The big question.
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Teching In
Joined: Jul 2009
Posts: 24
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From: Hamilton, Ontario
The big question. Alright folks, here it is. I want 550rwhp. NA, no boost, no spray.
I have ruled out a ls7 drop in, and now leaning more towards some sort of stroker build. All feedback is greatly appreciated. lets get this started.
I have ruled out a ls7 drop in, and now leaning more towards some sort of stroker build. All feedback is greatly appreciated. lets get this started.
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As far as I know the biggest benefit to the LS7 block is that they have longer bore sleeves. The block was built for a longer stroke than the LS3 block was and pistons hang out of the sleeves pretty far on a stroked LS3. With that said there are plenty of stroked LS3 blocks out there. sdparts.com shows LS3 blocks for $1400 and LS7 blocks for $2700. If you're building from scratch that would be about the only cost difference when deciding between the two as far as I know.
If you haven't seen Pat G's thread on getting 500 whp with a stock cube LS1, check it out
https://ls1tech.com/forums/generatio...heads-cam.html
Using a similar approach with extra cubes should get you close.
I'm no expert on any of this but one thing I've always been really interested in is combustion chamber design. From what I understand, and to try to put it simply, having a small chamber in the heads, and a matching relief in the pistons gives a large quench area and a chamber less prone to detonation allowing higher compression on pump gas. Better than a flat piston. What I'm getting at with that is, with custom pistons to match a combustion chamber, rather than just off the shelf pistons should help squeeze as much power as possible. It's something to look into and see if the extra cost would be justified
If you haven't seen Pat G's thread on getting 500 whp with a stock cube LS1, check it out
https://ls1tech.com/forums/generatio...heads-cam.html
Using a similar approach with extra cubes should get you close.
I'm no expert on any of this but one thing I've always been really interested in is combustion chamber design. From what I understand, and to try to put it simply, having a small chamber in the heads, and a matching relief in the pistons gives a large quench area and a chamber less prone to detonation allowing higher compression on pump gas. Better than a flat piston. What I'm getting at with that is, with custom pistons to match a combustion chamber, rather than just off the shelf pistons should help squeeze as much power as possible. It's something to look into and see if the extra cost would be justified
Just saw the LSX block is about $2300. Never looked at those blocks much because I never thought I'd use one but at that much less than an LS7 block it would be good for a big inch engine if you don't mind the extra weight.
What kind of 550whp N/A motor are you talking? Race car, street car that needs some sort of decent driveability on the road? More ways then one to get that peak hp level, but what is it intended for? You could have a smaller cube motor that'll make that power but sbsolutely suck *** to drive on the street, or a big cube motor (stroked LS3 / ~418ci +) that'll make that power but be nice to drive on the street.
Give some more details so people can post more helpful info and point you in a better direction.
Give some more details so people can post more helpful info and point you in a better direction.
