What kind of boat will this engine be going into (model and length)?
I am building it, here is a link, offshore deep vee performance boat plans
Here are the main stats:
- Length overall 30'-2"
- Length waterline 24'-8"
- Beam 8'-0"
- Hull draft 15 1/2"
- Displacement @ DWL 5350 lbs.
- Hull weight (approx.) 2700 lbs.
- Freeboard forward 3'-3"
- Freeboard aft 2'-10"
I plan to use it as a large day cruiser, as I do not live near the ocean. I am not out to break any speed records, but over 60 mph would be nice.
This post on PB shows my most of my progress this summer, Glen-L Bandido Build - Performance Boats Forums
Where will the boat be used (freshwater only, ocean, etc)?
Utah Lake. It's freshwater, but fairly shallow and silty. It's shallow enough that I gave up on my v-drive plans. Some years, due to water level, boats need to trim the drives up to get out of the harbor.
Must you use thru-transom exhaust or are OT headers okay?
I would prefer thru-transom on this style of boat, but I would not rule out OT headers. It could look very cool.
How much horsepower do you want?
Minimum octane requireement?
I see 400hp as the minimum. 500hp would be nice. 600hp on the high end.
The highest octane at the pump I can get is 91, because of elevation. 91 would be fine. I am unsure on a max rpm.
Due to the cold, I can't really progress on the hull. In the spring I will be doing the stringers, so I have to choose between one engine or two. I like the idea of a single very strong engine. A 460 or 521 coupled to an XR drive is what I am planning on. I have also thought of a Merc 496, but what fun would that be?