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Old 09-14-2013, 08:35 PM   #1
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Max hp 08 block can handle

I'm curious if anyone knows what the Max hp rating is on a stock block( I have 08 gt). I'm currently supercharged with a kenne bell and this winter I am going to save up for rotating assembly and any labour costs so I can push out the most hp my blower can handle. I would like to get around 600 rwhp.
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Old 09-14-2013, 08:58 PM   #2
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Quote:
Originally Posted by Edd204 View Post
I'm curious if anyone knows what the Max hp rating is on a stock block( I have 08 gt). I'm currently supercharged with a kenne bell and this winter I am going to save up for rotating assembly and any labour costs so I can push out the most hp my blower can handle. I would like to get around 600 rwhp.
Don't you think you should have asked this question before you put on a supercharger?
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Old 09-14-2013, 09:09 PM   #3
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No, I'm sitting fine and safe right now. But every winter I budget my mods for the next spring. So I would like to increase my hp, but if the block can't handle that hp then i will shoot for a short block if I absolutely need to.
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Old 09-14-2013, 09:20 PM   #4
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I'm not worried about the motor right now, I have a good safe tune by Lund , but I'm parking the car soon and every winter I budget for the nxt seasons mods and I wouldn't mind building up stronger motor for next summer.
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Old 09-14-2013, 09:20 PM   #5
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No, I'm sitting fine and safe right now. But every winter I budget my mods for the next spring. So I would like to increase my hp, but if the block can't handle that hp then i will shoot for a short block if I absolutely need to.
From what I've gathered, you should be fine for about 750!
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Old 09-14-2013, 09:27 PM   #6
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From what I've gathered, you should be fine for about 750!
Well that's good and thx for the input and if that is true I will just forge the internals
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Old 09-14-2013, 10:13 PM   #7
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I've heard meant times that the stick block can only take 450hp, then you are going to have to get forged internals and I would think about a new transmission
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Old 09-14-2013, 10:22 PM   #8
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Im not to worried about tranny yet. I've heard 450 but that's on internals , I'm concerned about the block . I'm planning on doing a tyranny rebuild kit on it at some point. When the tranny goes ill fix it then. This only my weekend car. I rarely even go into boost. This winter I'd liked to forge internals and upgrade fuel system. If tyranny goes ill deal with it then. If it was my dd I'd be concerned, but this is pretty much just my summer toy.
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Old 09-14-2013, 10:53 PM   #9
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I've done research on this.

Most average I've came across was 500ish rwhp.

Kind of one of reason I got a expensive transmission (after my stock blew up...) replacement to get ready for new block I am planning to get in the future once my stock motor decides to pass away on me. d:
I would be rebuilding a block with all goodies (cams, head gaskets, forged internals, etc.)
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Old 09-15-2013, 04:15 PM   #10
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From the research I've done it's not the blocks that are quitting at 500RWHP. It's the rotating assembly that lets go. A properly machined stock block will not be the limiting component.
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Old 09-15-2013, 04:24 PM   #11
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From the research I've done it's not the blocks that are quitting at 500RWHP. It's the rotating assembly that lets go. A properly machined stock block will not be the limiting component.
+1

People sometimes missread information on our engines. The limiting factor in our equation is rotating assembly, clutch and trans. The clutch will hold until about 500-525 rwhp and then It will begin to slip. A simple change to a stage 3/3+ exedy will hand more than what you need! As for the rotating assembly, crank is good to 450-500, rods are good to 500 and pistons are good to 500. The weakest part of these cars are the cheap cast crank. The block is "safe" to about 700-750 approx horsepower from what I hear. But hell, you will get different answers anywhere you go because some people have more bad luck then others. I've seen some hold to 800, and I've seen some crack right down the middle at 500. It depends on the engine and how its abused N/A and boosted. Myself, if you're doing turbo, go with a stroker 289/302 forged kit from eagle or MMR and you should be good to about 700-750 rwhp with a fairly low compression (9/9.5). I don't suggest a stroker with a twin screw application. Best of luck!
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