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Cam bearings

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My Haynes manual shows the following:
1147: 1.8402 to 1.8407
clearance .0026 to .0046

1296: 1.9649 to 19654
clearance .0026 to .0046

1500: 1.9659 to 1.9664 front and rear journals
1.9649 to 1.9654 center journal
bore in the block: 1.9680 to 1.9695
clearance front and rear .0016 to .0036
center .0026 to .0046

hope this helps
 
I seem to recall reading somewhere that you could run the "hotter" 1300 cam in the 1500 without bearings but you could also bore out the journal bores and run the 1300 bearing in them.

Let us know what you find out so we can clear this up. I admit, I'm confused. But then that doesn't take much.
 
I was pretty surprised with the differences between the inner and outer journals too. I decided that the tighter tolerances were in the two outer journals and there was slop in the inner journals. Couldn't quite figure out why but I brought my old mic set to work today to check them against the NIST standards we have in our calibration shop.
JC
 
Okay, I went and checked an untouched 1500 block. These are only caliper dimensions, but the block bore on the front journal is about 1.969". The one I checked with a bearing installed was the same on the block bore, and the ID of the bearing runs about 1.840"+. So, the bearing inserts work in a 1500 block, if you run the smaller journal cam. I thought I had checked a large journal cam yesterday, but I goofed. The numbers I gave were correct for the bearing fitment, not the bore in the block.
Mea Culpa.
Jeff
 
Ooh...Ooh...So if I get my cam turned a bit, I can have bearings pressed into the block without having to hog out the bores...interesting. I just might have to look into that. I'm very nervous about a cam with no bearings. It does make an interesting conversation piece when I tell people though...lol
JC
 
Re-read the comment Jeff made earlier with regards to the scroll cut and oiling, too! Wouldn't do to fuse it together on the first run /ubbthreads/images/graemlins/wink.gif
 
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