Trying to make 600 hp plus
Thread Starter
Teching In
Joined: Oct 2025
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Trying to make 600 hp plus I have a 408 stroker 6.0ls that I’m building right now im trying to make 600 plus hp I have a btr stage 4 cam,cnc ls3 heads ported,e85 with fic fuel injectors 850cc,ls7 lifters,gears3.45what else am I missing to make the 600plus
TECH Fanatic
Joined: Jul 2022
Posts: 1,032
Likes: 389
From: Alaska
Sell all those expensive, fragile parts.
Pull a stock 200,000 mile motor out of a $500 rusted out pickup truck.
Stack an inexpensive mid size turbocharger on the exhaust manifold, Push 12 pounds of manifold pressure: Boom 600 horspower the easy way
Pull a stock 200,000 mile motor out of a $500 rusted out pickup truck.
Stack an inexpensive mid size turbocharger on the exhaust manifold, Push 12 pounds of manifold pressure: Boom 600 horspower the easy way
Don't have any idea what the specs are on a BTR stage 4 cam. I HATE stages. One person's stage 2 is another person's stage 1. Better to learn cam specs, and what they mean. Most of us aren't going to run to Google and see what BTR stage 4 specs are, then run back here to give their opinion. Please post your cams specs, and we can go from there. Stages are for Broadway plays......
Which LS3 heads are you talking about? Ported oem LS3 heads? If so, it's going to be a disappointment. If you want big power in that combo, my #1 choice would be GPI Max 2.0 small bore LS7 heads followed by Brodix BR1 Cathedrals. If you want to stay LS3 architecture either Mast LS3 heads or Truck Flow 255's ported both work very well and will support 600+hp.
10 Second Club
Joined: Aug 2010
Posts: 4,465
Likes: 192
From: Harford Co. Maryland
Don't have any idea what the specs are on a BTR stage 4 cam. I HATE stages. One person's stage 2 is another person's stage 1. Better to learn cam specs, and what they mean. Most of us aren't going to run to Google and see what BTR stage 4 specs are, then run back here to give their opinion. Please post your cams specs, and we can go from there. Stages are for Broadway plays......
BTR Stage 4 Truck Cam V2 BTR32430090
Fits 1999-2013 GM LS-Based Engines 4.8L 5.3L 6.0L 6.2L
224/230 .553/.553" 109LSA, 3 Bolt Pattern
----------------------------------------------------------------------
This one I like...
BTR LS3 Stage 4 Camshaft v2
Camshaft Duration: 233/25X
Valve Lift with Factory Rocker Arm Ratio: 0.636 int./0.636 exh.
Lobe Separation (degrees): 113
Camshaft Gear Attachment: 3-bolt
-------------------------------------------------------------------
BTR Stage 4 Naturally Aspirated v2 Camshaft For LS7 Engines
Camshaft Duration: 246/26X
Valve Lift with Factory Rocker Arm Ratio: 0.662 int./0.662 exh.
Lobe Separation (degrees): 111
Camshaft Gear Attachment: 3-bolt
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Thread Starter
Teching In
Joined: Oct 2025
Posts: 2
Likes: 0
Don't have any idea what the specs are on a BTR stage 4 cam. I HATE stages. One person's stage 2 is another person's stage 1. Better to learn cam specs, and what they mean. Most of us aren't going to run to Google and see what BTR stage 4 specs are, then run back here to give their opinion. Please post your cams specs, and we can go from there. Stages are for Broadway plays......
