Well I was originally going to go full motor build h/c/i/e then forge and add spray but i was never big on spray just kind of had that thought process. I am very new to this but am hoping to learn, i have done some research but not a ton of it. I have an LS1 with 77k miles and was wondering i plan on gettin it forged so new rods and pistons and etc, is the mileage going to matter after all that is redone or should it be like new?? (seems dumb but just checkin, will be having a shop do it obviously).

Goals are ~800 rwhp so was thinkin it will be forged 346 so a PT88mm would be ideal for that hp goal. It is an M6 so it will be easier and I could probably hit it with a 76 but I think i will eventually swap over to a 4L80E for track use so might as well make sure I keep it. It will also more then likely be running a meth kit as it's fairly cheap and a safe route to go. I will be doing full suspension before I get to this so that will be no biggy and already have clutch and things.

Time for you to critique my possible build and the most questions:
-Forged 346
-6.0L heads (i've read about these for turbo builds, not sure if it has to be on a certain block or if there were just a certain way to make them fit).
-I currently have a 230/238 .610 113 lsa, i have read about turbo cams and this one has a little too much degree of overlap but wondering if it could hurt to keep in until i can afford a new one?? I was going to put the turbo in and keep boost low until i could forge motor and when I forge it I would change cam.
-LS6 vs Victor Junior intake / what TB to match?? I'm not knowledgable about Vic Jr. intake thought it was more for carb'd motors.
-Motron 60 lb injectors.

I know this is a lot to read just thought i'd try and get as much out now as I could, all constructive criticism is appreciated please go easy though!! haha.

 

My advice is until you can afford to forge the motor and do a proper fuel system you shouldn't run a 88 on a stock LS1. It's honestly cheaper to buy a new shortblock than have a local shop rebuild yours. I already blew up my 6 speed and put a TH400 in my car. If I hadn't I would have sold the motor and tranny as a package. As it is I just sold my LS2 longblock. Since you are talking turbo you could sell your ls1 and 6 speed and go the TH400 route. Put some 2.73 or 3.07 gears in there and your cruising rpm isn't that bad.

 

Did you look at the thread i made?? Maybe this will help or put on see-saw on what turbo to use!! LOL!!

https://ls1tech.com/forums/forced-in...whp-range.html

 

I'm really not that big of a TH-400 fan honestly, i'd like to hold on to my M6 until she blows up on me. How could it be cheaper to have a new block built then to have mine rebuilt?? THey will already have the block and put the new parts in as opposed to having to buy the block and replacing all the parts anyway.... it would be more expensive?? The fuel system would be upgraded as the turbo goes in just not the internals which is why i wouldn't run like any boost so it wouldn't do damage.

Yes CamaroCoby I did see your thread and this is almost a replica of it, i have gotten a lot of information from it. Do your 6.0L manifolds just go on to your LS1 really easy, haven't seen 6.0L things on a 5.7 before haha.

 

Im using the c6/6.0 truck manifolds to keep the a/c. Yes they go in fairly easy because they mount the opposite way (driver on the pass./pass on the driver side).

 

ahhh okay i'll have to look into the 6.0 truck manifolds then, i dont really care about the a/c but i'm sure they are fairly cheap and if they work good that's better

 

If you dont care about the a/c then just get the 6.0 truck manifolds. You can find those just about anywhere. Check the junkyards.

 

Haha alrighty that works. How about the vic jr intake/elbow?/ Is that a goood item to use for my setup lookin for 800 or so rwhp. It seemed fairly cheap $430 shipped and finding some cheap used 6.0L truck manifolds. I would just have to swap cams and sell my exhaust for a turbo exhaust.

Anything i really need to look for in motor damage when gettin it rebuilt?? I figure a good shop will clean it up, rehoned, forged pistons, rods, etc. So is there anything that wouldn't keep it from being like new??

 

The vic jr setup would be overkill IMO. You could make 800 on a ls6 and be done with it. The vic jr doesnt work until up top. i would use the block and crank that you already have, put a good set a rods, and find some forged pistons that would put you compression ratio in the 9.2:1 range with the heads your gonna use.

They arent talking about a d-1 but you pretty much can get the idea:

https://ls1tech.com/forums/forced-in...ic-jr-ls6.html

 

yeah i was reading that but i thought it was for s/c so i wasn't sure if it was the same. Oh well good the LS6 will work on my car i can find that cheap. Any particular TB for the LS6 or just a LS2?? Yeah thats the idea keep block and crank and get new rods and pistons. Think 9.2:1 is low enough?? I thought optimal is 8.5:1??

Also i was lookin at doing some 317 6.0L heads as well as the manifolds. Do they fit up just regularly like any other head or do i need something differnt?? Is there a difference in compression between the LQ4 and LQ9 317 aluminum heads. I have seen someone speculate there was and the newer 317's are higher compression!!

 

i think if you run the lower compression (dished) piston you can run any heads you want. I think most guys switched to 317's to lower the compression instead of going in the motor and changing the pistons to lower compression. so i think its an either or deal and not both.

some of the real high power cars run AFR and TFS heads because they lower the CR with the pistons.

 

AT 800rwhp might want to do a 6.0 iron block build. Use crank,and get rods and pistons and sell off your ls1.As said if you get forged pistons not going to worry about compression ratio from the heads as much. Guys buy thicker deck heads to keep head gaskets from blowing mainly.
Also 800rwhp you need 80 pound high impedence or could go to 96pound low. Higher still if you want to run the car on e85. You need serious fuel setup for 800rwhp like twin pump, big lines, rails,boost referenced reg.
I am running 60s for temp use at low boost. I have some low impedence 120s here to go to or will go to 80 high imp ones if sell off the 120s.

 

Thanks for the info guys. Well I can't really spend the $$ on some nice AFR's or TFS that's why I was thinkin 317's might be able to help do the trick for awhile. The deck i heard she be able to hold it pretty decently as long as the tune is good. I like my LS1 and was trying to stick with it as long as i could, also wanted to stay away from ehavy iron blocks. Yeah i know my fuel setup will have to be crazy i plan on twin pumps and big lines. This will be a big build eventually but on fairly cheap parts until i can upgrade haha. Thanks for the input guys, anything else to consider??

 

So what kind of throttle body do you guys pair up to your LS6?? Do you just get the stock LS1 TB ported and polished or LS2 or anything else?? I might have a trade my t56 for a th400 so someone one that argument, what size converter would you all recommend going with so that there won't be constant overheating on the street but still great track use???