FormulaZR

iTrader: (7)

This winter (assuming I still have funds) it's going to be time to pull the 383 LS1 out of my jet boat for a freshening. It's not hurt, it's just time. That said, while it's out I have every intention of putting an 8-71 with intercooler (either from BDS or The Blower Shop) on it. I know it won't make as much power as a turbo or twin screw build...but it'll look and sound awesome - and that's good enough for me. Actually, it'll probably wind up looking a little bit like WALL-E, but it'll have blower surge!

The goal will be approx 800 flywheel horsepower, and it will likely have the **** beat out of it just like my 383 did.

Questions:
1) Do I reuse my 383 with a piston/cam change? This would be the cheapest...but unsure about longevity.
2) Do I use a 6.0 iron block with the 383's current crank/rod combo for a 408? If so, do I keep the cathedral port heads - or go to rectangle port (blower intake is available for both).
3) Do I use one of the alum blocks I haven't listed yet (LS2, LS3, L92)? If so...can I still reuse my crank (24x reluctor)/rods from the 383?
4) Will the MSD 6010 have enough "*** in it's pants" for this?

I'm not going to say this is a budget build, because I do want it built right. BUT, it's certainly not an unlimited funds build either. Again, the goal is 800 hp...but 750 would be fine, as would 950. I am also going to be using carbs with this, because EFI with a blower is $$$ I won't be able to come up with.

DavidBoren

I, personally, do not trust boosted LS1/6 blocks. But that's just me. An iron 408 would probably be the best approach for having an engine that could be expected to last a while and achieving your goals. I would step up to rectangle port heads, because I believe that positive displacement blowers enjoy large volume runners. An aluminum block would be fine as well, so long as it is not an LS1/6 block. The LS2, LS3, L92 blocks all have thicker cylinder sleeves that can handle boost without slitting.

chuntington101

Is there any point in running an intercooler with a carb roots blower? Is the fuel not just going to evaporate in the supercharger and bring IATs down low anyway?

IronBlocked

sell the alum block to a road race driver or someone who needs it, you need a 388/403 iron warrior

LLLosingit

iTrader: (4)

I'm sitting on a pile off parts that was a roots blown 408, I bought it after it blew up on the dyno and the original owner decided to go BBC instead . Here is his original thread https://ls1tech.com/forums/forced-in...wer-build.html
I'm rebuilding it to put into a 1950 Chevy 5-window truck. I have everything to put it back together but have another build to finish first. The only thing I'm changing is going to pinned billet mains, Mainly because I had to replace the main caps anyway and I came across a deal on the billet caps. The other thing I'm looking at is a crank support, The blower pulley really hangs out there on the crankshaft and with as much money as I have in it now I might as well do everything I can to make it reliable.

Here is a video of his obviously before it was hurt on the dyno.

LLLosingit

iTrader: (4)

If you want to build one that will handle anything you might want to try to find out what the burnout guys are building lol they torture them.