What cubic inch is too large?
What cubic inch is too large? I was just trying to get a build together for later on down the line and would like your opinions and wisdom.
What is the largest CI you would go on a iron LS block and why?
I would like to have a low 8s car or minimum of 1500rwhp. I know ci/stroke plays a factor into a FI car. But I would rather ask guys with experience. The reason Im asking is I know that there are a lot of low 8 cars on iron blocks (not aftermarket) and just seeing what you guys think. I would like an ERL block eventually but dont wanna buy one unless its completely necessary.
I was thinking either a 416ci, 427ci and 434ci(I know the walls are getting thin). Mainly because they all retain a 4.00 stroke.
I may go LS sooner than I think. Just a little wishful thinking!
What is the largest CI you would go on a iron LS block and why?
I would like to have a low 8s car or minimum of 1500rwhp. I know ci/stroke plays a factor into a FI car. But I would rather ask guys with experience. The reason Im asking is I know that there are a lot of low 8 cars on iron blocks (not aftermarket) and just seeing what you guys think. I would like an ERL block eventually but dont wanna buy one unless its completely necessary.
I was thinking either a 416ci, 427ci and 434ci(I know the walls are getting thin). Mainly because they all retain a 4.00 stroke.
I may go LS sooner than I think. Just a little wishful thinking!
Launching!
Joined: Oct 2006
Posts: 201
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From: Grand Rapids, MI
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Oh Ok, gotcha. How would you think a destroked 6L block fair in this situation? Since I have more wiggle room with boring on the iron block.
I think I over shot the CI with the 416ci+. Lol
I think I over shot the CI with the 416ci+. Lol
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So you're talking about using a 6.0 iron block, not an LSX block, correct? Out of the cubic inch sizes you listed originally, the typical 416 uses an LS3 block with a 4.000" stroke. The 427 uses a 4.125" bore with a 4.000" stroke, which could be a sleeved LS1, LS2, LS3 block, or an LS7 block. Probably the largest you'd get out of a 6.0 iron block would be a 408, anything more would require a longer stroke or larger bore, neither being ideal. Now if you were thinking about an iron LSX block, that's another story.
Yea. Iron 6.0 block right now. Unless I need an aftermarket LSX block.
My next question is which is more important bore or stroke? I mean I understand a happy medium of having both.
Any thoughts on destroking a 6.0 block with a 3.268?
I dont wanna try to use an aluminum block unless its aftermarket. Which I am trying to hold off on unless completely necessary.
Thanks for the input guys. Keep em coming!
My next question is which is more important bore or stroke? I mean I understand a happy medium of having both.
Any thoughts on destroking a 6.0 block with a 3.268?
I dont wanna try to use an aluminum block unless its aftermarket. Which I am trying to hold off on unless completely necessary.
Thanks for the input guys. Keep em coming!
Last edited by SwampWS6; Dec 29, 2014 at 06:14 PM.
beyond about 1200rwhp don't plan on a stock 6.0 iron block being able to keep the heads down reliably. You need 1/2" head studs/machining, aftermarket thick deck heads, doweled/pinned main caps to even propose realizing anything close to that.
At that point just get an LSX block.
Champagne dreams.... on a Boone's Strawberry Hill budget.... keep it around 1100rwhp or you'll be changing head gaskets as a weekly tune up. A goal of running 8's is a very achievable feat. Trying for 7's you better have a deep f*cking wallet as things break..... often.
The LS9 motor I have runs a stock $100 Ls1 crank (376ci) and makes more power than I can use 1100rwhp. That's about the limits of the block/heads reliably. Can it make more.... yes as the turbo is rated at 1650hp.... but it simply won't last. Decide how often you want to pull the motor apart.... weekly or annually.
At that point just get an LSX block.
Champagne dreams.... on a Boone's Strawberry Hill budget.... keep it around 1100rwhp or you'll be changing head gaskets as a weekly tune up. A goal of running 8's is a very achievable feat. Trying for 7's you better have a deep f*cking wallet as things break..... often.
The LS9 motor I have runs a stock $100 Ls1 crank (376ci) and makes more power than I can use 1100rwhp. That's about the limits of the block/heads reliably. Can it make more.... yes as the turbo is rated at 1650hp.... but it simply won't last. Decide how often you want to pull the motor apart.... weekly or annually.
beyond about 1200rwhp don't plan on a stock 6.0 iron block being able to keep the heads down reliably. You need 1/2" head studs/machining, aftermarket thick deck heads, doweled/pinned main caps to even propose realizing anything close to that.
At that point just get an LSX block.
Champagne dreams.... on a Boone's Strawberry Hill budget.... keep it around 1100rwhp or you'll be changing head gaskets as a weekly tune up. A goal of running 8's is a very achievable feat. Trying for 7's you better have a deep f*cking wallet as things break..... often.
The LS9 motor I have runs a stock $100 Ls1 crank (376ci) and makes more power than I can use 1100rwhp. That's about the limits of the block/heads reliably. Can it make more.... yes as the turbo is rated at 1650hp.... but it simply won't last. Decide how often you want to pull the motor apart.... weekly or annually.
At that point just get an LSX block.
Champagne dreams.... on a Boone's Strawberry Hill budget.... keep it around 1100rwhp or you'll be changing head gaskets as a weekly tune up. A goal of running 8's is a very achievable feat. Trying for 7's you better have a deep f*cking wallet as things break..... often.
The LS9 motor I have runs a stock $100 Ls1 crank (376ci) and makes more power than I can use 1100rwhp. That's about the limits of the block/heads reliably. Can it make more.... yes as the turbo is rated at 1650hp.... but it simply won't last. Decide how often you want to pull the motor apart.... weekly or annually.
Launching!
Joined: Oct 2006
Posts: 201
Likes: 0
From: Grand Rapids, MI
Also, remember that turbo motors benefit greatly from a large stroke, but bigger bores yield very small gains compared to NA or nitrous combos. "No replacement for displacement" isn't always true in the turbo world. Just cram it in and give it a long lever to push on.
Jack
Disregarding strength issues of OEM iron blocks vs LSX or other aftermarket blocks, I would still keep the displacement smaller in a single turbo setup. I would try to stay at or below 400" unless you're talking about twins. Keeping the displacement small will give you so much more room to grow on the turbine side and leave you lots more options when choosing a turbo.
Also, remember that turbo motors benefit greatly from a large stroke, but bigger bores yield very small gains compared to NA or nitrous combos. "No replacement for displacement" isn't always true in the turbo world. Just cram it in and give it a long lever to push on.
Jack
Also, remember that turbo motors benefit greatly from a large stroke, but bigger bores yield very small gains compared to NA or nitrous combos. "No replacement for displacement" isn't always true in the turbo world. Just cram it in and give it a long lever to push on.
Jack
I don't mean to piggy back on the OP thread but this question has been in my head for a while as I too am going to be looking to go bigger from my s475/347 setup
Also, remember that turbo motors benefit greatly from a large stroke, but bigger bores yield very small gains compared to NA or nitrous combos. "No replacement for displacement" isn't always true in the turbo world. Just cram it in and give it a long lever to push on.
Jack
Jack
So Mr. Jack, would you say a standard bore on a 4.25 stroke would bee too much for a turbo app?