Stock heads for 600hp
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Teching In
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Stock heads for 600hp I have a l99 from a 10 camaro, im gonna stroke it to 416ci, im wanting to get to 600hp at the crank n/a, im wondering with the stroker kit an aggressive cam and better intake if i can get that kind of power qith the factory 823 heads, im getting rid of the garbage vvt to make it a ls3, so ive read a few places i can possibly get 620hp with the factory heads with new springs and stuff. Can anyone vouch for that or is that stretching the limits. I was gonna get a set of ls7 spec trick flow heads, but if a can save that money and still get the performance then i figured i should try right.
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Cam! You have the size.
Btw:
TFS ls7 heads should be done later. .065 bore is close for the exhaust .....1.59 valve or less my be needed depending on how TFS set up there valve spacing. They've ran rhs ls7 heads on a stock ls3 with 2.20/1.600 valves.....spacing. Or port the factory ls3 heads < best idea.
Btw:
TFS ls7 heads should be done later. .065 bore is close for the exhaust .....1.59 valve or less my be needed depending on how TFS set up there valve spacing. They've ran rhs ls7 heads on a stock ls3 with 2.20/1.600 valves.....spacing. Or port the factory ls3 heads < best idea.
Last edited by Smokey B; Apr 4, 2019 at 11:20 AM.
416 with ported 823, Cam, headers and rest of the exhuast, CAI, tune, and stock LS3 intake will get you to 600hp with no problem. A radius rod mod and/or porting would be better and is not that much of a price increase, but not necessary.
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Teching In
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Originally Posted by Bigshrek64
So if i just port and polish the factory heads it should be able to do 600hp depending on cam and intake.
With Cnc ls3 stock castings. Should be able to find the thread by his name. He does not post much.
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Launching!
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From: Attica, IN
I was going to go with Mast medium bore 255 heads for my low lash solid roller but couldn’t get through to anyone from there. Started talking with one of the guys from Frankenstein and ended up going with their stage 2 CNC program for that they have for the factory castings. I’m hoping to reach 550-575 with my 13:1 377”. I see no reason why you shouldn’t be able to reach your goal.
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Funny chris frank ls3 heads.. i wonder how they''ll do..don't tell me i'm being funny.
what does your cam look like & what intake?***<
BTW ... the more lift the more power! i hear they are a decent head for hp...sarcastically said. lol.
Know of 1 with a stock ls3 with ls3 ported heads by FED made 540+ with a llsr and 11' ish compression.
600 @ the rear is possible with a manual, your compression, with rpm
what does your cam look like & what intake?***<
BTW ... the more lift the more power! i hear they are a decent head for hp...sarcastically said. lol.
Know of 1 with a stock ls3 with ls3 ported heads by FED made 540+ with a llsr and 11' ish compression.
600 @ the rear is possible with a manual, your compression, with rpm
Last edited by Smokey B; Apr 7, 2019 at 04:07 AM.
Launching!
Joined: Jan 2012
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From: Attica, IN
Funny chris frank ls3 heads.. i wonder how they''ll do..don't tell me i'm being funny.
what does your cam look like & what intake?***<
BTW ... the more lift the more power! i hear they are a decent head for hp...sarcastically said. lol.
Know of 1 with a stock ls3 with ls3 ported heads by FED made 540+ with a llsr and 11' ish compression.
600 @ the rear is possible with a manual, your compression, with rpm
what does your cam look like & what intake?***<
BTW ... the more lift the more power! i hear they are a decent head for hp...sarcastically said. lol.
Know of 1 with a stock ls3 with ls3 ported heads by FED made 540+ with a llsr and 11' ish compression.
600 @ the rear is possible with a manual, your compression, with rpm
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cam looks to be around 7200 - 7400ish & Steven knows his stuff...
more Lift is required with a larger port. And they want and like lift, even with the stg1 program .730 lift cam & ported 4500 super vic used. Trust me. Fill the void with air and fuel. More is better = .700+ lift. Runner air speed already Sucks to begin with. So having or getter more air in under the curtain requires higher lifts for a larger csa ls3 runner VS a smaller port. >This is a general rule of thumb for any person wanting to get more with a ported ls3 head. I believe You'll get you intended goal. 4.11 + gear?
more Lift is required with a larger port. And they want and like lift, even with the stg1 program .730 lift cam & ported 4500 super vic used. Trust me. Fill the void with air and fuel. More is better = .700+ lift. Runner air speed already Sucks to begin with. So having or getter more air in under the curtain requires higher lifts for a larger csa ls3 runner VS a smaller port. >This is a general rule of thumb for any person wanting to get more with a ported ls3 head. I believe You'll get you intended goal. 4.11 + gear?
Launching!
