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Forum: General Q & A

02-28-2007, 11:50 AM

Replies: 9

Prochargers and blown head gaskets?

Views: 4,427

Posted By daqcraig

Compression ratio

These are Mercruiser 7.4 L MPI Gen VI. Compression is listed as 8:1.

Does that change your opinion about the pistons and valves?

They say this motor will take on 5 PSI boost with no...

Forum: General Q & A

02-28-2007, 08:48 AM

Replies: 9

Prochargers and blown head gaskets?

Views: 4,427

Posted By daqcraig

Prochargers and blown head gaskets?

I have a 98 Baja 342 with twin 7.4L MPIs. Hours are 220. This boat will go 58mph at about 4200 RPM with 3 blade 23 pitch mirages.

I am told these motors are relatively low compression and good...

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