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Quote:

Originally Posted by phragle (Post 4672102)

If your running a 24/7 in lake erie...weight is not your enemy.

Think my setup is around 3000-3500lbs as it sits I haven't weighed it yet, and yes lake Erie will be the majority of my boating. I can see how weight would help to a point. Either way I thought it would be neat to see an older boat like mine with a Ls swap especially because its kind of a newer generation thing. Then all the old die hard bbc guys could see the new with the old. Really just a good conversation piece while having some soda pops on a beach if anything.

Quote:

Originally Posted by Wildman_grafix (Post 4672117)

You painted the intake gasket surface or am I missing something?

Yes. It will seal fine. Have done this several times. These engines use orings to seal

Quote:

Originally Posted by MILD THUNDER (Post 4672012)

I noticed you said you were replacing blown bbc engines that were burning 110gph EACH. Im hoping these were making at least 1000hp each neighborhood ?

I do understand some engine designs are more fuel efficient than others, but at some point it still takes x amount of fuel to make x amount of hp.

in the truck world, when the LS was an option along side the 8.1L bbc engine, the fuel savings were not all that impressive in my opinion. If you took a mid 2000s chevy 3500 dually 4x4 , with a 4.10 rear, and towed a boat, its not like the 8.1 got 8mpg while the 6.0 liter ls was getting 16mpg towing the same load. There was a small fuel mileage gain with the 6 liter, but it also didnt make nearly the torque the 8.1 liter did, nor did it make that torque at such a low rpm as the 8.1 liter did.

Ive had a few tow rigs . A 6 liter ford diesel, 5.4 gas ford, v10 gas ford, and 454 vortec chevy. They all got in the 8-10mpg range towing a heavy boat. My theory is it simply requires x amount of fuel to keep a truck/boat going at 70mph, and theres only so much fat to trim to get it done.

I dont buy the story that a 600hp LS is gonna be a huge game changer for your wallet at the gas pump over a similarly equipped bbc making 600hp.

That being said, looking forward to the results. Always fun to see something different being built.

When comparing na to na I would say by the example you set of the 8.1, which my brother owns currently, or my old 6.0 the 8.1 got 7-8 mpg towing my boat while my 6.0 got 10-11. So just for argument sake, on the street 2-3 mpg is miniscule. But on a boat that 20% difference, especially on a boat at the rate that fuel is condumed compared to the street is huge. Then throw twins into the mix and its a clear win win. But going to how I was comparing my blower motors (870hp @ 5800) to now smsllblock na engines the difference is astronomical. I wont miss the few hundred hp. Lol. Well I will but reality is that kinda power in my daytona was rarely used to full push. My pocket book will never miss them. Look up some dyno sheets with bsfc and just do the math. There really is a significant difference when comparing similar hp ls to bbc

Quote:

Originally Posted by mggdoors (Post 4672239)

Look up some dyno sheets with bsfc and just do the math. There really is a significant difference when comparing similar hp ls to bbc

that was why i was asking about how much power your blower motors were making that were consuming 110gph worth of fuel. At only 870hp, that BSFC number would be off the chart .

Theres alot of NA bbc engines being built today, that have great cylinder heads, proper camshafts, induction etc, that net sub .500 brake specifics. Of course if some slapped together old turd with a pig rich carb on top , and an overall poor combo, then yes it will be a guzzler.

Quote:

Originally Posted by MILD THUNDER (Post 4672346)

My quick in the he head math of 110 was wrong. My bsfc was. .63x which equates out to around 90. Keep in mind I ran an annular carb which does tend to burn more fuel in the higher rpms. Still a d**k ton of fuel. A good bsfc on an ls is .39-.43. My combo may or may not reack that as I feel my exhaust will hurt me until next season when I go to headers. The dyno will tell the tale soon. Fabbing brackets and modifying harness as we speak.

Nice. I can’t decide to paint my engine or leave bare aluminum. But, that looks very nice.

Quote:

Originally Posted by Hot Rod 29 (Post 4672890)

Nice. I can’t decide to paint my engine or leave bare aluminum. But, that looks very nice.

Thanks. For me it was easy. I used iron blocks. My gto has an aluminum block and I swear it attracts grime so never again with straight aluminum.

https://cimg8.ibsrv.net/gimg/www.off...b3d8c912e.jpegA little more engine porn. Just sprayed exhaust.