Stroking an LS1
06-02-2010, 01:35 PM
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Stroking an LS1
Guys, I have searched and not found a lot. Most all posts I find on this are just questions with no answers. If I cant find what I'm looking for here I might sign up on LS1tech and see what they got stored.
As many of you know I have an '02 aluminum LS1 thats goin in my '01, but its on the backburner now because I'm almost done building my old 350 for my '85.
When I build it I want it to be a badass, not just a stock motor with heads and a cam. I keep throwing around the idea of forging it from the get-go. But the main question is should I stroke it.
I recently to the engine down, supposed to had 52,000 miles on it and prolly did, but I wonder what type of power adder/nos they had on it in its life, cause some of the bearings are shot and one of the pistons was broke. I brought the crank in the machine shop thats doing the work on my other 350 block, and he said he'd prolly have to grind that crank down, not polish it like I hoped.
So that leaves me here. I dont want to run a ground down crank with oversized bearings on a 400+ HP motor. If I have to aquire a new crank, I am thinking of stroking the motor.
What all is needed to make a stroker out of this 347? I'm assuming that comes out to a little less than 383....bigger crank? from what? longer stroke rods and different pistons?
Please help me grasp this idea, I want to build the best I can from the start. Thanks!
As many of you know I have an '02 aluminum LS1 thats goin in my '01, but its on the backburner now because I'm almost done building my old 350 for my '85.
When I build it I want it to be a badass, not just a stock motor with heads and a cam. I keep throwing around the idea of forging it from the get-go. But the main question is should I stroke it.
I recently to the engine down, supposed to had 52,000 miles on it and prolly did, but I wonder what type of power adder/nos they had on it in its life, cause some of the bearings are shot and one of the pistons was broke. I brought the crank in the machine shop thats doing the work on my other 350 block, and he said he'd prolly have to grind that crank down, not polish it like I hoped.
So that leaves me here. I dont want to run a ground down crank with oversized bearings on a 400+ HP motor. If I have to aquire a new crank, I am thinking of stroking the motor.
What all is needed to make a stroker out of this 347? I'm assuming that comes out to a little less than 383....bigger crank? from what? longer stroke rods and different pistons?
Please help me grasp this idea, I want to build the best I can from the start. Thanks!
06-02-2010, 05:51 PM
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ok david but how do you get there?
also, is the bore of the ls1 smaller than the bore of the older 350's? i bought some new pistons for my old 350 the other day and just for giggles stuck one up to the cylinder on my ls1 on the stand, and it wouldnt go in. Is this why they are a 347 and not a 350?
also, is the bore of the ls1 smaller than the bore of the older 350's? i bought some new pistons for my old 350 the other day and just for giggles stuck one up to the cylinder on my ls1 on the stand, and it wouldnt go in. Is this why they are a 347 and not a 350?
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06-02-2010, 06:23 PM
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ok david but how do you get there?
also, is the bore of the ls1 smaller than the bore of the older 350's? i bought some new pistons for my old 350 the other day and just for giggles stuck one up to the cylinder on my ls1 on the stand, and it wouldnt go in. Is this why they are a 347 and not a 350?
also, is the bore of the ls1 smaller than the bore of the older 350's? i bought some new pistons for my old 350 the other day and just for giggles stuck one up to the cylinder on my ls1 on the stand, and it wouldnt go in. Is this why they are a 347 and not a 350?
Your LS1 specs. Bore 3.465 (99)mm and the stroke is 3.622 (92)mm. All ls1 ls6 lq4 lq9 and 5.3 cranks share the same stroke the 4.8 is the only smaller one. The bore is what makes the differances.
Last edited by MARK3406E; 06-02-2010 at 06:32 PM. Reason: Added specs
06-02-2010, 06:42 PM
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Yes a ls1 is smaller. A stock old 350 is 4 inch bore and 3.48 inch stroke. Call Callies and tell them what your after. They do make stroker kits for Ls1 engines. Or if your after a really nice package go for something like this.http://www.hiperperformance.com/serv...LS6-383/Detail
Your LS1 specs. Bore 3.465 (99)mm and the stroke is 3.622 (92)mm. All ls1 ls6 lq4 lq9 and 5.3 cranks share the same stroke the 4.8 is the only smaller one. The bore is what makes the differances.
Your LS1 specs. Bore 3.465 (99)mm and the stroke is 3.622 (92)mm. All ls1 ls6 lq4 lq9 and 5.3 cranks share the same stroke the 4.8 is the only smaller one. The bore is what makes the differances.
The Callies rep on here has a better deal going than shown in the link you provided.....
06-02-2010, 06:47 PM
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OOOPPPPSSS. you are correct sir. Dont know what i was thinking. Thats one tiny bore. I agree on going with Callies thats why I mentioned it in my post. They gave me an awesome quote on a 408 kit for my 6.0. I was just throwing up a link to show a well built kit.