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01-30-2020, 09:04 AM | #1 |
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Join Date: Feb 2011
Posts: 2,113
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Stock Valve Seat Pressure
Found a lot of dialog on seat (spring) pressure for performance cams but nothing on this value for a stock 221 cu in engine.
Anyone out there have this info for our flatheads? I would also be interested to know how this value is determined? Thank you!
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Tim Downtown, Ca |
01-30-2020, 09:20 AM | #2 |
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Join Date: May 2010
Location: Solihull, England.
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Re: Stock Valve Seat Pressure
30 - 40 lbs at 2-1/8" test length.
From the repair manual. Official ford publication. |
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01-30-2020, 09:40 AM | #3 |
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Join Date: Feb 2011
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Re: Stock Valve Seat Pressure
Thank you, mine tested at 20# seemed pretty light........need to locate a ford shop manual for my 35’
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Tim Downtown, Ca |
01-30-2020, 12:31 PM | #4 |
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Join Date: May 2010
Location: so cal, placerville, vegas
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Re: Stock Valve Seat Pressure
According to the data published in the Motor Manual, c.1943, for 1935-42 vehicles...
Here are the specs.... 1935 through 1942, for all 'regular' V8's. (V860 is different) Valve closed, 37-40 Lb at 2.13 in. Valve open, 76-80 at 1.83 Pretty much the same info as posted by Mart, above. |
01-31-2020, 12:15 PM | #5 |
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Join Date: May 2010
Location: Chester Vt
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Re: Stock Valve Seat Pressure
When actually measuring spring pressure, you have to do it at installed height. Which is determinded by the valve keeper lock. On my street engines I use 50/55 lbs on all cams, except the 400jr at 65. Unless you are actually racing, this is more than enough. amd keeps everybody happy under 5K
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01-31-2020, 01:41 PM | #6 |
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Location: so cal, placerville, vegas
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Re: Stock Valve Seat Pressure
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