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TECH Resident
Joined: Sep 2019
Posts: 819
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From: Melbourne, Australia
On my lsx454 I had ported ls3 heads, lsxr intake, 102mm throttle body , btr 239/254 cam, on 93 gas . It made 536rwhp
Went to mamo Tfs260 ls7 heads, mamo atomic intake, commotion 255/269 solid roller cam , on 93 gas it made 649rwhp
on e85 it made 683rwhp
The latest works I had mamo go his biggest on the heads, titanium valves, jesel keyway lifters, Mamo specced 258/272 solid roller cam on 93 gas it makes 671rwhp N/A on e85 it makes 707rwhp N/A
Ls3 heads are lazy, you’ll need a huge cam, and still won’t get 600
Better heads, great intake, big cam should get u there. Talk to Tony
Went to mamo Tfs260 ls7 heads, mamo atomic intake, commotion 255/269 solid roller cam , on 93 gas it made 649rwhp
on e85 it made 683rwhp
The latest works I had mamo go his biggest on the heads, titanium valves, jesel keyway lifters, Mamo specced 258/272 solid roller cam on 93 gas it makes 671rwhp N/A on e85 it makes 707rwhp N/A
Ls3 heads are lazy, you’ll need a huge cam, and still won’t get 600
Better heads, great intake, big cam should get u there. Talk to Tony
Joined: Apr 2006
Posts: 3,890
Likes: 1,137
From: Grand Rapids, Michigan
I have the BTR Stage 4 LS3 in my Camaro. Stock heads, ported rod mod LS3 intake. Made 473 to the wheels. You're going to need a bigger cam to hit 600 with larger displacement, plus way better heads.
On my lsx454 I had ported ls3 heads, lsxr intake, 102mm throttle body , btr 239/254 cam, on 93 gas . It made 536rwhp
Went to mamo Tfs260 ls7 heads, mamo atomic intake, commotion 255/269 solid roller cam , on 93 gas it made 649rwhp
on e85 it made 683rwhp
The latest works I had mamo go his biggest on the heads, titanium valves, jesel keyway lifters, Mamo specced 258/272 solid roller cam on 93 gas it makes 671rwhp N/A on e85 it makes 707rwhp N/A
Ls3 heads are lazy, you’ll need a huge cam, and still won’t get 600
Better heads, great intake, big cam should get u there. Talk to Tony
Went to mamo Tfs260 ls7 heads, mamo atomic intake, commotion 255/269 solid roller cam , on 93 gas it made 649rwhp
on e85 it made 683rwhp
The latest works I had mamo go his biggest on the heads, titanium valves, jesel keyway lifters, Mamo specced 258/272 solid roller cam on 93 gas it makes 671rwhp N/A on e85 it makes 707rwhp N/A
Ls3 heads are lazy, you’ll need a huge cam, and still won’t get 600
Better heads, great intake, big cam should get u there. Talk to Tony
My 01 car made 540 rwhp on 93 and some of the things that could have been done to reach 600 rwhp was to run a different fuel, lighter flywheel, an aluminum driveshaft and aluminum wheels.
My camshaft is a CamMotion 243/251 .661/.633 115+4
My camshaft is a CamMotion 243/251 .661/.633 115+4
Most importantly, get a high ram style and you'll make big HP and still have tq with the stroker. Imo, long runner stock alike intake are wrong for anything thats too modified or chasing a number.
Still don't know exhaust duration.....I ran a Cam Motion in my LS7, ground to Alan Futral's specs. 232°/250° duration, .603"/.608" lift, on a 112° LSA, so it was easier on the valvetrain
. Worked until #7 exhaust lobe took a dump, 2nd CM cam that failed on that same #7 exhaust lobe. It was improper heat treat that caused the 2nd failure, and probably the first, too. I know, because I checked the lobe on our Rc tester. 32Rc isn't gonna cut it for hardness. Cam had plenty of low end and midrange, but remember, not apples to apples as my engine is a 427, though a 408 is pretty close......
. Worked until #7 exhaust lobe took a dump, 2nd CM cam that failed on that same #7 exhaust lobe. It was improper heat treat that caused the 2nd failure, and probably the first, too. I know, because I checked the lobe on our Rc tester. 32Rc isn't gonna cut it for hardness. Cam had plenty of low end and midrange, but remember, not apples to apples as my engine is a 427, though a 408 is pretty close......Last edited by grinder11; Oct 26, 2025 at 11:16 AM.
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Joined: Aug 2010
Posts: 4,465
Likes: 192
From: Harford Co. Maryland
Lots of combos out there... Tusky's Cookbook~All motor builds - LS1TECH - Camaro and Firebird Forum Discussion
here's one... 403” N/A build… - Page 2 - LS1TECH - Camaro and Firebird Forum Discussion
And scroll to post 21 for results
here's one... 403” N/A build… - Page 2 - LS1TECH - Camaro and Firebird Forum Discussion
And scroll to post 21 for results