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07-25-2013, 08:01 PM | #1 |
Member
Join Date: Nov 2012
Location: St. Davids, Ontario, Canada
Posts: 84
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Valve Clearances
I am doing a complete valve job on my standard 30 Model A engine. The Ford Service bulletins pg. 338 give thew clearances as intake.010 and the exhaust .013 while the Model A Mechanics Handbook Vol. 2 on pg. 2-21 gives intake: .013 and exhaust: .015 What are correct and I would appreciate your wisdom and comments. Thank you. Grant
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07-25-2013, 09:13 PM | #2 |
Senior Member
Join Date: Dec 2011
Location: New hope Minnesota
Posts: 742
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Re: Valve Clearances
For several years I have gone with .013 on intake and exhaust. Others may have different opinion on this. .015 on exhaust would be on the safe side.
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07-25-2013, 09:34 PM | #3 |
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Join Date: May 2010
Location: Alabama
Posts: 8,099
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Re: Valve Clearances
I use mostly original style stainless steel valves from Snyders. I have set both intake and exhaust valves on all of my overhauls at .016 . This has caused no problems for me and Snyders use to recommend this setting. I run my Winfield super street 3/4 race cams with this same setting. original model B cams need more clearance on the exhaust valves. Ford recommended .022 on the model B exhaust valves. I read that he said with a little noise it will keep its poise.
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07-25-2013, 10:58 PM | #4 |
Senior Member
Join Date: May 2010
Posts: 4,179
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Re: Valve Clearances
Humble opinion:
With an original Model A head, original cam, original tappets, & original Ford valves: Clearances set at 0.011" IN & 0.013" EX will be noiseless & successfully function with no problems. |
07-26-2013, 09:43 AM | #5 |
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Join Date: Jun 2010
Location: Temecula, CA
Posts: 4,096
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Re: Valve Clearances
I recommend .012" on intakes and .014" on exhausts. Loser can make noise and lose a minute amount of power. Performance grinds vary a lot, go by the grinder's recommendation. Most Winfield cams were set at .010" straight across, I set them at .010" & .012".
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07-26-2013, 11:45 AM | #6 |
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Join Date: May 2010
Location: Alabama
Posts: 8,099
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Re: Valve Clearances
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07-26-2013, 01:18 PM | #7 |
Senior Member
Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: Valve Clearances
The engine in the little roadster was done in 1961. When I bought it in '76 they were .015-.016" and haven't moved [ original non-adjustable][ just checked them again]. This is about where they start to make a little noise.
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