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#1 |
Member
Join Date: Jun 2018
Posts: 49
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I am building a B motor with modern valves, stock B cam, high compression head , down draft carb 81. What should the valves be set to ?
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#2 |
Senior Member
Join Date: May 2010
Location: Oregon
Posts: 1,379
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Have you measured the lift on all of the lobes on the B-cam?
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#3 |
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Join Date: Jun 2018
Posts: 49
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brand new cam never been used
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#4 |
Senior Member
Join Date: Dec 2013
Location: Waxahachie, Texas
Posts: 992
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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.
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#5 |
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Join Date: Jun 2014
Location: Land of Lincoln
Posts: 3,169
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I think on the ford garage site there’s a chart for valve clearances with different cams
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#6 | |
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Join Date: May 2010
Location: Oregon
Posts: 1,379
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What does the maker of the cam recommend? |
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#7 |
Senior Member
Join Date: May 2010
Posts: 2,620
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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.
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#8 | |
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Join Date: Jun 2010
Location: Temecula, CA
Posts: 4,114
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#9 |
Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 4,102
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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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