Re: New block, tight cam, fix?
[Re: 440Jim]
#3072108
08/28/22 04:16 PM
08/28/22 04:16 PM
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Joined: Mar 2011
Posts: 3,178 Michigan
A727Tflite
master
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master
Joined: Mar 2011
Posts: 3,178
Michigan
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The BMP aluminum block does not come with cam bearings. The shop that machined my bores, etc installed new Clevite cam bearings for $75. The cam fit perfect. He told me the factory Mopar blocks had cam alignment minor issues, but most of the new aftermarket blocks don't have any issues with the cam bearings. All the issues start after the factory cam bearings get replaced. That’s because all the production engines had their cam bearings machined on the ID AFTER installation. Same thing for automatic transmission bushings. They could hold tighter concentricity with this method. This process is still in place to my knowledge.
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Re: New block, tight cam, fix?
[Re: A727Tflite]
#3072116
08/28/22 04:35 PM
08/28/22 04:35 PM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,539
So. Burlington, Vt.
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The BMP aluminum block does not come with cam bearings. The shop that machined my bores, etc installed new Clevite cam bearings for $75. The cam fit perfect. He told me the factory Mopar blocks had cam alignment minor issues, but most of the new aftermarket blocks don't have any issues with the cam bearings. All the issues start after the factory cam bearings get replaced. That’s because all the production engines had their cam bearings machined on the ID AFTER installation. Same thing for automatic transmission bushings. They could hold tighter concentricity with this method. This process is still in place to my knowledge. I can understand how there can be a sizing/alignment issue in an OE block after the bearings get replaced........ because of the procedure being used by the factory for the finish sizing. But there’s really no excuse for a $5000+ aftermarket block having the issue. The cam bores should be in alignment and to size........ and so long as the cam is straight and sized within spec....... the cam “should” slip right in. I’ve used 3 of the previous generation BM/Mopar aluminum blocks and those had no problems with the cam fit.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: New block, tight cam, fix?
[Re: fast68plymouth]
#3072396
08/29/22 02:30 PM
08/29/22 02:30 PM
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Joined: Jan 2003
Posts: 10,088 Frostbitefalls MN (Rocky&Bullw...
gregsdart
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 10,088
Frostbitefalls MN (Rocky&Bullw...
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I pulled the cam, put in another cam, and it glides freely. So i checked the diameters of the new cam. They were all spot on with the other cam. So i tried reinstalling the cam that was tight. I cleaned the journals, put 20w50 oil on it, and it turns freely! I am scratching my head, and have to figure it was the type of assembly lube I used when I originally put the cam in? I used Lucas assembly lube, and it was tight on install, but after sitting for months, it got thicker? I couldn't turn cam with my bare hand, but after going to 20w50 it is snug, but I can turn it with fingertips.
Last edited by gregsdart; 08/29/22 02:32 PM.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: New block, tight cam, fix?
[Re: gregsdart]
#3072482
08/29/22 08:59 PM
08/29/22 08:59 PM
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Joined: Aug 2003
Posts: 43,744 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,744
Bend,OR USA
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I gave up using the old Torco brand red assembly lube after they got bought out back a long time ago. The motor runs on oil, correct? So why not use that to assembled them on all the bearings, pistons and piston wall surfaces I do I prime all my motors and spin them over by hand or on the starter with all the spark plugs out before starting them to make sure they are well lube with the engine oil they will live on: up:
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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