89lx-ls1

iTrader: (23)

I AM BUILDING A 393 ALL STROKE LS1 (3.905 BORE, 4.100 CRANK AND 6.125 RODS) PATRIOT STAGE 3 HEADS WITH 2.08 AND 1.60 VALVES THAT FLOW 334@600 FUTRAL CUSTOM CAM 243/250 617/630 112+4 LSA. I AM GOING TO RUN A 750 CARB AND A SINGLE PLANE INTAKE 1 3/4 HEADERS. ALSO GOING TO RUN A ELECTRIC W/P AND THE ONLY THING DRIVEN BY THE MOTOR WILL BE AN ALT. ALL THIS IS GOING THROUGH A 700R4 W/ 3600 LOCKUP CONVERTER AND A 3.73 GEAR. CAN ANYONE GIVE ME A RWHP GUESS OR EVEN A FWHP GUESS. jUST TRYING TO GET AN I DEA, I PLAN ON AROUNG 450 RWHP.

THANKS IN ADVANCE
JON

Big-DEN

Should make a shitload of power.

Reason being, even with the LSX intakes these 335CFM heads are being choked down to under 300CFM.

If your induction doesn't cut off the flow of the heads, you should be fine. If you have the resources, i'd have that intake and head flow tested together and the intake ported so
that with head and intake bolted together flow is 320 or greater CFM.

Carb should prolly be an 850-950CFM range.

Headers can be 1 3/4" a 1 3/4" stop to 1 7/8" or 1 7/8".

If there is an exhuast it is at least 3", and header collectors are 3" or 3.5".

Its going to make some power, that is for sure.

destroyerSS

iTrader: (2)

I have not heard of patriot heads flowing that kind of number.

gator's 99TA

iTrader: (2)

1) patriot heads wont flow that number
2) why all that stroke with the tiny bore?

BORE=HP

jrp

iTrader: (16)

because they dont. the CNC program for the stg2 and stg3 heads are the same, the differerence is in the valve sizing.

LSONE

iTrader: (1)

that is way too much stroke IMO, the piston is almost going to come out of the sleeve.

https://ls1tech.com/forums/generation-iii-internal-engine/359699-402ci-408ci-rocking-pistons.html

DONAIMIAN

iTrader: (18)

I dont see this motor making over 500 (over 480 honestly) and its no way thoes heads are gona flow that number one a 3.90 bore.

89lx-ls1

iTrader: (23)

The Cubic Inches Are Definetly There And Bore Doesn't Equal Hp Ci Equals Hp.

gator's 99TA

iTrader: (2)

Ci doesnt equal hp. sorry. big bore allows a big intake valve. filling the cylinder and adding to the volumetric efficiency makes power. adding more stroke to a motor that already hurts for a small bore/stroke ratio isnt going to make ya happy. its been proven over and over again with the 382 all stroke stock bore (sleave) ls1 motors are very dissappointing on the power. but go dyno and i hope you prove me wrong.

89lx-ls1

iTrader: (23)

Ttt Any More Info Out There

xfactor_pitbulls

iTrader: (16)

I agree with what you are saying for the most part. It is important for people to realize that to flow in the 330+ range you are going to USUALLY need a 2.08 or 2.1 intake valve and a big enough bore to let the flow path remain open. The extra stroke will NOT result in huge HP numbers. I bet it might make 480tq though. IMO, scrap that sleeved block and go with a 4.020 bore or bigger iron block setup. Much better results to be had there.

Brandon

xfactor_pitbulls

iTrader: (16)

Oh yeah and I just noticed your sig. You are going to put this setup behind an A4 setup? The OD is going to help drop the RPMs, but still not make it a friendly daily driver on that much stroke. You need to not only think about how many revs you are turning, but also what the feet per minute of the piston movement is. That will indicate more accuratley the wear and stress your rotating assembly is under. After all, arent you thinking this setup will be a DAILY DRIVER.

Brandon

89lx-ls1

iTrader: (23)

The 393 isnt but .100 longer stroke than a 383 so i dont see why it wouldn't be that good of a daily driver. How do you figure VE

DONAIMIAN

iTrader: (18)

A 393 wont put out HP numbers that much better that a 383. I could see you gaining 15rwhp at the most. It wont be a good daily driver because IMHO its too much damn tq. Youll never hook on the street.

The formula for VE is:
I got that out of the 2002 Edelbrock catalog that I had laying around.

antz01ta

iTrader: (3)

how did you figure that one out, my car drives as smooth as stock.
395 all stroke, 4.125 crank. 242/242/.595/.595/112 11.0 cr

heads on my motor are comparable to a patriot, i plan to switch to a 225 afr in the future.

kumar75150 made 500+ rwhp with his 395 all stroke.

i do agree that a big bore will make more power but an all stroke motor will still make great power and lots o torque down low.

Big-DEN

He's right, the all stroke - while not ideal will make more power than a 346 given equal parts and proportionate more tq...

Now with the commonplace of 450-480rwhp 346's on this board, I don't see why 500+rwhp
out of a 395 all stroke will be that big of a deal.

JZ'sTA

iTrader: (23)

Sadly we have more 500+ RWHP 346's on this site then we have 382's. The combo works but isn't impressive IMO. I agree with Gator as the bore is a bigger factor in the LS1 world to make power. With the 382/383/393/395/396 stroke combo's out there you spend a lot of money for very small gains. The motor's are way out of square.
I would rather see a 402 LS2 build.
I did a 408 but didn't want the extra weight of the iron block so I bought lightweight carpet, Aftermarket K member and A arms to fix that problem.

Guys he is also going through a A4 so make sure you look at that when guessing HP.
IMO you will be VERY lucky to make 450 with that combo.

gator's 99TA

iTrader: (2)

ding ding ding! over square motors =

IMO 450 rwhp would be GREAT for that setup.

xfactor_pitbulls

iTrader: (16)

Well you have an M6 and he has an A4, so that is the BIG difference. Apples to apples man, come on. Its not always about how it drives, I was making more reference to the fact that even if the rpms are tolerable comparable to a stock cubed motor the rotating assembly speed is much faster. I realize its the same stroke as a 408 and 427, and you also dont see those daily driven most times UNLESS they are in 6 speed cars.

Brandon

89lx-ls1

iTrader: (23)

I just don't have the money to go through and sleeve this block and i dont want to ad hte wieght of the iron block