I just picked up 2 340hp/454's...with a Mer Cooling enclosed water system. Got them at a decent price...came with BW trannies too.
Anyone familiar with these engines?

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Basically, they're pretty much built like a Merc 330hp 454 only the 340hp version were fitted for inboard or V-drive type applications---like a cruiser type of boat. They made about 10hp more because there isn't as many 90* angles in the V-drive system set-up as compared to a sterndrive/outdrive system such as like a Bravo One.

What kind of info you exactly looking for G?

Is one engine reverse rotation? They are standard for IB power with the velvet drives.
I need a couple velvet drives with around 2.5:1 reduction, if you want to get rid of the trannys.
Gary

Oh yeah, Kaama has it right. It's the same as the 7.4 or 330 motor. Peanut port heads, cast crank, etc.
Gary