WHAT IS MY MARINIZATION?
Click on the small pictures
to see the big ones
2 raised ribs
indicates a standard 351, 250HP with hardened exhaust seats.
A flat head,
with no raised ribs, indicates a older style without hardened seats,
requiring Valve Tech or a lead substitute.
Flat Head and
2-rib heads are compatible, just make sure both take 14mm plugs.
Indmar
454
PCM 454
Mercruiser Mag MPI
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