valve clearence , B motor

I don't know if it applies to "B" cams, but Les Andrews' book calls for .013" for intake valves and .015" for exhaust ford Model A cams. Maybe others here on the Barn will chime in.
 
steveankc@gmail.com said:
brand new cam never been used
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A new NOS Ford Model B cam or some other interpretation thereof? The stock Model B cam had an intake lobe lift of 0.334 inches (0.015 inch valve clearance) and an exhaust lobe lift of 0.341 inches (0.022 inch valve clearance. Reground B cams can come in a variety of specs.

What does the maker of the cam recommend?
 
Also the stock NOS Model B camshaft (un-reground cam) used a unique lifter (lifter is longer and heel is larger in diameter) which if used with the smaller diameter model A lifter will result in damage to both the camshaft and the lifter.
 
ursus said:
A new NOS Ford Model B cam or some other interpretation thereof? The stock Model B cam had an intake lobe lift of 0.334 inches (0.015 inch valve clearance) and an exhaust lobe lift of 0.341 inches (0.022 inch valve clearance. Reground B cams can come in a variety of specs.

What does the maker of the cam recommend?
Click to expand...

There were 3 different B grinds, the most common one had .302" lift, the next one had .315" and the latest one had .339" an slightly more duration than the others.
 
Valve clearance has to do with how things change with temperature and how the cam was ground. Some have a ramp that closes up the gap so that the tappet noise is reduced, and some don't. I would start with the Model A clearances and then measure the gap as the cam comes up on the lift part. If the gap gets smaller as the cam approaches the lifting part, then there is a ramp and you may want to increase the gap. If the tappets are really noisy than you may want to reduce the gap.
 
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