On Fri, 28 Mar 2014 19:38:45 -0700 (PDT), Tim wrote:

On Saturday, August 14, 1999 12:00:00 AM UTC-7, JamesGang wrote:
Some of the older merc magnums had them. They used to be more common in small blocks but
truth is that any small block with less than 400hp doesn't need 4 bolt mains. And my own
truck gas engine experience has been that you'll see 50 thrown rods and broken pistons for
every broken crank or main cap.

I agree with the rest of the post though. You're better off with the 350 than the 305.

john sipkens wrote:

I have never seen a 4 bolt main yet in common marine engine, OMC, Mrec, Volvo?

--

Lifespeed wrote in message ...
In a *quality* marine engine, they use a steel crank, 4-bolt
main caps, and forged pistons. This is not to say that you
will find these desirable items in every marine/auto engine.
The head gaskets are more corrosion resistant also.

None of the differences are critical, if you don't use the
engine hard, or run in salt water. If you do either, then
you want the sturdier components.

350 to 305? Didn't you notice you're going the wrong
direction? No, you won't notice any improvement in fuel
economy. I'll give you one guess what you *will* notice,
tho.

FWIW, the "targetmaster" is the el cheapo GM replacement. I
wouldn't buy one.

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Agreed. I have a 305 in my '77 Marquis. It's turning into a nice boat, that is, when i get the interior finished. But if I have problems with the stock 305, I'll put a 350 in it's place. A lot better power per fuel usage.

The 350 did a good job of pushing that 21' Proline across the water! My SIL had a v6 in his
Chapparal 24'er, and it pushed that boat nicely also. Might be something to consider if you don't
need a lot of speed.