Author Topic: Cam Bearing install on 440  (Read 110 times)

Offline Barracuda73

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Cam Bearing install on 440
« on: January 12, 2018 - 07:01:33 pm »
I'm having trouble lining up the cam bearing that has three oil holes in it. It appears the oil holes that go up to the heads are offset. I have the oil hole for the main bearing lined up and one hole that goes up to the head. The other hole that goes up to the head does not line up. Does this mean my block was drilled crooked from the factory? Do I have to file the oil hole in the cam bearing bigger to fix this? I'm using cam bearings PDP 17.

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Offline jimynick

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Re: Cam Bearing install on 440
« Reply #1 on: January 12, 2018 - 11:06:17 pm »
Is it possible that you have it in backwards? I'd use the old bearing to check and I also don't think driving in and out of the new bearing does it nor you any good. The bearing is a crush fit and having been installed and removed, it may not hold where it's supposed to. We actually had that happen to us one time in a Volvo where we did just what you're doing and it spun, blocked the oil feed hole and starved the top end until we noticed there was no oil coming up. Just my  :2cents:

Offline cudabob496

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« Last Edit: January 14, 2018 - 12:24:54 am by cudabob496 »
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"


Offline Barracuda73

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Re: Cam Bearing install on 440
« Reply #3 on: January 14, 2018 - 09:28:51 pm »
I took the bearing out and actually installed it both ways. The one oil hole will not line up either way. I looked at the old bearing and the new bearing. All of the holes are in the center of the bearing. So 1 hole in the block is off to the side a little. That is why it will not line up. I don't know any history on the Block. I wonder how the old Cam Bearing got oil through it before. It could have probably only had half flow through it. I will have to order a new set of bearings and I will just have to file the hole out to match the block after I install the bearing. Using a cam bearing as a straight edge in the picture you can see  the holes in the block are not lined up.

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Offline 734406pk

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Re: Cam Bearing install on 440
« Reply #4 on: January 15, 2018 - 10:48:44 pm »
 It appears that the drilled oil gallery to the head is off slightly with the block. It's probably in tolerance with the factory spec, but I agree, it looks wrong. So to correct this issue, you would need to pre-file the oil hole in the cam bearing to match the block. Remember to slightly chamfer the modified oil hole (both sides) on the cam bearing prior to install. Also DO NOT reuse cam bearings, once they have been pressed in, they are not re-usable.  Good luck with your build!  :thumbsup:
1973 Challenger 440 6 pack auto 3.91 rear
2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
1970 Challenger TA 340 4bbl auto-Sold and sad
1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
1995 Kawasaki ZX1100E & still alive