Good day all and Happy New Year 2007,

A friend just gave me as a XMas gift a brand new camshaft with the following specs:

SBC Hydraulic
270/280 Advertised
206/214 @ .050"
.420" .445" Valve lift
Intake opens 5 atdc closes 31 abdc
112 lobe separation
108 intake centerline

My question to you Pro is : How good this camshaft will be in my new 383 stroker project I am now doing on spare time?

Other parts I presently have now for this 383 are : 350 4 bolts ,Chevy SBC 400 crank, Mahle piston SBC LTWT , Carburetor (650 Edelbrock), Weiand X-Celerator intake, Hooker sidepipe

 

if the 206/214 @ .050 figures are right use a different cam.

 

That cam would get lost in a 383. Does your friend who gave you this cam drive a Rustang, by any chance? The carb. will be too small too, IMO.

 

Just to get a perspective. The very wimpy L-82 cam had 222/222 @ .050 and more lift than your cam.

IMO - It is not a good choice for a bigger CI small block

 

Remember it's the thought that counts.

 

Thx all for the fast reply. What would be a good choice then ?

 

Cam's better fitted for a 283 not a 383. Detonation issues around the corner on that one in anything larger than a 327!

The L-82 cam probably would work decent in a low (8.8/9.2) C.R. 383. Never tested one in that size unit, however, in a 100% original (appearing) 350 with 9.75:1 we can deliver 360 HP/385 Ft.Lbs. with a G.M. factory aluminum (side-by-side) intake, Holley 650, and set of stock cast iron exhaust manifiolds. We've done it with the Q-jet also, but like the Holley better. "Piece of cake" build!

I have to say I personally believe it is one of G.M.'s best ever grinds, fits a bunch of different combos and always delivers!
Thanks, Gary in N.Y.

P.S. Hi George, double check the cam specs on the L-82's, we still sell a high number of these during the year, considering the kit runs about $100.00/$110.00 or so, somewhere in that area, with the Johnson tappets! Excellent "all-around" street cam for mileage, vacuum, and mediocre power!

 

Depends,..do you own a tow truck or a Vette?

Tell us more about your car,..rear gears, tranny, your goals, etc, and I'm sure you can get some good advice on a mo-betta cam.

 

Gary this is what I dug up on the specs:

This is the original part# for the L-46 cam (350/350). Its an excellent street performance cam and its available through GM Performance Parts:

https://www.spoperformanceparts.com/

Under Smallblock Chevy V8 > Camshafts & Camshaft Kits

3896962 - Hydraulic Flat Tappet

This hydraulic flat tappet is used on the 68-81 L-46 and L-82 Corvette. The duration at lash point in degrees (intake/exhaust) is 312/312; duration at .050" tappet lift (intake/exhaust) is 222/222 and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 450/460. Valve lash is zero/zero and lobe centerline is 114 degrees.

As for me I didn't think that the L-82 was real performance and I did the head P&P w/screw in studs and guide plates, headers, Crane power max 272 cam. Excellent cam for 9.5 - 10.0 iron heads. Over 10.0 jump up to the PowerMax 278

 

It is for a plain vanilla out of the box 1980 Vette L-48. I am just looking to improve the street performance by replacing the current 350 2 bolts motor by a 383.

 

Hi George, Happy New Year to all here!
The cam part #3896962 specs are as follows:
320* @ lash, 224* @ .050", .450"/.460", x 114 L/S x 114 ICL. These are excellent selling/stocking cams for us. I don't follow the RPO numbers too closely, but I follow the cam specs. I do know this IS the L-82 however!

That Crane you used with the following specs:
272*/284* @ lash, 216*/228* @ .050", .454"/.480" x 112L/S, on a straight up dyno cam-swap-test would have less available power then the 3896962 (in an apples-to-apples test). The G.M. grind would have a lesser "cam" sound at idle AND higher HP numbers from the dyno. This is why I showed the HP/Torque numbers on the ones we've already tested.

Now, cam part #3863151, the 327/350HP has the 222*/222* @ .050" x .447" x 114L/S x 110* ICL. Much "peakier" cam than the previous one here. Simply put, the torque band will be somewhat "flatter" with the L-82 over the 327/350 piece. (Not sure the engine code with cam, possibly the L-79). And just for argument's sake here, the actual .050" on this is also 221+* degrees not exactly 222*. But for all intents and purposes it's referred to as the 222* @ .050"!

Sell very few of the L-79 (?) pieces however, the 222* @ .050".

If you compare these 2 G.M. cams, you the can "see" the differences. Thanks, Gary in N.Y.

P.S. With more testing using headers and an aftermarket side-by-side intake/Holley carb, still on the 350" platform at 10:1, I believe we could get near the 400 HP number along WITH keeping the L-82 cam in the
program.
ALL this info is directly from G.M., NOT the aftermarket! DO NOT short-change that cam, there's a "ton" of G.M. engineering behind it. We do not consider it a "racer's" cam. It's a "driver"!
George, as we "age" these numbers almost start to "merge"!!!!!