[mmiros]

I have a 1958 Chieften 370c.i. Would like to find a replacement for cam #524886.
This was their high performance cam back in the day.

Mike

[mmiros]

need a good source for a cam to match the high per. back in the day. Part #524886 was the one for the 1958 370 CI

Mike

[hurryinhoosier62]

Have you contacted Lunati or Comp Cams?

[400 Lemans]

https://www.jalopyjournal.com/forum/...-build.972505/

[Stan Weiss]

Originally Posted by 400 Lemans

https://www.jalopyjournal.com/forum/...-build.972505/

That list this for that cam
524886 cam (283/293, 207/218 @ .050, .406"/.406"

The specs that I have for the 524886 (Also call Number 6 Hydro) cam are

From Rotella
283/293 207/219 .410/.410 114 LSA

From H-O
283/293 214/220 .400/.400

Stan

[MarkS57]

If I recall correctly, the cam in my 1962 Bonneville 303hp 389 had a connecting oil passage in cam journals 2 & 4 that allowed oil to make its way to the stud oiled rockers; do these newer cams still have that? I bought an 068 Melling awhile back but didn't notice if it had those passages.

[KEN CROCIE]

The 068 will a close match to the 886 and is available through Crane and others.
Stan: what H-O publication did you find the .050 #s. Not doubting , just curious. The TD-01 doesn't show .050.

[Stan Weiss]

Originally Posted by KEN CROCIE

The 068 will a close match to the 886 and is available through Crane and others.
Stan: what H-O publication did you find the .050 #s. Not doubting , just curious. The TD-01 doesn't show .050.

Ken,
I would have to look to see if I could find the publication. I do have a scan of that page on my computer which I have attached to this post.

Stan

[PontiacJim1959]

Specs for the "886" cam:

Int. Dur. - 283
Int Open - 29
Int. Close - 74
Lift - .406"
Exh. Dur. - 293
Ex. Open - 82
Ex. Close - 31
Lift . 406"
Overlap - 60 degrees.

The "886" was the street version of the 1956 285HP "869" cam.

Int. Dur. - 289 (110.5 Lobe Center)
Int. Open - 34
Int. Close - 75
Lift - .406"
Exh. Dur. - 298 (112 Lobe Center)
Exh. Open - 81
Exh. Close - 37
Lift - .406"
Overlap -71 degrees.

[Formulas]

That Stan scan looks to be from How to build a high performance Pontiac V8 HO. publication going from memory dont have it in front of me but I do have it
Good Book

[steve25]

The early motors that brought oil up to the heads did so thru a addition passage cast along and running up each side of the lifter valley and then thru the head gasket.

It's feed passage came off of the lifter galley which inturn was fed from the junction of the oil feed holes in the main web under Number 3 main Bearing if a recall right, so the Cam Bearing journal was never grooved.

[MarkS57]

Originally Posted by steve25

The early motors that brought oil up to the heads did so thru a addition passage cast along and running up each side of the lifter valley and then thru the head gasket.

It's feed passage came off of the lifter galley which inturn was fed from the junction of the oil feed holes in the main web under Number 3 main Bearing if a recall right, so the Cam Bearing journal was never grooved.

True, the cam bearings were not grooved but at least for the early 389's, the rockers were fed off #2 and #4 cam journals, see attached. May not be the case for a 370 but I would check to make sure.
This is tattooed on my brain because of a mistake I made on my first rebuild- a 62 389. Some might remember the 3 holes the earlier cam bearings had. They weren't equally spaced (120 deg) oh no, 'course not. If you didn't pay attention to the spacing and only made sure the bottom feed hole was lined up one of the 3 holes, then chances are the other 2 wouldn't line up with the rocker feed galleries. When I started my 389 the first time, it was "why is there a racket coming from my valve covers?" Well, no oil to the rockers. So tear down to the point where I could remove and re-align the #'s 2 & 4 cam bearings. PIA..oh well, lesson learned. This design was kind of an oil re-stricter because the oil would only flow through to the rocker arm feed gallery when the cam journal passage ways were lined up with the main feed and the rocker arm feed during rotation. That's why- for an early 389 anyway, the cam needs to have those passage ways in the 2 & 4 journals. Of course, going to a set of later rocker arms with the oil spit holes so you get pushrod rocker oiling would make it all a moot point.

[Jack Gifford]

Since 1959 I've paid a lot of attention to Mickey Thompson's ideas, especially regarding Pontiacs (it's worked out well for me). For the '55-'66 heads Mickey always milled enough of the chambers away to eliminate the "bathtub". In addition to the improved chamber shape, it allows smaller piston dishes to achieve 9:1 c.r. The milling leaves enough squish area that D-shaped dishes maintain good squish. Slightly opening the chamber walls around the intake valve also helps.
P.S.- Also visible in the photo are the slots cut into the center exhaust ports to unsiamese them, with steel plates that fit into the slots (so that headers can be more effective).