Nacho SS

iTrader: (4)

well the ls2 crank is 13mm longer...what would you do there? i know you could prob machine it, but thats a big obstacle in the fwd set up.

Sittingmongoose

iTrader: (1)

I have researched this throughly. You can not do that. The reason is the entire crank is different. If you really wanted a new crank than you would have to get it custom built.

Haulin_Ls4_GxP

iTrader: (1)

The crank can't be that much different if all the journals are the same.Yes the crank is 13mm longer but thats nothing but turning it down. As for the counter weights(I'm assuming this is what you are talking about being so different) they might be bigger on the ls2 crank but that to could be cut down. I'd be willing to bet modifying an ls2 crank would be much less than having a custom one made. Anything can be done if you put your mind or money to it.

bumpin96monte

You honestly don't think there are positive dyno results to be had from a cam in these engines? Come on man, just because you've had such bad experiences with your setup doesn't mean a cam can't improve power on these cars. If rockers have shown a measurable gain, I don't see how a cam wouldn't- not to mention many of the various aftermarket cams seem to work just fine in other LSx engines; our engines aren't that significantly different.

I honestly think that for someone to gain good power from a cam (especially an aggressive one)- they need to get the headers and a different intake manifold on there to eliminate the main restrictions; but I don't see any reason why the LS4 would be any different than practically ever other engine out there.

AlabamaGuy

iTrader: (5)

The LS2 has the same stroke we do, no reason to machine the crank.

On the other note, there is no way you can bore out our sleeves that much. We can NOT bore the stock sleeves out another 21 cu in.

nmp0098

You wouldn't happen to have pictures of your crank lying next to the stroker crank, would you? I know that you had both out to look at and see the differences. Not that I want to stroke my engine or anything, but it would be useful.

Like others have said, there is almost no difference between an iron block and an aluminum block because the aluminum blocks have iron sleeves. It's not like aluminum heads vs. iron heads. The aluminum block is all about weight reduction.

LPE was able to bore and stroke a 346 out to 427 before the LS7 hit the scene, but it wasn't cheap. They put it in the Vettes they resell for the customers that wanted to go N/A. Since they were selling 600-2000HP TT 346's at the same time, I don't know why anyone would have bought one save for nostalgic reasons. There's nothing quite like buying a new Corvette and then chipping off another 40 grand plus.

Haulin_Ls4_GxP

iTrader: (1)

Yep I found that out last night after looking around some more. Man I feel like a dumb *** but I did fine a place here in Ohio that makes crankshaft for 5sec. Drag cars and there 4340 forged 350 cranks were only like $300 or $400 so I'm gonna give them a call Monday and see what they are about

AlabamaGuy

iTrader: (5)

There's absolutely no reson to put a forged crank in an LS4. Forged pistons/rods will handle way more power than we will ever throw at these cars, much less transmissions.

94ss06gxp

iTrader: (5)

if i were ever gonna put enough money to make the LS4 a stroker i would rather spend the $$ for a RWD swap and throw in a LS2 or LS3

Haulin_Ls4_GxP

iTrader: (1)

If the trans is built there's no reason it can't handle 600-700hp.

Mgpeagle

iTrader: (6)

You easliy can make a 4t65e-hd handle 500 - 700 whp. Some 9 second cars were running 4t65e-hd's in the car. With enough cash you can make them "almost" indestructible. Intense and ZZP were both running 4t65e-hd's in thier 9 and 10 second cars.

-Mike

Nacho SS

iTrader: (4)

its actually hard to find that 1" GM chain that contributes to 90% of our tranny's strength when built.

AlabamaGuy

iTrader: (5)

Ok....at what point is a forged crank actually going to become *necessary*?

JDMC5

iTrader: (3)

I'm pretty sure that's because they don't make it anymore........pretty sure.

that's a hard question to answer but I would probably recommend a crank upgrade around 700hp.

AlabamaGuy

iTrader: (5)

Thank you. If you want to fog it or run a ton of boost, rods and pistons.

Haulin_Ls4_GxP

iTrader: (1)

Last I checked this wasn't just about getting a forged crank it was about boring and stroking. So on that note most if not all shops that make custom cranks are are making them forged weather they are 4340 or 5140.

AlabamaGuy

iTrader: (5)

I'm trying to figure out why you're wanting to get a custom crank made.

Bryan921SS

If you guys want big N/A power then buy a cheap F-Body and throw money at that.....


These cars are nice, decent handling daily drivers/grocery getters.....

94ss06gxp

iTrader: (5)

Truth.....

Haulin_Ls4_GxP

iTrader: (1)

More stroke