What is prompting the builds? Did you lose one or both? I'm holding off on props as I mentioned earlier. Bob put a 4 BBL carb he had laying around and made another 15 HP, so we know the throttle body is choking the engine some. BBlades thought I should wait until I do that, then probably jump up to a 25p and lab that. So far I've got a max of 72. One of the engines is giving me an alarm at WOT so I've not been doing any hard running besides long cruises until I scan it. Which she's done great on, I've kept the stock oil pan because it seems to be working great. Ran 3500-4k RPM from Clear Lake TX to Galveston, TX and my oil temps were perfect. If I wanted to lab what I have, they think there is a few MPH there. But, really...I'm just loving the acceleration and having a great running boat again so it's not high on my list right now. I forget who programmed it, I could dig it up when you're getting closer.

See post #22. Bob added oil coolers. A must IMO if doing this build and keeping the stock pans.

Just want to run faster. I'm a little bored with running 65-70mph. The plan was to sell off stock engines and start from scratch with Dart blocks stroked to 406. Simple additions like dart aluminum heads, a mild custom cam, aftermarket intake, headers, pump gas compression and I'm thinking around 450hp each motor. I would like to keep the fuel injection so I'd have to research a tuner. Would like the computer tuned while under a load versus sending away computer for tune. Would like to see 80mph plus on a light load

If I were in your position I'd sell your stock engines and buy one of these bad ass big block setups I see for sale. You'd spend similar money. If not that, I'd sell them and do an LSx build.

I love my engines but I only did the build because I had to rebuild them either way and this build wasn't a ton more.

I can't do big blocks because they are a different size and won't line up with the existing transom setup. I am going to try a reputable engine builder that can do the builds and tune. This way it's turn key ready with what I hope are no issues.

Where are you at? If you do dry headers you will hit 450 easily with my build. We held back a lot on the cam and if you do throttle bodies you might even do better.

I would really read over the Skater LSx build if I were you. That thing is nuts.

Hey guys, I just dyno'd a small block for a 68 Camaro. It was a 427, dart block with dart 200 cc heads, 10:1 compression and a pretty big hydraulic roller cam, single 4 bbl carb.. It made over 600 HP at 6200 RPM. I was really impressed with the numbers. You could build a similar marine version that would easily make well over 500 HP in full trim.

Dart/AFR406
 

The attached build sheet is for a marine Dart SHP 406 w/ AFR 195 cc heads with a mild hydraulic roller. This went into a Magnum Starfire ~ 5 seasons ago. A very tractable, durable piece.

Bob

Can you send me the link for that skater build? I never heard of a LS1 in marine application. At this point, I'm doing research and trying to educate myself. What I'm looking for is an 80mph boat on a light load. If you use the 11hp equals 1 mph gauge, I figure I can attain that goal with a 450hp setup. I'm a cruiser type of guy who likes to cruise at around 40-50mph, but every once in a while I like to open it up. Reliability is the most important factor in any build because there is really no point of doing anything if you are going to be broke down often or doing frequent tear downs. Plus, if I can get by with my bravo 1 setup, that's money in my pocket as well.

What was the cost of something like that, injected or Carbureated and if injected, what kind of delivery system? Whichever route I go, Id want the combo tuned while in the boat