Original cam

[Morris R.]

What would be a stock cam for a 66 corvette l79?

[John H.]

Re: Original cam

What would be a stock cam for a 66 corvette l79?

Morris -

The "151" hydraulic cam - part number 3863151, casting number 3863152; used from 1965-1968.

[Joe L.]

Re: Original cam

Morris -

The "151" hydraulic cam - part number 3863151, casting number 3863152; used from 1965-1968.

John and Morris------


...and long-since GM-discontinued but available in reproduction.

[Duke W.]

Re: Original cam

Are you trying to ID the installed cam, or are you looking for an exact replacement?

Duke

[Joe R.]

Re: Original cam

Joe,

Correct me if I'm wrong, but I think the Sealed Power CS274 is the best reproduction. It's available at NAPA. They might also have a cam and lifter kit available, but I don't know the part number for that.

Joe

[Jim T.]

Re: Original cam

John was the "151" hydraulic cam used by GM in 1964? Reason for asking, I saw a 1964 Chevelle SS convertible in the local Antique and Classic Car Show locally SAT and the owner said it had a rare engine option, the 327/350 HP.

[Duke W.]

Re: Original cam

CS274 is the base engine cam. The L79 engine option was not available for the 1964 model year. It was a new Corvette engine option for '65 and was also available in the Chevelle with just over 6000 built, which was nearly 1500 more than installed in Corvettes that year.

The L79 became available in the Chevy II in '66 with close to 5500 built.

http://macswebs.com/l79registry/

Duke

[Tom D.]

Re: Original cam

370 HP L79 in a Chevelle didn't happen until after the first part of the 1965 model year, so I don't see how one could have been sold (by GM) in a 1964 Chevelle. There might have been a test car with 350 HP in 1964, but I don't think GM would sell it that way, even if sold after testing.

[Joe L.]

Re: Original cam

John was the "151" hydraulic cam used by GM in 1964? Reason for asking, I saw a 1964 Chevelle SS convertible in the local Antique and Classic Car Show locally SAT and the owner said it had a rare engine option, the 327/350 HP.

Jim------


No factory installed L-79's for 1964 Chevelles. A 250 HP 327 (L-30) was the top engine.

[Morris R.]

Re: Original cam

Would you happen to know the company? Thank you maury

[Joe R.]

Re: Original cam

Would you happen to know the company? Thank you maury

Maury,

Are you referring to my post? You might try the "Reply With Quote" next time. The cam I mentioned is made by Sealed Power (Federal-Mogul). It is supposed to be an exact replacement for the GM cam.

Joe

[Joe C.]

Re: Original cam

Would you happen to know the company? Thank you maury

This is a reproduction of the original "151" cam. It is actually a hybrid of the "151" and the "962" which replaced it:

http://www.northernautoparts.com/ProductModelDetail.cfm?ProductModelId=4240

[Duke W.]

Re: Original cam

Would you happen to know the company? Thank you maury

Federal Mogul offers the L-79 cam, built to the GM print, part number CS179R, however, I recommend the L-46/82 cam, CS1095R in place of it installed 4 degrees advanced from the OE indexing. This advance will yield the same inlet POML at the L-79 cam. It will require an adjustable timing set, which is also readily available. This cam has the same LSA with two degrees more duration, which is not significant, and it has better dynamics. The high level specs of both cams on on the NAPA web site.

In either case use the VS677 valve springs, which are OE equivalents to the springs used in all SBs from '67 to about 1980.

You can buy everything you need for a rebuild at NAPA, and they have a good online parts catalog including cross references from OE part numbers.

Duke

[Domenic T.]

Re: Original cam

Federal Mogul offers the L-79 cam, built to the GM print, part number CS179R, however, I recommend the L-46/82 cam, CS1095R in place of it installed 4 degrees advanced from the OE indexing. This advance will yield the same inlet POML at the L-79 cam. It will require an adjustable timing set, which is also readily available. This cam has the same LSA with two degrees more duration, which is not significant, and it has better dynamics. The high level specs of both cams on on the NAPA web site.

In either case use the VS677 valve springs, which are OE equivalents to the springs used in all SBs from '67 to about 1980.

You can buy everything you need for a rebuild at NAPA, and they have a good online parts catalog including cross references from OE part numbers.

Duke

Duke,

POML & LSA, could you put words to them as many acronyms and letters have different meanings.

DOM

[Duke W.]

Re: Original cam

POML = point of maximum lift. This is often referred to as "centerline", but since most OE cams have asymmetrical lobes the actual "centerline" and POML are not the same.

LSA = lobe separation angle, which is a qualitative measure of overlap. Both of these cams have the same LSA, which is 114 degrees, and since they have nearly the same durations, the effective overlap in sq-in-deg is nearly the same, so they will both have the same idle behavior.

The CS1095R inlet POML is 114 degrees ATDC, which is okay on the longer stroke 350, but on a 327 it's best to install this cam at 110 ATDC, which is the same as the OE indexing of the CS-179R.

Duke