L82 cam
Drifting
Joined: Mar 2006
Posts: 1,263
Likes: 188
From: Wabasha Mn
Agree that comp 268 is a good cam for your use. I had a mild 76 L82 with AT and went with an Isky 264 mega cam with 214-214 dur @ 050 .450 .450 lift on a 108 lsa . Had lots of low and mid range power, better than the l82 cam. Similar to the comp 268, but I prefer Isky over Comp.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
I could definitely be wrong, I have read conflicting info. Here is where I got that. https://itstillruns.com/difference-b...-12185069.html
Probably most accurate source of published OE data for 1980 (and other years) is straight from the horses mouth ... GM ... and it ain't perfect either
https://www.gmheritagecenter.com/doc...t-Corvette.pdf
Racer
Joined: Jul 2005
Posts: 433
Likes: 14
From: GA
A cam in the 280 (advertised) range is a really bad idea with stock heads, low compression, and what is likely a 3.08 rear end.... The stock 1980 heads run out of flow below 5,500 rpm, and no big cam will ever fix that.
A nice running cam setup is one based on the L79 350-horse 327. This is one of the best-running Chevy hydraulic-cammed engines ever produced when running the stock heads. When the 350 replaced the 327, GM designated the new hi perf 350 the "L46," which also put out 350 hp. This L46 cam is the same as the L82, and is almost identical to the L79. However, the L46 cam was revised with much better cam lobe dynamics, making it potentially a better cam than the L79. Unfortunately, they ground the cam lobes on a 114-degree intake centerline instead of the L79 110-degree spec. If you use an adjustable timing gear set, such as the Cloyes C3023X (or similar), you can use the L46 cam and simply advance it 4 degrees to achieve the L79 110-degree centerline. This is a great setup for a mild street engine, offering outstanding bottom-end torque and power through the usable rpm range of the heads. The L46 cam is available from Federal-Mogul under part number CS1095R, available through any NAPA store or Summit Racing (with lifters HT817). This cam will produce a "performance" exhaust note and idle while still producing enough vacuum to operate the power brakes and headlights.
Lars
L79 versus L46/L82 cam specs (duration @ .050"):
L79 Hydr. Lifter (327/350 hp) 222/222° .447”/.447” 110° Centerline
L46 Hydr. Lifter (350/350 hp) & L82 222/222° .450”/.460” 114° Centerline
A nice running cam setup is one based on the L79 350-horse 327. This is one of the best-running Chevy hydraulic-cammed engines ever produced when running the stock heads. When the 350 replaced the 327, GM designated the new hi perf 350 the "L46," which also put out 350 hp. This L46 cam is the same as the L82, and is almost identical to the L79. However, the L46 cam was revised with much better cam lobe dynamics, making it potentially a better cam than the L79. Unfortunately, they ground the cam lobes on a 114-degree intake centerline instead of the L79 110-degree spec. If you use an adjustable timing gear set, such as the Cloyes C3023X (or similar), you can use the L46 cam and simply advance it 4 degrees to achieve the L79 110-degree centerline. This is a great setup for a mild street engine, offering outstanding bottom-end torque and power through the usable rpm range of the heads. The L46 cam is available from Federal-Mogul under part number CS1095R, available through any NAPA store or Summit Racing (with lifters HT817). This cam will produce a "performance" exhaust note and idle while still producing enough vacuum to operate the power brakes and headlights.
Lars
L79 versus L46/L82 cam specs (duration @ .050"):
L79 Hydr. Lifter (327/350 hp) 222/222° .447”/.447” 110° Centerline
L46 Hydr. Lifter (350/350 hp) & L82 222/222° .450”/.460” 114° Centerline
I wish I hadn't read this.... I'm tempted to redo my cam.
The engine is still on the test stand with approx 40 min run time to break in the cam. Wouldn't be much $$$ or effort to swap to L46/L79/L82 if worth while performance gain.
Pretty much a stock rebuild:
71 L48, .030 over, flat tops, 461 heads with 2.02/1.60, ram horns with 2.5 conversion, stock intake, Q-jet and dizzy rebuilt by you, TH400 with stock converter and 3.08,
Current cam is CS274.
Is there much to gain by changing just the cam or better to leave it alone?
Thanks,
Jim
Last edited by Jim71Vette; Sep 10, 2019 at 03:46 PM.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Lars,
I wish I hadn't read this.... I'm tempted to redo my cam.
The engine is still on the test stand with approx 40 min run time to break in the cam. Wouldn't be much $$$ or effort to swap to L46/L79/L82 if worth while performance gain.
Pretty much a stock rebuild:
71 L48, .030 over, flat tops, 461 heads with 2.02/1.60, ram horns with 2.5 conversion, stock intake, Q-jet and dizzy rebuilt by you, TH400 with stock converter and 3.08,
Current cam is CS274.
Is there much to gain by changing just the cam or better to leave it alone?
Thanks,
Jim
I wish I hadn't read this.... I'm tempted to redo my cam.
The engine is still on the test stand with approx 40 min run time to break in the cam. Wouldn't be much $$$ or effort to swap to L46/L79/L82 if worth while performance gain.
Pretty much a stock rebuild:
71 L48, .030 over, flat tops, 461 heads with 2.02/1.60, ram horns with 2.5 conversion, stock intake, Q-jet and dizzy rebuilt by you, TH400 with stock converter and 3.08,
Current cam is CS274.
Is there much to gain by changing just the cam or better to leave it alone?
Thanks,
Jim
