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Old 09-02-2007, 05:03 PM
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383 chevy cam clearance

this is a question about terms used to discribe a cam. I'm building a stroked small block chevy 350 (383) I'm using eagle 6 inch rods I've clearanced the block. and was in the process of determining if there was going to be any potential interferance with the cam. I truned town a piece of tubing the same diam. to slide through the cam bearing. I rotated through a complete cycle and there was just a few thousands clearange between the rod and the tube.
The question is how to determine how much clearance will each cam provide given the specifications that show in the cam manufactures spec sheets. If any given cam was placed on a surface plate and rolled across it. could I ask how much clearance would be between the nose of the exhaust and intake lobes and the surface plate. If you could get the heel diam. and the grosse lift of the cam could you determin the clearance?

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Old 09-02-2007, 05:09 PM
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Base circle will vary from cam to cam. This changes the actual lobe lift height from the cam center..

I have done 383's where no interference was found and others where every rod hit. Each block/combo is different. Ya gotta check it out..
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Old 09-02-2007, 07:12 PM
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its not the actual ^ tip of the lobe that comes into contact with the rods its the base. you should have .060-.100 clearance between the rods and the base of the cam. i used H beam rods with a 1.100 inch base cam and it cleared the rods in my 383 chevy.

some people use a small base circle cams to clear the rods. but will need longer pushrods.

Last edited by 383silverado; 09-02-2007 at 07:18 PM.
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