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Old 06-11-2008, 01:22 PM
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396 Cam Bearing

I just picked up my short block from the engine shop. Its a 396 BB casting #3955272. When I took it over the engine builder said the block was an early 65-66 block and would need a grooved cam and bearings. I have the cam and went ahead and had him install the bearings. After checking the casting myself I found the block was a 69 and did not require the grooved cam. I checked the last bearing and it has a groove in it. I have not grooved the cam yet.

Can I run the ungrooved cam with the grooved rear cam bearing since the engine does not require it? Or do I either need to groove the cam or install the correct bearing?

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Old 06-11-2008, 01:46 PM
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the #5 cam bearing housing bore is aprox. .010 larger on 65 and 66 396 engines. you need to get the correct bearings and cam for the 69. the clevite # you need is SH-616S for the cam bearings.

sam-missle
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Old 06-11-2008, 02:05 PM
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You definately don't want the grooved bearings. Chevy changed this for a good reason.
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Old 06-11-2008, 02:37 PM
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OK....well he made them fit I guess.....like I said the block is 3955272, so I don't know how he got it confused. But, I can see the rear journal has a groove in it. I'm frustrated to say the least....this is going to be a blown engine with a 8-71 blower. How could the mismatch even be installed?
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Old 06-11-2008, 02:42 PM
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Apparently your machinist was not concerned with a .012 press fit!!!
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Old 06-11-2008, 02:44 PM
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I sense some future trouble if its not corrected too I guess
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Old 06-11-2008, 03:09 PM
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Quote:
Originally Posted by sam-missle
the #5 cam bearing housing bore is aprox. .010 larger on 65 and 66 396 engines. you need to get the correct bearings and cam for the 69. the clevite # you need is SH-616S for the cam bearings.

sam-missle
This is incorrect. The #5 camshaft bores on all 396 engines are sized at 2.1295"-2.1305". The only difference is that the '65 and '66 engines have no groove behind the cam bearing, necessitating a grooved rear cam journal and /or beariing to provide proper oiling. The '67 and later blocks had a groove machined in the rear cam bearing bore to provide for proper oiling. Using a grooved cam and/or bearing with the later engine can cause a reduction of oil pressure.

tom
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Old 06-11-2008, 03:34 PM
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[QUOTE=machine shop tom]This is incorrect. The #5 camshaft bores on all 396 engines are sized at 2.1295"-2.1305". The only difference is that the '65 and '66 engines have no groove behind the cam bearing, necessitating a grooved rear cam journal and /or beariing to provide proper oiling. The '67 and later blocks had a groove machined in the rear cam bearing bore to provide for proper oiling. Using a grooved cam and/or bearing with the later engine can cause a reduction of oil pressure.

tom[/QUOTE

sorry you are right, i guess i need to learn to read the bearing catalog a little better.

sam-missle

Last edited by sam-missle; 06-11-2008 at 03:48 PM.
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Old 06-11-2008, 03:59 PM
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Quote:
Originally Posted by machine shop tom
This is incorrect. The #5 camshaft bores on all 396 engines are sized at 2.1295"-2.1305". The only difference is that the '65 and '66 engines have no groove behind the cam bearing, necessitating a grooved rear cam journal and /or beariing to provide proper oiling. The '67 and later blocks had a groove machined in the rear cam bearing bore to provide for proper oiling. Using a grooved cam and/or bearing with the later engine can cause a reduction of oil pressure.

tom
Thanks Tom, the groove in the bearing is very small....with my "ungrooved cam" do you think I'll have problems with a high volume pump???
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Old 06-11-2008, 05:27 PM
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Originally Posted by Rick0300
Thanks Tom, the groove in the bearing is very small....with my "ungrooved cam" do you think I'll have problems with a high volume pump???
Do yourself and your engine a favor by using the correct rear cam bearing and selling the HV pump.

tom
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Old 06-11-2008, 09:16 PM
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Originally Posted by machine shop tom
Do yourself and your engine a favor by using the correct rear cam bearing and selling the HV pump.

tom
Ok, thanks Tom and also everyone else....the HV not a good idea??
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Old 07-01-2008, 02:10 PM
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Well I'm going to change the bearing to an ungrooved as suggested....I'm using the coated dura-bond bearings which were in the neighborhood of $50. I probably cannot replace only the rear bearing....do I have to remove the crank to change it? Or do I have to remove the other bearings to get to it?
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Old 07-02-2008, 12:57 PM
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Yeah you have to remove the crank to change it.
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