Joined: Jan 2012
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From: Attica, IN
cam looks to be around 7200 - 7400ish & Steven knows his stuff...
more Lift is required with a larger port. And they want and like lift, even with the stg1 program .730 lift cam & ported 4500 super vic used. Trust me. Fill the void with air and fuel. More is better = .700+ lift. Runner air speed already Sucks to begin with. So having or getter more air in under the curtain requires higher lifts for a larger csa ls3 runner VS a smaller port. >This is a general rule of thumb for any person wanting to get more with a ported ls3 head. I believe You'll get you intended goal. 4.11 + gear?
more Lift is required with a larger port. And they want and like lift, even with the stg1 program .730 lift cam & ported 4500 super vic used. Trust me. Fill the void with air and fuel. More is better = .700+ lift. Runner air speed already Sucks to begin with. So having or getter more air in under the curtain requires higher lifts for a larger csa ls3 runner VS a smaller port. >This is a general rule of thumb for any person wanting to get more with a ported ls3 head. I believe You'll get you intended goal. 4.11 + gear?
Launching!
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From: Attica, IN
So you’re saying go with the stage 1? Goal is to go bottom 10’s on motor. Still new to the ls3 stuff. So I’m still learning about them as the build goes on. I’ve always done ls1/2 cathedral stuff.
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Teching In
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Wow....that is so much spec specific info. But still good. Im running 30" tires in the rear with most likely a 3.73 gear, i using a 4l80e trans, im selling the 6spd that came with the wrecked camaro i got the engine from. My usage is 80% highway/street driving and the other 20% being tearing up sideroads and the occasional track.
Launching!
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From: Attica, IN
Wow....that is so much spec specific info. But still good. Im running 30" tires in the rear with most likely a 3.73 gear, i using a 4l80e trans, im selling the 6spd that came with the wrecked camaro i got the engine from. My usage is 80% highway/street driving and the other 20% being tearing up sideroads and the occasional track.
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From: Coast of San Mateo County Between Pacifica & HMB
Or MMS LS3 Heads AFR Version and make 700+ Crank, 600+ RWHP with your cam, intake & CI.
My MMS LS3 Heads Flow, 302 CFM @ .400", 351 CFM @ .500", 383 CFM @ .600", 389 CFM @ .700"
With a 73-68% E/I Ratio
My MMS LS3 Heads Flow, 302 CFM @ .400", 351 CFM @ .500", 383 CFM @ .600", 389 CFM @ .700"
With a 73-68% E/I Ratio
Launching!
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From: Attica, IN
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You name it a factory ported Ls3 has done it. Most cry about Tq....... too lame to consider a re gear for what you've got with heads and cam. Or use a shorter duration cam. Rule of thumb still applies, with getting air in under the curtain. That's y most of these intakes suck. The ls3 has some area in size for port area. So how do you fill a larger void? Lift. Generally speaking most to all >intakes< Hinder flow with a head that >needs< lift* so more air is tooken in to fill the larger runner.
Sidenote:
If you really want to know, it's Honestly a waste to buy a aftermarket ls3 head @ a high cost. They shrunk the port. So what? Use a smaller cam to help. Heck U can get 11"degree ls3 heads for 800 bucks bare.
Factory Ls3 heads have covered anything a money man has done cheaper. U can't beat that.
890+ hp Lq4 4.100 bore x 4.0 stroke, comp 14:8+
790 - 800 hp 376ci Ls3 12:5 comp
800+hp 416 ls3- 13.2 comp. 8.8 sec !/4mile 1.3x 60ft. 2780lbs
550 rwhp stock Ls3 with FED heads & llsr
i have a 4l80e. Wait till you need a 8 inch stall & i have the stg1 heads and a 260/272 cam with .730 lift. If i wanted less rpm i'd shorten the duration, But Keep the Lift. Springs and cost....as the head can use it mean lift..
Sidenote:
If you really want to know, it's Honestly a waste to buy a aftermarket ls3 head @ a high cost. They shrunk the port. So what? Use a smaller cam to help. Heck U can get 11"degree ls3 heads for 800 bucks bare.
Factory Ls3 heads have covered anything a money man has done cheaper. U can't beat that.
890+ hp Lq4 4.100 bore x 4.0 stroke, comp 14:8+
790 - 800 hp 376ci Ls3 12:5 comp
800+hp 416 ls3- 13.2 comp. 8.8 sec !/4mile 1.3x 60ft. 2780lbs
550 rwhp stock Ls3 with FED heads & llsr
i have a 4l80e. Wait till you need a 8 inch stall & i have the stg1 heads and a 260/272 cam with .730 lift. If i wanted less rpm i'd shorten the duration, But Keep the Lift. Springs and cost....as the head can use it mean lift..
Last edited by Smokey B; Apr 7, 2019 at 10:14 PM.