3400 spring build

[geldartb]

ok im looking into the stroker side of it and am not really finding what i want for info. basically whats the best crank to use for a good power boost.

she will be getting a cam too already got ported heads with ls6 spriings on them.
im looking to build a motor that will scream like a mofo and have good power to go with it. this is not my daily driver so im not worried about that aspect of it.

[gectek]

new 3500 crank with clearances on the block and pan, and also ofset grinding the rod journals...those have been talked about quite a bit...most 3500 cranks are either forged steel or cast steel, and knife edging them and using a crank scraper would be a good way to add to the power and revs

[geldartb]

now i start the search for the 3500 crank. would i have to get an external crank trigger for that or is that just if im using the 3500 itself in my car.

[CNCguy]

now i start the search for the 3500 crank. would i have to get an external crank trigger for that or is that just if im using the 3500 itself in my car.

The 3500 crank has a different reluctor wheel and would require a change to make it work.
You have a few options:
A) Use a compatable ECM
B) External wheel
C) Change ring on crank to one with 6+1 slots
D) May be able to remove original rings and have slots cut into crank but not 100% sure about that.

The external triggers were made to eliminate the need to disassemble a good engine. The goal was to be able to bolt it on and go.

[AaronGTR]

new 3500 crank with clearances on the block and pan, and also ofset grinding the rod journals...those have been talked about quite a bit...most 3500 cranks are either forged steel or cast steel, and knife edging them and using a crank scraper would be a good way to add to the power and revs

Actually there was some talk about that on here and I think it was determined that none of the cranks are forged. They don't have the correct forging lines in them. Some are cast steel, which is still stronger, and some are cast iron.

[gectek]

i thought it was cast steel and forged, ill do more searching though, maybe a thread i didnt look at

[geoffinbc]

No there are forged cranks. People here have them.

[3400-95-Modified]

No they are NOT forged... Check with GM. A few people have done some more research and found out they are ONLY cast steel... Still stronger but NOT forged.

[AaronGTR]

Here's the thread that was talking about it before. http://60degreev6.com/showthread.php?t=35518&page=2

Still kinda vague as to whether any where forged or not. It's been fairly firmly established that not every 3500 came with the steel crank though since they don't all have that number on the end. If they don't say 7484 on the end they are cast iron, so 3500's came with both cast iron and steel cranks. The question I guess is whether the steel crank is cast or forged.

Knowing GM I'd be inclined to say it's cast and not forged because of cost. Either way it's still going to be stronger and lighter than the iron crank.

[bszopi]

Either way it's still going to be stronger and lighter than the iron crank.

Its actually a few pounds heavier than the cast crank.

[AaronGTR]

When I sorted this out months ago with GM parts direct I was informed of the weight difference which I posted on here somewhere being about 5 lbs between the cast crank and the steel crank and that's how I was able to make the 7484 association which was stamped on both of my cranks

Ah, this is what I was basing that on. Info Joseph Upson posted. I didn't notice he didn't mention which one was lighter. I just saw the 5lb weight difference... my bad.

[3400-95-Modified]

Yes its friken heavy, Shipped at 52 lbs IIRC...

[geldartb]

well right now im pretty sure im gonna pick up a 3500 from the jy for 500, and use the top end off of it. and then something like a stage 2 cam, been looking at the specs ben posted and ill most likely be buying one from the 60degree store.

and unless i can find something by april at the latest that will definately work and provide a nice power gain im going to ditch the storker idea, cause as of now thats the only thing im up in the air about.

the only idea i had was to use a 3100 crank but that most likely wouldnt do anything to benefit me.

so if anyone has specs on a good cam that i could give to ben at the 60degree store to have made post em up. this isnt going to be my daily so im not worried about that aspect of it. im looking for something like a stage 2.

[3400-95-Modified]

3100 crank is the same as a 3400 one... I'm running a 94 3100 crank in my 01 3400 with replacement pistons and stock rods from a 3400... so It can't stroke it otherwise I would have had some issues.

[geldartb]

yeah i kinda figured that about the crank. dont even know where i got that one from. but for now it seems like im gonna be going the cammed 3400 block with the 3500 top end.

might have the heads shaved a little something along the lines of .020, if i can find someone to do a 3-angle valve job. guess its time to break out the phone book and find a place.

oh yeah and get a 4t60-e to rebuild to. cause you know whats in there wil grenede on the first pass.