Cam bearing recommendation.
August 10th, 2015, 05:53 PM
#1
Old School Olds
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Location: Marble Falls TX
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Cam bearing recommendation.
Pulled the cam from my 70 455 and didn't like the look of the bearings.
Wondering what you guys would recommend. Also looking for a quality tool for the R&R of them.
Wondering what you guys would recommend. Also looking for a quality tool for the R&R of them.
August 10th, 2015, 06:25 PM
#3
Old School Olds
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Location: Marble Falls TX
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Well, the cam came out clean, as were the bearings, but had some like pitting on top
of them. I haven't pulled them yet, but wanted new ones for the new cam and lifters. The last pic is of the engine upside down, if you look close you can see how nasty they look.
of them. I haven't pulled them yet, but wanted new ones for the new cam and lifters. The last pic is of the engine upside down, if you look close you can see how nasty they look.
Last edited by tru-blue 442; August 10th, 2015 at 06:48 PM.
August 12th, 2015, 04:12 AM
#6
Old School Olds
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Thanks for the response Greg, I had seen different manufacturers using multiple oiling holes for some reason. The stock units only have the one. Any reason for the multiples that you know of? And are the Dura Bonds configured this way or are they the single holes?
August 12th, 2015, 06:01 AM
#7
Rodney
Join Date: Jun 2011
Location: Houston, TX
Posts: 2,365
DuraBond Cam Bearings
HeyAdam:
I'm currently researching this subject too. What I've learned is the back grooved DuraBond O-6B bearings should be installed with the oil hole in the 3 o'clock position as viewed from the front of the motor and with the block right-side up. The O-6B bearings have a single oil hole, if you install the oiling hole at 6 o'clock there is a chance oil supply can be restricted by excessive cam loading (high valve spring pressures, timing chain load, etc.). Rotating the oil hole to 3 o'clock allows for a stronger oil wedge between the cam journal and the bearing. You cannot do this with a standard bearing, there must be an annular groove in the back of the bearing to allow the oil to flow behind the bearing up to the 3 o'clock hole. Here's a helpful diagram.
I'm currently researching this subject too. What I've learned is the back grooved DuraBond O-6B bearings should be installed with the oil hole in the 3 o'clock position as viewed from the front of the motor and with the block right-side up. The O-6B bearings have a single oil hole, if you install the oiling hole at 6 o'clock there is a chance oil supply can be restricted by excessive cam loading (high valve spring pressures, timing chain load, etc.). Rotating the oil hole to 3 o'clock allows for a stronger oil wedge between the cam journal and the bearing. You cannot do this with a standard bearing, there must be an annular groove in the back of the bearing to allow the oil to flow behind the bearing up to the 3 o'clock hole. Here's a helpful diagram.
August 12th, 2015, 06:08 AM
#8
My company has the only full circle cam bearing set other than Durabond on the market. We use a premium Babbitt alloy on our stock replacement sets, keep consistant, run out free leading edge chamfers for ease of installation and clean all excess Babbitt tailings out of the oil holes. PM me if you want a set.
August 12th, 2015, 10:49 AM
#9
Old School Olds
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Thanks boys, you don't know how much. Much needed to know info. 
All the engines I ever built, came back from the machine shop as short blocks, I then took it from there. Thank you. Joe, pm sent. As far as the tool goes for R&R, sumbich, I think I need to rent one. 
All the engines I ever built, came back from the machine shop as short blocks, I then took it from there. Thank you. Joe, pm sent. As far as the tool goes for R&R, sumbich, I think I need to rent one.
August 12th, 2015, 11:30 AM
#10
Registered User
Join Date: Nov 2008
Location: Central Fl
Posts: 7,892
heyadam:
I'm currently researching this subject too. What i've learned is the back grooved durabond o-6b bearings should be installed with the oil hole in the 3 o'clock position as viewed from the front of the motor and with the block right-side up. The o-6b bearings have a single oil hole, if you install the oiling hole at 6 o'clock there is a chance oil supply can be restricted by excessive cam loading (high valve spring pressures, timing chain load, etc.). Rotating the oil hole to 3 o'clock allows for a stronger oil wedge between the cam journal and the bearing. You cannot do this with a standard bearing, there must be an annular groove in the back of the bearing to allow the oil to flow behind the bearing up to the 3 o'clock hole. Here's a helpful diagram.
I'm currently researching this subject too. What i've learned is the back grooved durabond o-6b bearings should be installed with the oil hole in the 3 o'clock position as viewed from the front of the motor and with the block right-side up. The o-6b bearings have a single oil hole, if you install the oiling hole at 6 o'clock there is a chance oil supply can be restricted by excessive cam loading (high valve spring pressures, timing chain load, etc.). Rotating the oil hole to 3 o'clock allows for a stronger oil wedge between the cam journal and the bearing. You cannot do this with a standard bearing, there must be an annular groove in the back of the bearing to allow the oil to flow behind the bearing up to the 3 o'clock hole. Here's a helpful diagram.
x2.
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