NoGamesLS1

iTrader: (16)

I am looking at buying a new rotating assembly. This is whats in it:
Eagle 4340 Forged 4.0" Crankshaft
Eagle 4340 H-beam Rods w/ ARP 8740 bolts (6.125"-6.20" deending on piston seclection)
Probe, JE, Ross piston options, FT, Dish and customs available
Clevite Rod & Main Bearings
Perfect Circle Moly File Fit Rings
383 cubic inches w/ 3.905 (Aluminum block) or 408 with 4.030 Iron Block

I would like to get the 4.1" crank instead of the 4"

Has anyone on here used this/similar set up? Just looking for some comments about it.

NoGamesLS1

iTrader: (16)

I am also using stage 1 ls6 livernois heads with hooker lt's and true duals, an ud pulley, asa hotcam and eventually an ls6 intake.

Its my dd. I am looking for something that will be dependable enough to be a dd, yet strong enough to take care of pests

Beast96Z

iTrader: (21)

You should have no problems with a 4.100 stroke. People run the 4.125 lunati in stock blocks all the time for a 396 ci. Just make sure to specify when ordering so they can get the right height on the pistons.

SideStep

tbojbob

NoGamesLS1

iTrader: (16)

hehe

NoGamesLS1

iTrader: (16)

so you guys just me to be the guinea pig here?

Plum Crazy Rob

iTrader: (3)

MEGA

I've been wondering why nobody uses the Eagle 4.1" crank also...isnt it the
same price as the 4.0 ???? Does it hit something typically????

Beast96Z

iTrader: (21)

Guy's, there's no reason to lurk. The crank will fit with no problems. Your mechanic is going to have to clearence the block for a 4" stroke, so no more work is involved when clearencing for a 4.100" stroke. There are lots of guys on here using the 4.125" crank in a stock block w/stock sleeves. If it makes you feel better, I have a 4.185" stroke crank in my motor.

Plum Crazy Rob

iTrader: (3)

Thanks for the input, Beast...I'll believe you on it clearing...it seems other factors must be at work - the question is why do we not ever see "LS2 412 CI short blocks $3895" from sponsors, or anybody building or installing one = WTF

Is the 4.1 crank not readily available??? This does not make sense to me...If I'm going to "spend the money", I'd be building the biggest engine that amount of money would buy...as NoGames suggests...

Anyone

Beast96Z

iTrader: (21)

I understand what your saying. Engine builders don't advertise it because it is not the "norm". Most of them don't stock this crank, but have an abundance of 4" cranks, because that is what 95% of the guys want. A longer stroke will put the motor "over square", meaning the stroke is longer than the bore is round. Some my speculate to say that this causes increased ring wear because of the added side load on the piston. If built correctly, this couldn't be farther from the truth. When it comes to crate motors, builders are gunna advetise something they can mass produce, and get out for a better price. When I talked to HPE about building my motor, the 4.100" crank was no more than the 4". They just needed to order it. Like I said before, most builders don't stock the crank. Since they were gunna have to order it anyway, I got them to get me a 4.185 Lunati. Bottom line is, is if you want one, you'll just have to call and request it. Then you'll have to wait for the engine to be built instead of getting one off the shelf.

NoGamesLS1

iTrader: (16)

Beast- have you dynoed? And what else are you running with this setup? Is it streetable? I have a m6. Im very interested. Will likely go this direction...

Beast96Z

iTrader: (21)

The motor is being built as we speak. I have a much larger bore than stock, but it will be a street car. I'd say that it is a very good direction to go. I would also look into a LS2 block If you aren't already doing so.

NoGamesLS1

iTrader: (16)

Do you think this will be fine without a tune? I will have it dyno tuned, but not for a month or 2

Randy WS6

iTrader: (69)

I just got my Eagle 4.100 crank shaft ,very nice looking for my aluminum LS2 418cid.

RAMPANT

iTrader: (17)

See sig!

412 ci Ls2

- Eagle 4.100 crank
- 6.125 CompStar rods
- Wiseco pistons 4.0005 bore (coated skirts and tops)
- AllPro heads

This has been a great combination so far. I have about 65 passes on it so far and 3 autocross events with 7-10 runs per event.

I'm surprised more have not gone this way too.

Rampant

Beast96Z

iTrader: (21)

You'd run the risk of washing out the cylinders if you don't get it tuned. Just save a little extra and get it all done at once.

NoGamesLS1

iTrader: (16)

What washing out the cylinders?

Randy WS6

iTrader: (69)

a whole lot of fuel that cant be burnt and washes all the oil off the walls and losing the sealing of the rings causeing loss of compression plus can cause galling or pilling of the piston skirt witch can destroy the piston and cylinder walls

NoGamesLS1

iTrader: (16)

Im looking at an iron block bore .040 With this crank Id be at a 420.46. Anybody see any problems? Also how big of an injector would I need?
Also anyone looking to get rid of a 6.0 block?