cam for 63 300hp

[Sander B.]

i ordered a complete engine rebuild kit for my 63 300hp
and got a camshaft with part number E-274-S can someone tell if this is a correct cam
for the 300hp aplication ?

thank you,
Sander

[Duke W.]

Re: cam for 63 300hp

No, it's some aftermarket cam. The OE '63 cam was replaced by 3896929 in 1967 and this carried through to 1979. The service part number is 14088839, but I'm not sure if it's still available.

You can also buy a Clevite exact replacement from NAPA for less than $60. Just use their online cross reference.

Duke

[Joe L.]

Re: cam for 63 300hp

Sander and Duke-----

It's possible that the "E-274-S" is the manufacturer's coding for a reproduction of the 300 hp cam. There are several manufacturer's that make this cam and I have no idea what the coding that each of them uses is. In fact, the coding found on the cam end is often not even the same as the various part numbers that the manufacturers use. So, I think it's hard to say what this means.

The GM #14088839 remains available from GM. However, I believe it GM lists for about $275.

[Sander B.]

[Duke W.]

Re: cam for 63 300hp

What Joe and I are saying is that we cannot ID the part number you listed. It's aftermarket, but we don't know the mfg. or specs or whether it is an exact clone of the ...929 or not.

Ask the vendor who provided the kit, and google the part number to see if the Web has any info on it.

You now have the GM replacement numbers as a reference.

Duke

[Sander B.]

Re: cam for 63 300hp

i did a google search on E274S and found at a supplier (Not the one i bought it from)
this info on the cam: Lift: .390/.410 Dur. @ .050": 194/203 LC: 112

Sander,

[Duke W.]

Re: cam for 63 300hp

Wow, GM vintage OE replacement stuff is getting EXPENSIVE! That's more than a custom cam from Crane using existing lobe masters.

The Clevite clone from NAPA for less than 60 bucks sounds like a great deal.

Duke

[Sander B.]

Re: cam for 63 300hp

yes i send the vendor an email for the specs

thanks Sander,

[Duke W.]

Re: cam for 63 300hp

That sounds like a ...929 replacement. I measured the exhaust .050" duration at 204 degrees off the drawing, but I've seen is speced elsewhere at 203.

Duke

[Sander B.]

Re: cam for 63 300hp

so it could be right for the 300hp
when i ordered the parts i provided all info for the 300hp

when i got the parts i checked the valves and they where the wrong size
(too small) and wondering now if i have the right Cam

Sander,

[Duke W.]

Correction...

I measured 202, not 204 degrees off the drawing.

The high level specs match the ...929.

The OE valve sizes are 1.94/1.50".

Duke

[Jeff S.]

Re: cam for 63 300hp

Gilbert Chevrolet (fka Sallee Chevrolet) sells brand new 14088839 cams for $10. They are "take offs" from their crate engines sales where the customer has ordered higher performance equipment.

[Duke W.]

Re: cam for 63 300hp

I thought they were gone, but if they still have any left, it's a steal!

The 839, which is for all practical purposes identical to the 929 was used for the 350/300 HP crate engine, but for some odd reason that is beyond me they use the L-46/82 cam in the current 350/290 HP crate engine.

The 929 and 839 drawing lobe data are essentially within production tolerance of each other.

Duke

[Sander B.]

[Duke W.]

Re: cam for 63 300hp

All the specs jibe with the 929 except the exhaust duration, which I measured off the drawing data as 202, but I have no doubt that this cam is a replica of the 929.

Duke