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Generation IV Internal Engine
2005-2010 LS2 | LS3 | LS7 | L92 | LS9
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Old 09-30-2010, 09:43 PM   #1
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Default how much cubic inch can you get out of a 6.0?

Just what the title says,if this has been gone over before im sorry i cant find it.
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Old 09-30-2010, 09:48 PM   #2
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Realiably? Iron or aluminum?
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Old 09-30-2010, 09:54 PM   #3
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I think it can go to 407 or 408. Im not 100 percent on that though.
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Old 09-30-2010, 09:56 PM   #4
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Quote:
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Realiably? Iron or aluminum?
Iron. streetable?
My brother has a 88z28 with a gen 1 408 with afr heads not to streetable tho.Im tring to convince him that Ls is the way to go. With L92 or whats a good atermarket head? His goal is 600hp @ flywheel
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Old 09-30-2010, 10:55 PM   #5
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6.0 (LS2 or LQ4/9) can go to 402 inches, and 408 inches. 402 is stock 4.0" bore, with a stroker crank taking stroke to 4.0". 408 is a +.030 overbore, with the same crank. Very reliable from what I've seen. Stroke is a little long compared to the length of the bore, as the stroke makes you use a shorter piston, putting more of the piston closer to the bottom of the bore at bottom dead center. So be careful with power adders.

600 fwhp is doable N/A with a 402/8. There are several routes you can take, L92 heads will do if ported with a nice intake/tb and LT's. Gonna take a stout cam to do it, I'd contact Pat G on here for a custom grind. Or you could go with an aftermarket head from one of the sponsors to the right, Texas Speed, Va Speed, etc. Trick Flow, AFR, Mast Motorsports, all make great heads that flow a ton. I can't speak for streetability due to lack of experience, but I'm sure someone will follow up with that info. I would imagine that a large enough cam to make that kind of power could be slightly peaky and lose some low end torque, but I'm not positive on that. I have seen the newer EPS grinds make outstanding peak power and still maintain torque. Anybody else got anything to add?

Hope this helps ya.

-Josh-

Last edited by Slamdsdime; 09-30-2010 at 11:01 PM..
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Old 09-30-2010, 10:57 PM   #6
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414 is a .60 over 6.0 with 4" crank i think u can do a 422 with a 6.0 block if that answers your question
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Old 09-30-2010, 11:22 PM   #7
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Mine is 438.
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Old 09-30-2010, 11:58 PM   #8
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Mine is 438.
yeah that sounds about right.

4.1 bore and 4.125 stroke i believe. Only bad thing is like mentioned earlier. The bores of the block are rather short and hard on the skirts since they come so far out of the block.
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Old 10-01-2010, 12:16 AM   #9
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If his goal is 600 crank hp, then he could probably stick with stock cubes. The right cam, ported L92's, and a FAST 102 or ported LS3/L67 intake should do it. Carcraft made 550hp with stock L92's and a cam that was pretty mild. (I think it was a 228/230 cam with high 500's lift.)

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Old 10-01-2010, 08:58 PM   #10
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Mine is 427". Iron block filled to the waterpump ports with Hardblok and bored to 4.07". 4.100" crank. Streetability is all in the tune. Mine will loaf along in 6th gear at 1700rpm all day with minor surging below 2% throttle. Just give it a bit more pedal and it smoothes right out.
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Old 10-02-2010, 11:09 AM   #11
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Thanks guys.He just sold his 408 last nite,so soon as we find a block we will start.I will take pics and keep you guys updated.Think you guys can post bore and stroke combos?I think alot of people are going in this direction.
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Old 10-02-2010, 11:17 AM   #12
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How can you get 454ci out of a lsx block from gmpp?What different From a 6.0 to a lsx besides the casting is stronger? It says 4.200 max bore. So whats the max bore on a 6.0 ?
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Old 10-02-2010, 12:54 PM   #13
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The LSX block has thicker cylinder walls, and you can also get it in different deck heights.
Going .60 over on a 6.0 block, I would definitely get is sonically checked for integrity.
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Old 10-02-2010, 02:04 PM   #14
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Quote:
Originally Posted by slamdsdime View Post
6.0 (ls2 or lq4/9) can go to 402 inches, and 408 inches. 402 is stock 4.0" bore, with a stroker crank taking stroke to 4.0". 408 is a +.030 overbore, with the same crank. Very reliable from what i've seen. Stroke is a little long compared to the length of the bore, as the stroke makes you use a shorter piston, putting more of the piston closer to the bottom of the bore at bottom dead center. So be careful with power adders.

600 fwhp is doable n/a with a 402/8. There are several routes you can take, l92 heads will do if ported with a nice intake/tb and lt's. Gonna take a stout cam to do it, i'd contact pat g on here for a custom grind. Or you could go with an aftermarket head from one of the sponsors to the right, texas speed, va speed, etc. Trick flow, afr, mast motorsports, all make great heads that flow a ton. I can't speak for streetability due to lack of experience, but i'm sure someone will follow up with that info. I would imagine that a large enough cam to make that kind of power could be slightly peaky and lose some low end torque, but i'm not positive on that. I have seen the newer eps grinds make outstanding peak power and still maintain torque. Anybody else got anything to add?

Hope this helps ya.

-josh-
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Old 10-02-2010, 02:09 PM   #15
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I am not meaning to hijack a thread, but I dont want to make a new thread for this(It is on topic of this thread). I am not intending on running a massive amount of boost or Nitrous. At most, a 100 shot with no boost. For my goals, would it make sense to go to an iron 408 or just stroke my LS2 block. FWIW, I do plan on a nice H/C setup in the short future. Possibly even H/C/I, if that matters.
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Old 10-02-2010, 02:37 PM   #16
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Quote:
Originally Posted by JustAnotherLS2 View Post
I am not meaning to hijack a thread, but I dont want to make a new thread for this(It is on topic of this thread). I am not intending on running a massive amount of boost or Nitrous. At most, a 100 shot with no boost. For my goals, would it make sense to go to an iron 408 or just stroke my LS2 block. FWIW, I do plan on a nice H/C setup in the short future. Possibly even H/C/I, if that matters.
If all you're going to run is a 100 shot, either route will work for you. Whichever you can do for cheaper. Just remember, the aluminum block will save you 90 lbs. over the iron block.
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Old 10-03-2010, 11:36 AM   #17
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402 is the safest bet
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Old 10-03-2010, 05:13 PM   #18
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4.070" bore we typically see .200" cylinder wall thickness, which is considered a safe minimum. For heavy power adder you're better off with 4.030" bore size, .200" wall is fine for N/A, small nitrous.
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Old 10-03-2010, 07:04 PM   #19
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Quote:
Originally Posted by Pwebbz28 View Post
yeah that sounds about right.

4.1 bore and 4.125 stroke i believe. Only bad thing is like mentioned earlier. The bores of the block are rather short and hard on the skirts since they come so far out of the block.
4.125 bore and 4.100 stroke
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Old 10-05-2010, 02:45 PM   #20
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We generally build 4.030" bore iron blocks at most for customers. I've had a 4.060 without any issues in my personal builds. You could go a 4.100 stroke & 4.030 bore & have a nice street motor!
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