89ws6formula50

iTrader: (6)

I parted out my Grand National and am now undertaking a turbo LSx build. Dont have a car for it yet but will probaly be buying my moms 01 Z28 back. Most likey will be working with Weber Racing on the build, already been in contact with them awhile back when this combo was going in my GN.
They suggested 370 but I was wondering what are the advatages and disadvantages from 370 vs 408 with FI. Will mostly be a weekend warrior car but road worthy

NA$TY-TA

iTrader: (21)

I need to know what your going with... a SC or turbo????

Then we can go from there........

SSilverSSurfer

iTrader: (8)

it says in the first sentence hes going with a turbo Lsx build

BIG BAD BLACKSS

iTrader: (4)

370 ???! Speed inc's shop car put down 995RWHP with a turbo on one of their 370s and ran high 8's. Car is driven to car shows and around town. Do you need more then that?
http://www.ls1speed.com/shopcar.cfm

89ws6formula50

iTrader: (6)

thats what im talking about, sounds like 370 stock crank to me

wow, that car is insane

dc96819

Then a408 would be 1200hp

ls1290

iTrader: (20)

With turbos you want faster spinning assemblies. I would go with the stock stroke length and 6.125" rods. The longer rod will help reduce the angular momentum on the crankshaft and will allow it to spin faster and safer.

Keith

mdhmi

iTrader: (1)

That looks like a very sweet setup. My concern with strokers + turbos is extra torque in the lower part of the power band where it really isn't needed, plus the usual issues of oil consumption.

DrTurbo

iTrader: (3)

Engine size has nothing really to do with the turbos power.

Whether on a 100ci engine or 400ci engine the turbo will only flow X amount of air. In some cases the more efficient setup is the smaller cube setup which actually will make more power then the big cubes.

NA$TY-TA

iTrader: (21)

FYI My stock crank on my 370 was flexing.... ran it between 850-1000+rwhp for a YR like that.... could tell by looking at the mains....

Kyle

89ws6formula50

iTrader: (6)

just picked up a brand new set of 317 heads....getting there

bluecamaroz28

No A/C, right?

CHRISPY

Depends entirely on HP goal and turbo size. You can spin a 408 to 8K rpm if you want to...
I'd go with 370 cubes and T88 or similar size turbo. It'll be easier to package.

89ws6formula50

iTrader: (6)

looking at the L92/L67 combo to top it off instead of the 317's. WOould this make a significant improvement

cablebandit

iTrader: (37)

for 1000rwhp, you are looking at possible head lifting issues. I'd go 370 (i like the 408 better personally) and with the money you saved over the 408, get some thicker deck heads like the AFRs or 408...oringed 317. I like the 408 for off boost daily driveability and helps spool a big t6 housed turbo,,,since its not a daily driver...370 thick deck heads and a s488 turbo...my 3 cents

89ws6formula50

iTrader: (6)

steel main caps?

NA$TY-TA

iTrader: (21)

Yep and ARP studs.............

89ws6formula50

iTrader: (6)

ok, got L92 heads now, where can I get an L76 intake? PN?
Guess I have a set of new 317 heads for sale now

HitmanLSX

Would a girdle help with that or is that mostly for the block? (n00b question but lookin at a stock crank FI job)

DrTurbo

iTrader: (3)

Girdle is for the block and mains if their is movement. Apparently most of the LS1's aren't having that problem. Most of the problem comes from head sealing problems.