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Cam bearing part number difference
https://slantsix.org/forum/viewtopic.php?t=27675		 Page 1 of 1
Author:  mopar_nocar [ Thu Mar 06, 2008 4:43 pm ]
Post subject:  Cam bearing part number difference
Recently pulled a slant from a 75 Dart. Took it down to the machine shop. The old boy bought the #1454M cam bearings which fit 1960-1978 slants. He called me today, and said they would NOT work, that he needed the pn1463 for 1979-87 slants.....

so what is the difference in those part numbers? What changed in the block from 78-79 to make different cam bearings required? If its a 79-87 and not a 75, will my rods and mains work? Using rock auto, I found out the other bearings are different, as well.....ugh.
I did try the search function, and read the articles here, but to no avail. Any ideas?

Thanks,

sb
Author:  slantzilla [ Thu Mar 06, 2008 7:34 pm ]
Post subject: 
I know there are 2 different part numbers for the cam bearings, but never could figure out what the difference is. At one time there was supposedly a grovved rear cam bearing for the hydraulic cams, but this does not seem to be the case anymore.

The rod and main bearings are different on the cast cranks than on the forged cranks. Changeover was sometime in the '76 model year.
Author:  sandy in BC [ Thu Mar 06, 2008 7:47 pm ]
Post subject: 
I notice my front cam bearing is grooved.....is that normal?
Author:  Charrlie_S [ Fri Mar 07, 2008 5:40 am ]
Post subject: 
Quote:
At one time there was supposedly a grovved rear cam bearing for the hydraulic cams, but this does not seem to be the case anymore.
I have never seen a grooved rear cam bearing for the Hydro motors. As far as I can find out, there is no such animal. The groove is on the cam.

Both the solid , and hydro front cam bearing has a groove.
Bearing width is the major difference. These might be a couple of thou off. Done by actual measurement, with a caliper.

#1 Hyd .780, solid .985.
#2 hyd .620, solid .750.
#3 hyd .620, solid .750.
#4 hyd .750. solid .750

OD/ID of the bearings is the same, for hydro, and solid, in the same location.
Author:  mopar_nocar [ Fri Mar 07, 2008 7:12 am ]
Post subject: 
well, I had to call the machine shop and get the later bearings.

sb
Author:  slantzilla [ Fri Mar 07, 2008 10:30 am ]
Post subject: 
The bearings will interchange. I have a late set in my good motor right now.
Author:  Charrlie_S [ Fri Mar 07, 2008 10:38 am ]
Post subject: 
Quote:
The bearings will interchange. I have a late set in my good motor right now.
Might I ask, "for what purpose"?
Author:  slantzilla [ Fri Mar 07, 2008 11:26 am ]
Post subject: 
Because I ordered the late bearings after having been told on this board that the rear bearing had a full groove in it. It doesn't. :? :lol:

Yes, the front one does. :roll:
Author:  Charrlie_S [ Fri Mar 07, 2008 2:40 pm ]
Post subject: 
Quote:
Because I ordered the late bearings after having been told on this board that the rear bearing had a full groove in it. It doesn't. :? :lol:

Yes, the front one does. :roll:
I have seen that false info on the rear cam bearing posted in many places. Actually, as far as I can see the front cam bearing is the same in both applications. I am looking for my "bearing" book, to check the part number of the individual bearing, rather the the complete set.
Author:  Doc [ Fri Mar 07, 2008 4:07 pm ]
Post subject: 
Quote:
Because I ordered the late bearings, after having been told on this board that the rear bearing had a full groove in it. It doesn't...
Zilla does not want to 'give away' one of his speed secrets... he runs those narrow cam bearings to reduce drag on the cam. If he could, he would run grooved bearings in all 4 positions! :wink: :lol:
DD
Author:  sandy in BC [ Fri Mar 07, 2008 4:25 pm ]
Post subject: 
Quote:
If he could, he would run grooved bearings in all 4 positions!
.....sitting , standing, kneeling and.........prone
Author:  slantzilla [ Fri Mar 07, 2008 5:18 pm ]
Post subject: 
Quote:
Quote:
Because I ordered the late bearings, after having been told on this board that the rear bearing had a full groove in it. It doesn't...
Zilla does not want to 'give away' one of his speed secrets... he runs those narrow cam bearings to reduce drag on the cam. If he could, he would run grooved bearings in all 4 positions! :wink: :lol:
DD
Yer killin' me here Doug. :D

Actually, if I did a step by step picture buildup on my motor like you do yours, people would wonder how my junk even starts and runs. :?

Mike himself tore mine down one time and kept muttering "This motor CAN'T be that fast". :lol: :lol: :lol:
Author:  Doctor Dodge [ Sat Mar 08, 2008 8:17 am ]
Post subject: 
Hush, hush.... don't say that to loud.
Slants are so forgiving.... I have seen some pretty messed-up stuff and the motor was still running well. :shock:

The good news it that it does not take 'rocket science' to get a SL6 to run strong and the engine responds well to basic "old school" hot rodding tricks.

This is completly different then today's engines, some of which are hard to get running right if you don't have a degree in computer science. And don't even think about doubling the horse power with a turbo or a big shot of N2O, ... many new tech engines are designed around their HP rating and stuff starts breaking if you add more HP.
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