427 ci Stroker Idea!
Thread Starter
Safety Car
Joined: Jul 2005
Posts: 4,275
Likes: 4
From: Vancouver WA
427 ci Stroker Idea!
Does anyone know if it's possible to put a 4.25 inch stroker crank in a LS2 block? I was thinking I could get some 6.00 long Carillo rods custom made and use 4 inch stroke off the shelf pistons. This would give me 427 cubic inches with a stock LS2 block without having to spend $6k+ just on a block.
Le Mans Master
Joined: Jun 2004
Posts: 6,269
Likes: 50
From: Dallas Texas
St. Jude Donor '06-'07-'09-'10
Originally Posted by FixedRoof
very very interesting... 
If the 41/4 crank will work, are you sure that piston and rod combination will give the right deck height? 
Thread Starter
Safety Car
Joined: Jul 2005
Posts: 4,275
Likes: 4
From: Vancouver WA
Originally Posted by sxe60
If the 41/4 crank will work, are you sure that piston and rod combination will give the right deck height? The one area I need to look at is the Rod angle from going to a longer stroke and a shorter rod. I don't think there is enough room to move the wrist pin up higher on the piston, or you could have custom pistons made. And I like the idea of having off the shelf pistons than custom made pistons. I am going to draw up the piston on Cad and see what it looks like.
Burning Brakes
Joined: Sep 2001
Posts: 1,173
Likes: 1
From: Aguila AZ
Some tuners have used the 4.25" stroke, but you must use a rod that is not shorter than 6.200" due to crank counter weight and reluctor wheel interfearance. Also the piston is extremely short with a compression height of less than 1.00" and a very tight ring pack. You can always go to heroic means to make it fit, but this is expensive. I have used the 4.125" stroke with great success but it still requires cutting the reluctor wheel diameter and clearancing the #8 piston. you can achieve displacements up to 442 cid with the 4.125" crank without to much hassle. If you want 427 cid there are easier ways to get it. 4.00"B X 4.125"S is the most common, but there are other alternatives, ie; 4.060"B X 4.125"S, 4.080"B X 4.080"S are other options.
Shirl
SD Racing Enterprises
Shirl
SD Racing Enterprises
Thread Starter
Safety Car
Joined: Jul 2005
Posts: 4,275
Likes: 4
From: Vancouver WA
Originally Posted by MrEracer
Some tuners have used the 4.25" stroke, but you must use a rod that is not shorter than 6.200" due to crank counter weight and reluctor wheel interfearance. Also the piston is extremely short with a compression height of less than 1.00" and a very tight ring pack. You can always go to heroic means to make it fit, but this is expensive. I have used the 4.125" stroke with great success but it still requires cutting the reluctor wheel diameter and clearancing the #8 piston. you can achieve displacements up to 442 cid with the 4.125" crank without to much hassle. If you want 427 cid there are easier ways to get it. 4.00"B X 4.125"S is the most common, but there are other alternatives, ie; 4.060"B X 4.125"S, 4.080"B X 4.080"S are other options.
Shirl
SD Racing Enterprises
Shirl
SD Racing Enterprises
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Burning Brakes
Joined: Sep 2001
Posts: 1,173
Likes: 1
From: Aguila AZ
No, I did not say an LS2 can be bored to 4.080". I am currently running an LS2 block with a .030" over bore (4.030") and a 4.125" stroke for 421 cid. This is in my road race car and I have subjected it to numerous intense 20 minute road race sessions with no problem. It also ran 11.60 @ 123 mph on an easy pass at Firebird Raceway one time. I'm a road racer, not a drag racer. I have also bored two LQ4 iron blocks to 4.080" with no problems as well.
Shirl
Shirl