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Engine Gallery

WHAT IS MY MARINIZATION?

Click on the thumbnails for full-size images.

Pleasurecraft Marine (PCM) Ford 1986 Commander 351  1985 Commander 351 FWC Escort 302 
 Indmar Ford  1994 PCM 351 PTI  PCM GT40 MPI Bobtail  Indmar GM Carbureted
 PCM 454 1995 Indmar LT1  Indmar 454  1996 Indmar Monsoon I 
2000 Indmar LTR   2004 Marine Power 335 2006 Indmar MCX  Mercruiser Mag MPI
     

351 Ford High Output (H.O.) Cylinder Head

Indicated by 3 raised ribs on the end of the head.

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.