LS1GEARHEAD

Just been bouncing this idea around in my head, I know that it is not a common build and I dont want a lq4/9 I just want a different build

4.100 crank in Ls1 with 3.903 bore= 392 stroker

Also would it be able to hold a 250 shot?

Gordon0652

iTrader: (4)

I wouldn't.

Silver408z

iTrader: (1)

There used to be companies who would do it. I am sure some still will. But its never been popular and I am sure there are reasons for that.

greatskiiiier

iTrader: (10)

more cubes isnt everything, a stroke like that is going to take forever to rev up, prob wont rev about 5000rpm, and will be a torque monster lacking in the higher rpms

as stated theres reasons for not doing it, plus it would be a PITA to balance and alot of machine to to the block to fit, if its even possible to fit
just my .02

1CAMWNDR

iTrader: (21)

You have no clue what you are talking about. The crank has nothing to do with ability to rev. Cylinder heads, cam, and intake manifold do. My 4.1" stroke iron 427 pulls to 7,000 all day.

If you find a machine shop that can't balance a 4.1" crank they do not know what they are doing with a 4.00" or 3.622" crank either. It will fit in the block just fine; you have to space the windage tray away from the main caps and modify the pick up tube mount to maintain pick up to pan clearance. You also have to clearance the oil pan for the #1 and #2 rod bolts.

I'd only do a 4.100" crank with a motor with more bore so it can breathe better. 4.03" at the minimum.

RsSean

iTrader: (27)

you can go all the way up to a 4.125 stoker crank in a LS1 to make it a 402, with the stock bore, if you do the stroke that you want, make sure that you check the number 7 piston at BDC for a interferance with the reluctor wheel on the crank shaft. Ran into that with a build, and a buddies shop, never seen it before. It turned into a real PITA having to notch the piston and rebalance all the other ones. I say you go for it.

Mike94ZLT1

iTrader: (3)

That's going to pull the piston awfully far out of the cylinder on an LS1, I wouldn't either.

LS1GEARHEAD

Thanks guys on the input anymore opinions all welcomed.

PREDATOR-Z

Unless you sleeve the block, try not to go above 4.00 stroke. 39x cubes are notorious for developing oild burning issues. But it also depends on who builds it.

greatskiiiier

iTrader: (10)

i may have been a little off with some of the stuff i said since ive only BUILT sbcs, but at the end of the day looks like i was correct that 4.100 crank has its issues, choose your words more wisely

racer7088

We do them all the time but not for BIG NOS as you can't get enough skirt in the bore at BDC if you push the rings down on the piston at all which you need to with bigger NOS.

1CAMWNDR

iTrader: (21)

For these motors a 4.100" crank will make a hell of a motor if it is built correctly. Mine is a Callies Compstar crank, Eagle 6.125" rods, and 4.07" Wiseco pistons. Cartek 5X heads, 239/247 LSL cam, Victor Jr intake and Accufab 4150 throttle body. With just routine oil changes it makes a hell of a street/strip motor.

Mike94ZLT1

iTrader: (3)

Your 4.07" Wiseco pistons tell me that you don't have one of "these motors". You either have an iron 6.0, or an LS2 block.

It's really not worth the risk of oil burning issues, aggravation, irritation, etc for an extra 9-10 cubic inches.

racer7088

We use our own custom pistons made by Wiseco but not any of the shelf pistons. We also use a 6.200 rod as well.

kmracer

iTrader: (1)

....? a litttle?

1CAMWNDR

iTrader: (21)

Yes, I have a 6.0L iron block. I guess I didn't pick up on the fact that he was talking about only an LS1 block. I stated above that I thought a 4.100" stroke would be overkill unless you teamed it with a larger bore so the engine can breathe better and use larger cylinder heads.

racer7088

You don't need a larger bore to realize the benefits of a longer crank at ll but you do need it to fit in the 5.500 long cylinder.

TooLateVTEC

iTrader: (2)

LMAO

If you dont know what your talking about....which is very clear you dont...please dont go around the internet posting **** like this ever again b/c one day someone that doesnt know any better it going to believe you.

1CAMWNDR

iTrader: (21)

Better yet, 4.065" bore LS3/L92 block .

Mike94ZLT1

iTrader: (3)

There's no reason to be an *** about it, everyone learns by making mistakes.