cobalt964

go get it. flat top pistons, aluminum block, and better rod bolts from the factory. good little motors.

Exidous

iTrader: (11)

Cool think is that block could be resleeved to take a 4.125" piston. BAM 427ci stupid scare teh crap out of you monster. A resleeve is about $2k if you already have the motor.

cobalt964

or a 383. ls1/ls6 pistons with stroker crank. but cost effective wise I think you could build a ls1 383 cheaper.

RonSSNova

iTrader: (3)

Well, too bad for the Porsche guys.
I am doing an L33 turbo setup in my Nova right now.
Really need to keep these a secret, I want another for a spare.....

cobalt964

I know what you mean about keeping them a secret.

cobalt964

you would not need the rotating assembly just the pistons. crank and rods are the same from 5.3 to 5.7 ls's. and building a ls1 or ls6 into a 383 is cheaper only by the bore cost, as you would be replacing the entire rotating assembly on either the l33 or the ls1/6 to make it a 383.

Verz

iTrader: (21)

Hmmm wonder what a fast and aftermarket cam would do. Wanna try to keep my swap to an alum motor if possible.

funnyscreenname

I'm really excited to see this. I've been working on swapping an LSx into my 93 RX7 and just recently decided to go 5.3. Last week I picked up an 07 L33 with 67k miles for $550. It came with stock bottom end, complete & stock 853 heads, ls2 cam installed, some cam from texas speed, comp dual valve springs, ported tb, and ls1 intake manifold. It doesn't have accessories and all so I've gotta find all that but I thought it was a great deal.

I know this engine came with the afm/vvt so I've gotta figure out what all to replace besides lifters and valley cover. I figured a set of LS7 lifters would be fine. I also need some pushrods and rockers. Not sure exactly which ones I need. I guess you went with oem?

Also I see you replaced the bearings and all. I was thinking of doing the same thing. It'll never get easier than now since the engines on the stand. Will new oem bearings hold up to alittle track time? I was really wondering if the oem water pump, oil pump, etc is the best to go with too.

As far as the 853 heads, I was thinking of trying to find some 243's or 799's but I might just go ahead and port these and use them. Not really sure yet. Trying to do everything on a budget to build a car that I can drive daily and also hit the track once in awhile without having to trailer the car to and from the track. I wanna be able to drive to and from the track, meets, and possibly rallies.

I'm new to the LS platform and some input from someone with as much experience as you would truly be appreciated.

Exidous

iTrader: (11)

Great price on an L33 you got there. 853's aren't terrible. I have a set of 241's sitting on my work bunch right now. Trying to decide if I was to use them or put some 317's on the motor.

cobalt964

853 was used on 99-00 LS1 engines.
they have a 66.67 cc combustion chamber (10.1 CR), 200cc intake runners, and 70cc (round) exhaust ports.

The 243/799 head is the LS6/LS2/L33 head.
It has a smaller 64.45cc chamber for more compression (10.5 CR on LS6), 210cc intake runners, and 75cc D-shaped exhaust ports.

both came with 2.00" intake valves, and 1.55" exhaust valves.

most will tell you stock 243's are 20whp bolt ons over stock 853's. but I agree with exidous, 853's aren't terrible.

Exidous

iTrader: (11)

I think they are 205 on the intake but with VERY minor porting can be made to be acceptable. Smoothing around the valve seat and the rocker bolt bump will make a good difference.

I was looking at my 241's and it's VERY obvious why they are SO much better ported. They look like they were very lazily assembled at the factory. Poor transition at the seat and all sorts of flashing and imperfections.

funnyscreenname

If I find some better 243's or 799's for a steal I definitely won't pass them up but for now I'm most likely gonna stick with the 853's and do some port work. I need to do some research and figure out which push rods to use and also see what lifter possibilities I've got. For now I'll most likely stick with the LS2 cam so I'm guessing some LS2 pushrods and lifters would suit the engine fine. I need to figure out which Texas Speed cam I've got and sell it to help fund the other parts.

garygnu

great build .a GM ASA cam would have made more power .

patman7800

I know the heads is supposed to be better then the LM7 and the cam is bigger with more compression. But I want to do the Ls2 cam with the LS6 intake just wondering if my heads are good enough

funnyscreenname

If you don't want them I'll take them : )

SNLPerformance

iTrader: (15)

799 heads flow just as good as the 243 heads just a different casting number in your case and with a 2.00 intake valve you really can't go bigger on the smaller 5.3 bore which is the real limitation of not making as much power as it's other LS brethren. You could get the heads ported if you wanted to make a little more power and I'd mill them some to bump compression if you did that, but an aftermarket cam would make similar gains and be cheaper.

OP sounds like you got a deal and a fun car with that power to weight ratio, we recently finished up a h/c LS6 in a 1700lb Lotus 7 and that car was a beast!

cobalt964

its a great motor in a fun car. love it

funnyscreenname

The performance would be the same if starting with the LH6 engine wouldn't it?

Marc Pugh

" lq9/flex fuel injectors 50.00 "

What year are these off of? Where did you find them for that price? do you have a part number and what fuel rail did you use on the ls6 intake.

s-10 Davis

Will that set up work with the Lm7 and be effective. If not what I need to do different?