Moneypitts 2500HD 408 build
Jul 17, 2014 | 07:45 PM
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Moneypitts 2500HD 408 build
I figured I would start a build thread, I am planning a NA 408 build for my 03 2500hd CCSB. I am building the bottom end for nitrous and possible boost in the future, compression will be figured for NA with nitrous and if I do decide to go turbo or supercharger in the future I will change heads to adjust compression. I found a junk yard 2003 LQ4 that has piston slap for $650.00
The bad part was it is four hours from me, I went to try and get it today and made it almost there and got turned back because of a wildfire that is burning in the area where the auto wrecker is located. I hope this is not an omen for this build.
Homes burned, more threatened as Methow Valley fire grows | The Today File | Seattle Times
The bad part was it is four hours from me, I went to try and get it today and made it almost there and got turned back because of a wildfire that is burning in the area where the auto wrecker is located. I hope this is not an omen for this build.
Homes burned, more threatened as Methow Valley fire grows | The Today File | Seattle Times
Jul 17, 2014 | 10:46 PM
#3
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http://youtu.be/RpB3On9YDzE
http://youtu.be/nLmc2O6Yp-U
Last edited by Moneypitt; Jul 17, 2014 at 10:59 PM.
Jul 18, 2014 | 12:08 AM
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So the build so far is planned for:
Manley LS Rotating Assembly, 408 cid.
PRC L92 CNC Ported Heads.
FAST LSXR 102mm LS3 Intake Manifold with 102mm Throttle Body and fuel rail kit.
New headers and exhaust needs figured out.
Custom cam shaft, looking at Straub Custom Camshafts.
Need to figure out fuel upgrades.
First order of business is I need to figure out what pistons would be best to go with to be able to lower my compression ratio in the future by changing the heads if I decide to go FI, any ideas?
I plan on 92 octane pump gas.
Manley LS Rotating Assembly, 408 cid.
PRC L92 CNC Ported Heads.
FAST LSXR 102mm LS3 Intake Manifold with 102mm Throttle Body and fuel rail kit.
New headers and exhaust needs figured out.
Custom cam shaft, looking at Straub Custom Camshafts.
Need to figure out fuel upgrades.
First order of business is I need to figure out what pistons would be best to go with to be able to lower my compression ratio in the future by changing the heads if I decide to go FI, any ideas?
I plan on 92 octane pump gas.
Jul 18, 2014 | 12:57 AM
#5
How much boost do you want to run in the future? I would put -15cc dish pistons in there and get your LS3 heads down to 65cc or so. That should put your compression at 10.5:1 NA. Then when you boost it, you can throw some 72cc chambers on there and have a 9.7:1 boost motor.
Jul 18, 2014 | 10:42 AM
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How much boost do you want to run in the future? I would put -15cc dish pistons in there and get your LS3 heads down to 65cc or so. That should put your compression at 10.5:1 NA. Then when you boost it, you can throw some 72cc chambers on there and have a 9.7:1 boost motor.
I Don't really know, I might not even go boosted. I just want to make sure I don't screw up on my piston choice and make it harder to go that route if I ever decide to. So you think a 10.5:1 compression would be the best for NA on 92 pump gas?
Jul 18, 2014 | 12:07 PM
#7
No I think 11.0:1 static would be best in NA form on pump gas but if it was my truck and I knew I might want to go boosted, I would make the compromise and run it at 10.5. You might not even notice the difference between the two.
Don't make the same mistake as me when I built my 408. I ran -3cc flat top wiseco pistons. With my LS3 heads and the gasket I ran, I was running 11.4:1 compression NA. It ran really good. There was torque everywhere. But I was screwed if I ever wanted to put boost through it. Yea I could run 10lbs on it but that gets old after a while.
I just did some math and figured with -15cc dish pistons, a cometic 4.060 bore 0.040" thickness head gasket, 65cc combustion chambers, and the piston 0.010" out of the hole, you would be sitting at 10.7:1 static. Then if you boost it, you could throw some 72cc chamber heads on it, and LS9 head gaskets, you could drop a full point of compression. 9.7:1 would be great for boost. That is about as good as it gets for compromise.
Don't make the same mistake as me when I built my 408. I ran -3cc flat top wiseco pistons. With my LS3 heads and the gasket I ran, I was running 11.4:1 compression NA. It ran really good. There was torque everywhere. But I was screwed if I ever wanted to put boost through it. Yea I could run 10lbs on it but that gets old after a while.
I just did some math and figured with -15cc dish pistons, a cometic 4.060 bore 0.040" thickness head gasket, 65cc combustion chambers, and the piston 0.010" out of the hole, you would be sitting at 10.7:1 static. Then if you boost it, you could throw some 72cc chamber heads on it, and LS9 head gaskets, you could drop a full point of compression. 9.7:1 would be great for boost. That is about as good as it gets for compromise.
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Jul 18, 2014 | 07:41 PM
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No I think 11.0:1 static would be best in NA form on pump gas but if it was my truck and I knew I might want to go boosted, I would make the compromise and run it at 10.5. You might not even notice the difference between the two.
Don't make the same mistake as me when I built my 408. I ran -3cc flat top wiseco pistons. With my LS3 heads and the gasket I ran, I was running 11.4:1 compression NA. It ran really good. There was torque everywhere. But I was screwed if I ever wanted to put boost through it. Yea I could run 10lbs on it but that gets old after a while.
I just did some math and figured with -15cc dish pistons, a cometic 4.060 bore 0.040" thickness head gasket, 65cc combustion chambers, and the piston 0.010" out of the hole, you would be sitting at 10.7:1 static. Then if you boost it, you could throw some 72cc chamber heads on it, and LS9 head gaskets, you could drop a full point of compression. 9.7:1 would be great for boost. That is about as good as it gets for compromise.
Don't make the same mistake as me when I built my 408. I ran -3cc flat top wiseco pistons. With my LS3 heads and the gasket I ran, I was running 11.4:1 compression NA. It ran really good. There was torque everywhere. But I was screwed if I ever wanted to put boost through it. Yea I could run 10lbs on it but that gets old after a while.
I just did some math and figured with -15cc dish pistons, a cometic 4.060 bore 0.040" thickness head gasket, 65cc combustion chambers, and the piston 0.010" out of the hole, you would be sitting at 10.7:1 static. Then if you boost it, you could throw some 72cc chamber heads on it, and LS9 head gaskets, you could drop a full point of compression. 9.7:1 would be great for boost. That is about as good as it gets for compromise.
This is the rotating assem I am looking at with the ARP2000 rod bolts.
LS Rotating Assembly-Manley, 408 cid, 4.030x4.000, Forged Crank, H-beam rod, Pis - USA Performance Parts