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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 06-23-2013, 02:59 PM   #1
Trob85
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Gmpp cnc ls3 heads

Wanting to know if anyone is running these. For what I'm looking to do this might be my best route. Running stock cubes with d1 Procharger making 900 hp. I know the boost will dictate the power but I don't need a super custom cnc job just a little more air flow to free up the n/a power so I can run less boost lets hear some pros or cons.





http://www.jegs.com/webapp/wcs/store...=&pgGrp=search
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Old 06-23-2013, 03:08 PM   #2
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What size cam.... seems like valve spring are not that good with

.550" max valve lift with installed springs

I had to go bigger with my cam
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Old 06-23-2013, 03:13 PM   #3
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I'm running the Lingenfelter gt9 cam I would just replace the springs with .675 prc set
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Old 06-23-2013, 03:51 PM   #4
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west coast heads. if you want a custom port polish and mill job on the heads go to the best and do it once
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Old 06-23-2013, 03:55 PM   #5
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That's what I'm saying I don't need a custom porting job just a little more air flow which these have.
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Old 06-23-2013, 03:58 PM   #6
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You're making 900 on a D1 on stock cubes and heads?

Uh, I'd like to see this setup... because I don't see it happening.
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Old 06-23-2013, 04:10 PM   #7
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OP do you mean that you WANT to make 900hp and are looking for heads?

Tell me more about your setup, I'm curious too sir.
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Old 06-23-2013, 04:10 PM   #8
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You don't need a huge displacement to make big power several guys I know are running the same setup forged internal 376 ci ls9 cam ported heads full exhaust 102 octane making 875 to 910 hp at the crank not the wheels
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Old 06-23-2013, 05:42 PM   #9
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Old 06-23-2013, 06:28 PM   #10
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Quote:
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You don't need a huge displacement to make big power several guys I know are running the same setup forged internal 376 ci ls9 cam ported heads full exhaust 102 octane making 875 to 910 hp at the crank not the wheels
I know what it takes, just wanting to see the op's setup.
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Old 06-23-2013, 06:36 PM   #11
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That was ment for 429 stock crank Callie's h beams wiseco -11 pistons d1sc ported heads Aeromotive fuel system running e85 stock intake and throttle body long tubes with 3 inch straight pipe no cats.
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Old 06-23-2013, 06:53 PM   #12
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I just put these on mine. Haven't driven it too much but does seem a little peppier ( if that's a word) for the little bit I have. I was on a time crunch to get my motor back together for a track day and went with these. One thing you will definitely need are the two rivets to plug the steam vents that will be at the back of the engine. I didn't realize this until I had mine all back together. And filling with antifreeze then started to hear the antifreeze dripping all over the place.
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Old 06-23-2013, 06:58 PM   #13
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What steam vents are you talking about the ones with that crossover pipe. Could you post up a picture.
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Old 06-23-2013, 07:46 PM   #14
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Quote:
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What steam vents are you talking about the ones with that crossover pipe. Could you post up a picture.
He's talking about the steam vents. The Ls heads have a steam/ coolant tubes at each end of the head and there are freeze plugs at the back, one on each side. They must be plugged or used and connected back to the coolant system. I reconnected all of mine to avoid any hot spots in the head since I was going to have 12.25 to 1 compression. I used the L98 truck crossovers and then t'd it to the front ones.
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Old 06-23-2013, 07:52 PM   #15
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Ok that's what thought that's no big deal didn't they block them off on our cars though I haven't pulled this engine apart yet I'm use to the lq4 so it had all of the pipes already.
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Old 06-23-2013, 08:27 PM   #16
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Yes they are blocked off. He probably just forgot to put them back.
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Old 06-23-2013, 08:36 PM   #17
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I'm tracking I might just go this route seems like not a lot of people have experience with them and 77and2010 hasn't had a problem worth a shot I guess unless anyone else knows a sponsor that wants to chime in about what makes there program better or members have any suggestions
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Old 06-23-2013, 09:13 PM   #18
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Hotrod magazine did an article on Rectangular port and GMPP heads held their own.

Have you considered the LsA heads which are cast differently and can handle the cylinder pressures better.
http://www.lingenfelter.com/mm5/merc...egory_Code=C40
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Old 06-23-2013, 10:32 PM   #19
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There are certainly better cnc ported head choices but probably not many for that kind of money. If your on a budget then they look like a good choice. In any case they are going to help your setup more than the factory heads. When you factor in selling your old heads they are really cheap because most places ask for a core. I would recommend LS9 head gaskets and ARP studs or at least ARP bolts when you put it back together. Should end up making at least 20RWHP with a loss of boost. Add the boost back and your probably looking at 40+RWHP. Post results when done.
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Old 06-24-2013, 06:13 AM   #20
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Quote:
Originally Posted by litle88 View Post
He's talking about the steam vents. The Ls heads have a steam/ coolant tubes at each end of the head and there are freeze plugs at the back, one on each side. They must be plugged or used and connected back to the coolant system. I reconnected all of mine to avoid any hot spots in the head since I was going to have 12.25 to 1 compression. I used the L98 truck crossovers and then t'd it to the front ones.
This. All the holes are open when they come out of the boxes. You either use them as Little88 said or plug them your self with the $6 rivets from GM.
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Old 06-24-2013, 06:37 AM   #21
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I considered lsa heads but every company I spoke with said the ls3 heads were fine for what I wanted to do I am going to run head studs and have the ls9 head gasket should put my compression with the heads at 9.23:1 which is perfect. One bad thing I will say about the lsa heads I'm having a hard time living with is, everywhere you look it cost roughly 1500 for a good cnc job with new valves and springs on an ls3 head, but for some reason lsa heads to get machined you can double that amount.
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Old 06-24-2013, 08:31 AM   #22
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It is expensive. And to me justifying that much then I'd just go with a TFS head which I know will handle anything thrown at it and being able to run larger cams and better flow.
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Old 06-24-2013, 09:13 AM   #23
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I've seen the GMPP heads before & they're nice. For the money there are plenty of better options IMHO, if you want to do cnc stock castings why not do the PRC cnc head exchange program? You send your heads in as cores & get ported ones back for under a grand! If your going to spend big $$ the only way to go would be the PRC 255 or 260 heads IMHO! 380cfm capable out of a head that has better p/v clearance, smaller chambers, virtually stock side runners for better velocity, and they can still use your stock rockers!

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Old 06-24-2013, 09:14 AM   #24
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255-260s
http://www.texas-speed.com/p-4008-pr...der-heads.aspx

exchange:
http://www.texas-speed.com/p-1388-pr...e-program.aspx
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Old 06-24-2013, 09:15 AM   #25
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^^^or this! For sure.
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