Cam bearing recommendation.
Thread Starter
Old School Olds
Joined: Nov 2008
Posts: 9,271
From: Marble Falls TX
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.
Thread Starter
Old School Olds
Joined: Nov 2008
Posts: 9,271
From: Marble Falls TX
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; Aug 10, 2015 at 06:48 PM.
Thread Starter
Old School Olds
Joined: Nov 2008
Posts: 9,271
From: Marble Falls TX
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?
Rodney
Joined: Jun 2011
Posts: 2,589
From: Houston, TX
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.
Registered User
Joined: Jun 2011
Posts: 2,866
From: Carrolllton Texas
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.
Thread Starter
Old School Olds
Joined: Nov 2008
Posts: 9,271
From: Marble Falls TX
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.
Registered User
Joined: Nov 2008
Posts: 8,485
From: Central Fl
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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