Offshoreonly.com - 310hp or 330hp - Whats the difference.

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CB-BLR

06-16-2007 07:29 PM

310hp or 330hp - Whats the difference.

What is the difference between the 310hp and the 330hp 7.4's ?

Also, how can one tell the difference?

Different years?

Chris

David Stotz

06-17-2007 06:54 AM

At some point in time Merc switched the HP ratings from crankshaft to prop shaft. It could be the same motor, just rated in a different way.

Dave

Pat McPherson

06-17-2007 07:15 AM

The 330HP is a Gen IV (1990 and older) 454 carb and rated at the crank.
A 300HP 7.4L carb is a Gen V (1991-1995) and rated at the prop.
The 310HP 7.4MPI is a Gen VI (1996 and newer) with GM fuel injection, also rated at the prop.

CB-BLR

06-17-2007 12:33 PM

Thankyou Pat,

That was extremely helpful information.

Chris

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