330 Express RePower

“Also, how come the 6 cylinder 350's are a non starter for you?”

Displacement and torque

Yamaha 350
4.3L v-6
5.3L V-8 (no longer being made)

Mercury 350
5.7L V-10


The Mercury is lighter than the Honda v-8, with more displacement and torque

Some guys are going Honda because they had a crazy deal of $10k off msrp

that sounds like desperation on Honda’s part…similar to what bombardier did with the Etec did before they discontinued it
 
I’d like to know what they did to increase the hp rating on this hull. I’ve been very deep in the bilge in my ‘04 and it’s already got steel beams triangulated and connected to the transom. It looks like they just increased the max hp on paper as higher hp engines became available.

Anyway… for a 700hp rated boat my only choice would be Honda. V8’s and much cheaper than anything else. For newer boats, it’s the v10 Merc for me. For my era boat, I went with v8 300’s. Partly because that’s max rating for my hull and I’m a rule follower and partly because the the only 350’s available at the time were 6cyl which are a non starter for me. I’m a v8 guy.
Other than cost, why would you choose the Honda v-8 350 over a Mercury v-10 350 on a boat rated for 700hp? The Honda is a heavier engine with less displacement