GMPP 364/440 vs LS2
Thread Starter
Le Mans Master
Joined: Nov 2009
Posts: 6,882
Likes: 234
From: Bangkok, Thailand
GMPP 364/440 vs LS2
So, if the GMPP crate engine used the smaller 500 lift cam but made 440hp/410tq, doesn't it follow that the stock LS2 in our cars with the bigger (01 LS6 cam) would make more power than that?
Borrowed from a necrotic post by user "Buffy"
The GMPP catalog shows it the same as the LS1 cam:
Under "LS Crate Engines" (pp 64 - 72):
engine PN HP lift duration
LS1 17801267 350 .500/.500 200/203
LS6 17801268 405 .525/.525 204/211
LS2 19156261 400 .500/.500 200/203
The fact that the crate engine was rated at 6000 max rpm jives with the small cam in the larger 364" engine. I know my old LS1 C5 went dead flat at 5000 rpm. It didn't fall off, but it didn't make more power either.
Or, is it that the head porting we don't get from the factory makes the difference? From another site:
To maximize the amount of air that flows into the LS 364, Chevrolet Performance Parts engineers CNC-ported the intake runners on the heads to 250cc-a 40cc increase over the standard LS6 heads. They also ported the D-shaped exhaust ports to 85cc for a 15cc increase over the standard ports.
Seems like the "fact" that the LS2 isn't under rated isn't so factual.
Borrowed from a necrotic post by user "Buffy"
The GMPP catalog shows it the same as the LS1 cam:
Under "LS Crate Engines" (pp 64 - 72):
engine PN HP lift duration
LS1 17801267 350 .500/.500 200/203
LS6 17801268 405 .525/.525 204/211
LS2 19156261 400 .500/.500 200/203
The fact that the crate engine was rated at 6000 max rpm jives with the small cam in the larger 364" engine. I know my old LS1 C5 went dead flat at 5000 rpm. It didn't fall off, but it didn't make more power either.
Or, is it that the head porting we don't get from the factory makes the difference? From another site:
To maximize the amount of air that flows into the LS 364, Chevrolet Performance Parts engineers CNC-ported the intake runners on the heads to 250cc-a 40cc increase over the standard LS6 heads. They also ported the D-shaped exhaust ports to 85cc for a 15cc increase over the standard ports.
Seems like the "fact" that the LS2 isn't under rated isn't so factual.
Drifting
Joined: Aug 2022
Posts: 1,509
Likes: 429
From: Ruskin, FL
So, if the GMPP crate engine used the smaller 500 lift cam but made 440hp/410tq, doesn't it follow that the stock LS2 in our cars with the bigger (01 LS6 cam) would make more power than that?
Borrowed from a necrotic post by user "Buffy"
The GMPP catalog shows it the same as the LS1 cam:
Under "LS Crate Engines" (pp 64 - 72):
engine PN HP lift duration
LS1 17801267 350 .500/.500 200/203
LS6 17801268 405 .525/.525 204/211
LS2 19156261 400 .500/.500 200/203
The fact that the crate engine was rated at 6000 max rpm jives with the small cam in the larger 364" engine. I know my old LS1 C5 went dead flat at 5000 rpm. It didn't fall off, but it didn't make more power either.
Or, is it that the head porting we don't get from the factory makes the difference? From another site:
To maximize the amount of air that flows into the LS 364, Chevrolet Performance Parts engineers CNC-ported the intake runners on the heads to 250cc-a 40cc increase over the standard LS6 heads. They also ported the D-shaped exhaust ports to 85cc for a 15cc increase over the standard ports.
Seems like the "fact" that the LS2 isn't under rated isn't so factual.
Borrowed from a necrotic post by user "Buffy"
The GMPP catalog shows it the same as the LS1 cam:
Under "LS Crate Engines" (pp 64 - 72):
engine PN HP lift duration
LS1 17801267 350 .500/.500 200/203
LS6 17801268 405 .525/.525 204/211
LS2 19156261 400 .500/.500 200/203
The fact that the crate engine was rated at 6000 max rpm jives with the small cam in the larger 364" engine. I know my old LS1 C5 went dead flat at 5000 rpm. It didn't fall off, but it didn't make more power either.
Or, is it that the head porting we don't get from the factory makes the difference? From another site:
To maximize the amount of air that flows into the LS 364, Chevrolet Performance Parts engineers CNC-ported the intake runners on the heads to 250cc-a 40cc increase over the standard LS6 heads. They also ported the D-shaped exhaust ports to 85cc for a 15cc increase over the standard ports.
Seems like the "fact" that the LS2 isn't under rated isn't so factual.
I've not put a large cam in my LS2, but my experience tells me doing so would yield very little gain.
Thread Starter
Le Mans Master
Joined: Nov 2009
Posts: 6,882
Likes: 234
From: Bangkok, Thailand
Why do you say that? LS engines respond very well to cam changes.
Drifting
Joined: Aug 2022
Posts: 1,509
Likes: 429
From: Ruskin, FL
It's based on my experience building LS motors.
LS3 in my 5th Gen Camaro SS. Changed the cam and upper valve train. Saw very very VERY mild gains on the dyno (With a good tune). Pulled the heads, port matched them. Enlarged and swirled the combustion chambers and saw HUGE gains. Over 100hp/110ft lbs.
In my '01 Vette LS1. I started with a cam and saw very much the same pattern. In the end I used a set of aftermarket heads.
For my '79 Trans Am I built a carbureted LS from the ground up. It was blue printed and balanced and produces a heck of a lot more power than either of the above Chevy's.
Overall it doesn't matter how much you open a valve or how long you hold it open, unless that's the only thing holding back the power.
It follows the old paper HP game.
Just my $0.02.
LS3 in my 5th Gen Camaro SS. Changed the cam and upper valve train. Saw very very VERY mild gains on the dyno (With a good tune). Pulled the heads, port matched them. Enlarged and swirled the combustion chambers and saw HUGE gains. Over 100hp/110ft lbs.
In my '01 Vette LS1. I started with a cam and saw very much the same pattern. In the end I used a set of aftermarket heads.
For my '79 Trans Am I built a carbureted LS from the ground up. It was blue printed and balanced and produces a heck of a lot more power than either of the above Chevy's.
Overall it doesn't matter how much you open a valve or how long you hold it open, unless that's the only thing holding back the power.
It follows the old paper HP game.
Just my $0.02.
