You know what is really boils down to I built it. I stated it. I missed my mark. I still posted it knowing I would get ****. Ran it again made some gains. Missed. Still posted. The point is I had the balls to do it. I gave it a shot. I showed the public exact results with stock ls3 heads. Ive never been anti big block I had them. Been there. Done that. No hatred. Just trying something different. We are all boaters here. What or who am I hurting by posting some data. Im not the guy who beats up or bad mouths people on here. I try to inspire them. I owned up to my end. I always will. Btw I really would call my engines built but you choose what they are.

Just sayin. He made it sound like a pretty much stock motor with ported heads. This is exactly why I prefer conversation face to face. Too much misinterpretation

dyno with everything but wet exhaust. Blew up crank water pump on the dyno as a matter of fact. Figured it was more important to me to get egt data for tuning. You can see in the video I posted two thing. One the accessories where on the motor minus the sea pump and two the thing went crazy lean initially with the 1050. Being corrected as we speak with new carbs that Patrick at pro systems is kindly trading out

Thank you. Like I said in an earlier post I will update at end of season when cnc heads go on the motor. Again. For comparison sake.

most of the runs are with it. We blew the rear seal after the bearing locked up. Had to remove it. I have like 15 pulls. Ill find out how much it pulled for hp

sorry for the delay. Offshore internet is being extra ****ty. These are stock GM 502s. They have cams and box stock EQ iron heads. 8.7:1 compression which also contributes to the bsfcs being higher than normal. The plan is for blowers but still scared to pop the bravos. That dyno number is with wet exhaust and not even a set of long tubes like the 525. These cams desperately want longer runners. I’m too poor for that. Lol

for the record I’m a fan of the LS platform and think you made great power for what an LS is. I only take issue with the claim it would make a 525 look like a fool through the whole powerband and I don’t see where you beat the 525 at all. You make peak power a little higher but a fraction of the torque. This is no ball busting on the LS or what power it made just against the claims made.

You also mention there aren’t many LS powered stern drive boats yet claim they’re cheaper and better. If that were the case don’t you think there would be more than 20 of them?

Probably going to get **** for this but I can say from personal experience that the bravo will be fine. I ran bravo on both the sunny and currently on the daytona (same drives even) behind blower motors. Take off nice and dont murder the throttle below 3k. If you think your coming out of the water then get out of the gas. Ive had better luck with bravos then xr any day. And if you do have an issue much cheaper and easier to find parts for. Keep the oil changed( I do it every 10 hours with the engine oil). Might sound excessive but oil is cheaper than mechanical. Last but not least drive shower, preferably wag engineering billet cap. If it breaks it will most likeley be the floor. Easy fix. I have two spare bravos sitting still waiting for failure. Keep in mind mine are behind a cat with 5 blades. Very hard on drives but still ticking. Btw my drives on my daytona are 1994.
Are you running the eq 320? Thats what I ran on the blower motors. Good heads but heaaaavvvvyyy

I havent found but a 4 hp variable on any run. Some of it has to be the pump but not every run is identical either

Yes EQ 320s. Trust me I want nothing to do with XRs. So far my combo has lived for 70hours. I do engines and drives every 25 hrs.

i weighed my mpi gen+ 350’s vs my new LS3’s and I’m saving nearly 400 lb each. That’s SBC vs LS.

LS3 is aluminum block right? We are comparing iron blocks here

excel?

These are starting to show up more in some I/O apps but are expensive. Drop in ready price shipped to your door with CMI e-top type headers are 24k.

The nice thing about them is the service life. The Air boat guys have been using them and beating the **** out of them. Seems the top ends last about 1300-1500 hours and then close to 2800-3000 is rebuild time.

LSA 6.2L 556HP V8 Marine Power USA

https://cimg1.ibsrv.net/gimg/www.off...353be6e715.png

correct but they have a marine version and a car version. I haven’t been able to find out the difference other then valves. The one thing I haven’t checked is if you can purchase the marine version from a GM performance dealer.

I was told marine power will be coming out with the LT4 SC direct injected version soon. The guy I talked with said GM is doing the cert testing for them this summer. Should be around 650ish HP

but they want $24,000 for the 550, hate to see how much the LT4 would be.

Another question is what kind of buss system to they have.

true. And that was with everything drop in, just add tails. I do like the service intervals. That and I would gain 6” between my motors.

The big advantage is truly the new ls engines lt series gen 5 (newer than mine) with the direct injection and variable cam timing. Would need to upgrade fuel system and use a standalone but more torque and hp everywhere than mine. No carb option though. One of you asked about the internals on the crate engines. I actually spoke to marine power about there line of engine when ordering exhaust and they are stock crate engines with inconel exhaust. Plus all the fancy brackets and so on. Nothing special. Keep an eye out on the new l8t 6.6l coming out in the new silverados. That will be my next project build when I get hand on a couple but need to wait for them to come out and get totalled first. The heads on the new gen engines are amazing. I urge you to look at the l96 vs the l8t comparison for tq vs hp. The vvt definitley makes a nice difference with a much smaller cam needed.

Looks like excel maybe. Should have done a hp one too. Even better would be a comparison of common engines such as 496ho, hp500, 525efi, and 525sc. That would be cool to see

And this is why I questioned dyno accuracy when comparing my run to the 525sc that was run. The 525sc sheet I posted was well below those numbers with the same cam. But to be fair I have no clue to what heads where on it

Im talking about the 525sc dyno sheet i posted. I have no clue what heads were on those engines as they were a customers of my dyno shops

Heres some NA pump gas big blocks, boats and street rods.

https://cimg4.ibsrv.net/gimg/www.off...2e31cb04d6.png

That looks like connect the dots lol.

I literally asked them about this. For instance on the ls3 I asked if it was forged internals. He said no it was a gm crate that is marinized via inconel exhaust valves, which the l96 already came with anyways. I think that statement about not for marine use is more of a warranty disclaimer, just as say a zz454 or any other street crate application might say the same.