The Ford Barn

Fourdy · 03-09-2014, 08:02 PM

I searched but could not find this info. After grinding the valves, what is the min. dimension that should be left on the side of the valve"

Hope that is clear.

Thanks,

Fourdy

paleot · 03-09-2014, 08:07 PM

If it is sharp don't use it!

Fourdy · 03-09-2014, 08:25 PM

paleot,

I had heard that but thought you needed a minimum for proper cooling.

Thnx

Fourdy

Fordestes · 03-09-2014, 08:41 PM

1/32nd inch margin is what I always go by ,except in a high performace app .especially on the ehaust valve of which I like to have about 3/32.

john mullen · 03-09-2014, 08:49 PM

^^^^^^ Exhaust are critical -Intakes not as much but no sharp edges on ither

Ross F-1 · 03-09-2014, 08:57 PM

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That is called the valve margin, the specs are in the righthand column, called "min. head thickness."

john mullen · 03-09-2014, 09:48 PM

Just wondering who's data that is???

Ross F-1 · 03-09-2014, 09:51 PM

It's from the '49 - '51 Ford Truck workshop manual

Fourdy · 03-09-2014, 10:10 PM

Thanks so much guys. I have a lot of valves to go through.
Fourdy

john mullen · 03-09-2014, 11:45 PM

Thanks ross f-1. I didn't see anything on the attachment showing where the tech info came from. I was wondering about the valve adjustment recommendations for lash. I never set mine that loose on my 8rt. that chart shows .017 and .019>>> man that's loose I have always set them at .010 and .012 cold .. very smooth and no noise.. I was given those settings by an old ford flathead man who worked on them all his life.????? Anyway thanks for the info...

hardtimes · 03-10-2014, 12:07 PM

Hey Ross,
Thanks, visuals/stats work for me ! I've used .013 for both valves with success.
I/32 in intake , but seems too 'slim' for exhaust heat/burn factor ?

Ross F-1 · 03-10-2014, 12:15 PM

The .017/.019 lash spec is ONLY for rotator type valve systems. I believe the rotators need the extra clearance to function. Surprisingly little difference in noise in my experience.

john mullen · 03-10-2014, 04:42 PM

Thanks Ross F-1... great info to ponder over ......

03-09-2014, 08:02 PM	#1
Fourdy Senior Member Join Date: May 2010 Location: Port Townsend, WA Posts: 601	Flathead valves I searched but could not find this info. After grinding the valves, what is the min. dimension that should be left on the side of the valve" Hope that is clear. Thanks, Fourdy __________________ My 24 T http://fordbarn.com/forum/showthread...ghlight=fourdy

03-09-2014, 08:07 PM	#2
paleot Senior Member Join Date: Jan 2012 Location: s/w Louisiana Posts: 119	Re: Flathead valves If it is sharp don't use it!

03-09-2014, 08:25 PM	#3
Fourdy Senior Member Join Date: May 2010 Location: Port Townsend, WA Posts: 601	Re: Flathead valves paleot, I had heard that but thought you needed a minimum for proper cooling. Thnx Fourdy __________________ My 24 T http://fordbarn.com/forum/showthread...ghlight=fourdy

03-09-2014, 08:41 PM	#4
Fordestes Senior Member Join Date: May 2010 Posts: 931	Re: Flathead valves 1/32nd inch margin is what I always go by ,except in a high performace app .especially on the ehaust valve of which I like to have about 3/32.

03-09-2014, 08:49 PM	#5
john mullen Senior Member Join Date: Jan 2012 Location: Lanexa Va Posts: 254	Re: Flathead valves ^^^^^^ Exhaust are critical -Intakes not as much but no sharp edges on ither

03-09-2014, 09:48 PM	#7
john mullen Senior Member Join Date: Jan 2012 Location: Lanexa Va Posts: 254	Re: Flathead valves Just wondering who's data that is???

03-09-2014, 09:51 PM	#8
Ross F-1 Senior Member Join Date: Nov 2010 Location: NM Posts: 2,443	Re: Flathead valves It's from the '49 - '51 Ford Truck workshop manual __________________ '52 F-1, EAB flathead

03-09-2014, 10:10 PM	#9
Fourdy Senior Member Join Date: May 2010 Location: Port Townsend, WA Posts: 601	Re: Flathead valves Thanks so much guys. I have a lot of valves to go through. Fourdy __________________ My 24 T http://fordbarn.com/forum/showthread...ghlight=fourdy

03-09-2014, 11:45 PM	#10
john mullen Senior Member Join Date: Jan 2012 Location: Lanexa Va Posts: 254	Re: Flathead valves Thanks ross f-1. I didn't see anything on the attachment showing where the tech info came from. I was wondering about the valve adjustment recommendations for lash. I never set mine that loose on my 8rt. that chart shows .017 and .019>>> man that's loose I have always set them at .010 and .012 cold .. very smooth and no noise.. I was given those settings by an old ford flathead man who worked on them all his life.????? Anyway thanks for the info...

03-10-2014, 12:07 PM	#11
hardtimes Senior Member Join Date: May 2010 Location: South California Posts: 6,190	Re: Flathead valves Hey Ross, Thanks, visuals/stats work for me ! I've used .013 for both valves with success. I/32 in intake , but seems too 'slim' for exhaust heat/burn factor ?

03-10-2014, 12:15 PM	#12
Ross F-1 Senior Member Join Date: Nov 2010 Location: NM Posts: 2,443	Re: Flathead valves The .017/.019 lash spec is ONLY for rotator type valve systems. I believe the rotators need the extra clearance to function. Surprisingly little difference in noise in my experience. __________________ '52 F-1, EAB flathead

03-10-2014, 04:42 PM	#13
john mullen Senior Member Join Date: Jan 2012 Location: Lanexa Va Posts: 254	Re: Flathead valves Thanks Ross F-1... great info to ponder over ......