LS2 block can be bored to...?
A 403 (4.005x4) or 404 (4.010x4) would give you a nice boost with a good set of heads. 530rwhp is attainable with the right setup with a 402. 550+ is possibly as well if you're willing to go all out. That's a nice bump over where you are now.
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TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Yes, see when increasing stroke you bring the piston further down in the cylinder which exposes the bottom of the piston out of sleeve further at BDC. This action allows the piston to rock more and eventually can lead to an increase in oil blow by consumption.
One could resleeve with longer sleeves and that helps if one is set on running bigger than 4.00 stoke.
One could resleeve with longer sleeves and that helps if one is set on running bigger than 4.00 stoke.
Yes, see when increasing stroke you bring the piston further down in the cylinder which exposes the bottom of the piston out of sleeve further at BDC. This action allows the piston to rock more and eventually can lead to an increase in oil blow by consumption.
One could resleeve with longer sleeves and that helps if one is set on running bigger than 4.00 stoke.
One could resleeve with longer sleeves and that helps if one is set on running bigger than 4.00 stoke.
Thread Starter
Joined: Nov 2005
Posts: 7,615
Likes: 65
From: NYC
yes, see when increasing stroke you bring the piston further down in the cylinder which exposes the bottom of the piston out of sleeve further at bdc. This action allows the piston to rock more and eventually can lead to an increase in oil blow by consumption.
One could resleeve with longer sleeves and that helps if one is set on running bigger than 4.00 stoke.
One could resleeve with longer sleeves and that helps if one is set on running bigger than 4.00 stoke.
Thread Starter
Joined: Nov 2005
Posts: 7,615
Likes: 65
From: NYC
My goal is to reach 427 inches-or so. The LS7 block is rather costly. With a four inch stroke, it'll have longer sleeves? Are the sleeves in a LS3 block as long as in the LS7 block?
I wouldn't get hung up on the couple of cubes a max bore will buy you. Bore it what it *needs* to clean up, you'll have a more stable bore under power and make more power as well as being more durable.
LS3 block + 4.100" stroke would be an okay combination. 4.07" x 4.1" would get you 427 on the nose. Wiseco makes pistons for the 4.100" stroke that reduce some of the oil consumption issues. However, you end up with a thin crown on the piston, so it's pretty much an NA only setup or very mild boost/nitrous. It's only a little bit more expensive than the LS2 and a cheaper alternative to the LS7.
An easy way to decide your combo: Divide your rod length by the stroke, if the number is lower than 1.50, try and avoid it. A 6.125"rod length divided by 4.0 =1.53, still reasonable. A 6.125 length divded by 4.250' =1.44, not so much.
Thread Starter
Joined: Nov 2005
Posts: 7,615
Likes: 65
From: NYC
The rotating assembly I'm looking at is the new kits from Wiseco with K1 cranks & rods-unless somebody think's it's not a good product/kit.
Last edited by Paul Bell; Jun 18, 2013 at 07:10 AM.