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 Post Posted: Tue Sep 06, 2011 11:52 am 
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Joined: Sun Sep 02, 2007 9:07 pm
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Location: kewanee,il
any opinions on a sbc standard journal diameter of 1.868, and how much lobe should be the limit for longevity of the setup ?

also, any opinions on running a .470-.475 lobe on a .910 base circle and the same 1.868 journal, as far as longevity is concerned.
probably with 280 lbs on the seat and approx. rate of 600 lbs

1.70-1.75 rocker



thanks jerome

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 Post Posted: Tue Sep 06, 2011 8:24 pm 
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Joined: Tue Apr 18, 2006 3:20 pm
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Location: Missouri
jbaker wrote:
any opinions on a sbc standard journal diameter of 1.868, and how much lobe should be the limit for longevity of the setup ?

also, any opinions on running a .470-.475 lobe on a .910 base circle and the same 1.868 journal, as far as longevity is concerned.
probably with 280 lbs on the seat and approx. rate of 600 lbs

1.70-1.75 rocker

thanks jerome


Thats a lot of lobe for such a small base circle and that much rocker and spring pressure. I'd be looking for ways to fix the clearance issue before resorting to a cam like that. Small Journal rods and 3.875" stroke will clear with standard base circle and no grinding on the rods (Compstar). Honda journals and 4" stroke should work also. I know some do some minor grinding/milling to the rods for clearance.

It'll probably work like that but I'd keep a close eye on things.

Rick


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 Post Posted: Thu Sep 08, 2011 3:18 am 
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I agree with fixing the clearance issues.
If I had to run a small base circle cam I would cut back on the rate of the lobe just a little and use a larger diameter and larger roller diameter lifter. Get with a good cam grinder and discuss doing that.

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