuel with hardened valve seats and completely assembled with valves and springs.
Head has a refundable surcharge added of £300 if old unit not exchanged
See part number
MSSK061 for replacement stud kit for thermostat housing etc