LS376/480 cam in a LS3
Thread Starter
Drifting
Joined: Jul 2003
Posts: 1,868
Likes: 294
From: West of Burlington, Ontario Canada
LS376/480 cam in a LS3
The GM performance parts catalog has a LS376/480 which is essentially the stock version of the LS3 with the 88958733 Hot Cam (what GM calls it) and advertises 50 more HP and 51 Lbs. more torque. These are pretty impressive numbers for a cam swap alone and I was wondering if anybody has tried this cam. My concerns would be if a tune would be necessary (I think it probably is) and will it pass emissions later? Does anybody have any thoughts. I did a search and didn't find anything on the LS Hot cam.
Thanks
Jim
Thanks
Jim
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
"User Note: The GM Performance Parts LS 376/480 crate engine (19171224) comes equipped with the LS Hot Cam
(88958733) which is an aggressive high performance camshaft that may cause slight surging below 2500 rpm under
light load. This should be considered a normal functioning occurrence given the aggressive nature of the LS Hot
Cam. This surging can be avoided by increasing either the rpm or throttle of the engine at the same given velocity.
Under full throttle usage, you should not experience any surging when using a GMPP engine control system
designed for the LS376/480."
Cam specs are:
.525"I/.525"E
219*I/228*E
112LSA
Compared to the LS7 cam:
.593"I/.588"E
211*I/230*E
(88958733) which is an aggressive high performance camshaft that may cause slight surging below 2500 rpm under
light load. This should be considered a normal functioning occurrence given the aggressive nature of the LS Hot
Cam. This surging can be avoided by increasing either the rpm or throttle of the engine at the same given velocity.
Under full throttle usage, you should not experience any surging when using a GMPP engine control system
designed for the LS376/480."
Cam specs are:
.525"I/.525"E
219*I/228*E
112LSA
Compared to the LS7 cam:
.593"I/.588"E
211*I/230*E
Safety Car
Joined: Sep 2007
Posts: 3,502
Likes: 82
The GM performance parts catalog has a LS376/480 which is essentially the stock version of the LS3 with the 88958733 Hot Cam (what GM calls it) and advertises 50 more HP and 51 Lbs. more torque. These are pretty impressive numbers for a cam swap alone and I was wondering if anybody has tried this cam. My concerns would be if a tune would be necessary (I think it probably is) and will it pass emissions later? Does anybody have any thoughts. I did a search and didn't find anything on the LS Hot cam.
Thanks
Jim
Thanks
Jim
Burning Brakes
Joined: Dec 2006
Posts: 857
Likes: 0
From: Pooler GA
I have just put this Crate Motor in my 05 coupe, still getting use to it. It is drivable and as noted in the previous thread tends to surge a little at low RPM. Tuner put an initial tune that is a little rich to break it in and wanted me to bring it back in a couple of hundred miles to finnish the tune. It has a noticable cam lope to it and a guy in a new hemi Charger gave me the thumbs up as we drove passed each other in traffic this morning. I will be getting back to the tuner and a chassis dyno and let everyone know what the rear whell HP is?????
Safety Car
Joined: Jun 1999
Posts: 3,570
Likes: 3
From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
I have just put this Crate Motor in my 05 coupe, still getting use to it. It is drivable and as noted in the previous thread tends to surge a little at low RPM. Tuner put an initial tune that is a little rich to break it in and wanted me to bring it back in a couple of hundred miles to finnish the tune. It has a noticable cam lope to it and a guy in a new hemi Charger gave me the thumbs up as we drove passed each other in traffic this morning. I will be getting back to the tuner and a chassis dyno and let everyone know what the rear whell HP is?????
Race Director
Joined: Nov 2005
Posts: 14,553
Likes: 1,549
From: Supporting the Corvette Community at Abel Chevrolet in Rio Vista, CA 707-374-6317 Ext.123
St. Jude Donor '08
Safety Car
Joined: Nov 2007
Posts: 4,537
Likes: 1,404
From: Bethesda MD
The specs I have seen match JoesC5. The cam lobes come in at ~.330. With the 1.8 rockers in the Z06, it works out to ~.590 lift. Install the cam in a regular C6 with the stock 1.7 rockers and the lift drops to the range you stated.
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Team Owner
Joined: Sep 1999
Posts: 41,732
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From: Springfield MO
http://www.gmperformanceparts.com/En...2397&engCat=ls
LS7 Tech Specs Block Part Number:
17802854
Block Type:
Cast aluminum w/6-bolt steel main bearing caps
Bore x Stroke (in):
4.125 x 4.00 (104.8 mm x 101.6 mm)
Camshaft Duration:
211 degree intake / 230 degree exhaust
Camshaft lift (in):
.591" (15 mm) Intake and Exhaust
Camshaft Part Number:
Camshaft type(P/N 12571251
Camshaft type:
Hydraulic roller
Compression ratio:
11.0:1
Connecting Rod Part Number:
12586258):
Connecting rods Type:
Forged titanium
Crankshaft Part Number:
12568819
Crankshaft Type:
Forged steel
Cylinder head Part Number:
12578450
Cylinder head Type:
CNC Ported LS7 specific pattern 70 cc CNC combustion chambers
Displacement (cu in):
427 (7.0L)
Engine Name:
LS7:
Engine type:
Cam-in-block 90-degree V8
Maximum rpm:
7000
Piston Part Number:
89017774
Pistons Type:
Hypereutectic aluminum
Recommended fuel:
91 octane
Reluctor wheel:
58X
Rocker arm ratio:
1.8:1 (offset intake only)
Rocker arms Type:
Investment cast, roller trunnion
Valve size (in):
2.20" titanium intake, 1.61" sodium filled exhaust
