The Ford Barn

4tford · 04-20-2011, 11:08 AM

Trying to lap in the valves on a 255. All the seats have a rather narrow pattern on the valves and seats. Other than minor pitting all the seats are this way and do not look as if there was a previous problem. Is this pattern sufficient. Thanks Bill

Russ/40 · 04-20-2011, 12:14 PM

The contact area you have is ideal. It would be better if the contact area was centered on the valve face, but I would not hesitate to run them that way.

Kahuna · 04-20-2011, 12:18 PM

Absolutely right. Run that puppy

4tford · 04-20-2011, 12:41 PM

Best news I have had all week. Thanks Guys.

Ronnie · 04-20-2011, 10:00 PM

Run it seats on valve are a little high up but so are nuts on a giraffe run that bad boy.

Ronnie

Frank Miller · 04-21-2011, 08:53 AM

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My understanding is that the seats should be towards the edge of the valve with just a bit of shiny steel showing. The bigger diameter gives you the most contact area for valve cooling but you do not want the heat transfer at the very edge of the valve. I am no expert but this seems to make sense.

saints · 04-21-2011, 09:26 AM

Quote:

Originally Posted by Ronnie

Run it seats on valve are a little high up but so are nuts on a giraffe run that bad boy.

Ronnie

^^^^ ha ha ha ha thats funny I about spit coffee all over my key board

Ol' Ron · 04-21-2011, 01:00 PM

I like a 3 angle valve job 20/45/060" intake and 15/45/60 .075" exhaust with the seat right up near the edge on the exhaust, this keeps the exhaust valve cooler. Now after you have the valves lapped in, under cut the intake valve with a 20 deg angle up to the lapped area. The exhaust you can leave stock. Use a piece of 400 paper to break the edges of the valve face angles and the seat angles. This may sound like allot of work, but will pay off in longevity of the valve job, plus a little better breathing.

Ronnie · 04-21-2011, 07:29 PM

Quote:

Originally Posted by saints

^^^^ ha ha ha ha thats funny I about spit coffee all over my key board

Humor is good medicine.Some every day is good for all.
Wish I could have seen you read it "LOL"

Ronnie

KiWinUS · 04-22-2011, 08:06 AM

Quote:

Originally Posted by Ol' Ron

I like a 3 angle valve job 20/45/060" intake and 15/45/60 .075" exhaust with the seat right up near the edge on the exhaust, this keeps the exhaust valve cooler. Now after you have the valves lapped in, under cut the intake valve with a 20 deg angle up to the lapped area. The exhaust you can leave stock. Use a piece of 400 paper to break the edges of the valve face angles and the seat angles. This may sound like allot of work, but will pay off in longevity of the valve job, plus a little better breathing.

Im with Ron !!! very well & correctly described . You could run it as is , as almost anything that half ass seals will run , but if you want it correct !!! "Listen " to Ron !!!
Any kind of pitting & the seats should be resurfaced with stone or cutter !& valves refaced.
Cheers
Tony

04-20-2011, 11:08 AM	#1
4tford Senior Member Join Date: May 2010 Location: Regina Canada Posts: 1,335	valve and seat lapping Trying to lap in the valves on a 255. All the seats have a rather narrow pattern on the valves and seats. Other than minor pitting all the seats are this way and do not look as if there was a previous problem. Is this pattern sufficient. Thanks Bill Last edited by 4tford; 08-05-2020 at 08:03 AM.

04-20-2011, 12:14 PM	#2
Russ/40 Senior Member Join Date: May 2010 Location: Santee, California Posts: 3,505	Re: valve and seat lapping The contact area you have is ideal. It would be better if the contact area was centered on the valve face, but I would not hesitate to run them that way.

04-20-2011, 12:18 PM	#3
Kahuna Senior Member Join Date: May 2010 Location: NorCal Posts: 2,617	Re: valve and seat lapping Absolutely right. Run that puppy

04-20-2011, 12:41 PM	#4
4tford Senior Member Join Date: May 2010 Location: Regina Canada Posts: 1,335	Re: valve and seat lapping Best news I have had all week. Thanks Guys.

04-20-2011, 10:00 PM	#5
Ronnie Senior Member Join Date: May 2010 Location: Canada Where it snows Posts: 2,058	Re: valve and seat lapping Run it seats on valve are a little high up but so are nuts on a giraffe run that bad boy. Ronnie

04-21-2011, 08:53 AM	#6
Frank Miller Senior Member Join Date: May 2010 Location: Auburn, MA Posts: 2,106	Re: valve and seat lapping Sponsored Links (Register now to hide all advertisements) My understanding is that the seats should be towards the edge of the valve with just a bit of shiny steel showing. The bigger diameter gives you the most contact area for valve cooling but you do not want the heat transfer at the very edge of the valve. I am no expert but this seems to make sense. __________________ “The technique of infamy is to start two lies at once and get people arguing heatedly over which is true.” ~ Ezra Pound

04-21-2011, 01:00 PM	#8
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: valve and seat lapping I like a 3 angle valve job 20/45/060" intake and 15/45/60 .075" exhaust with the seat right up near the edge on the exhaust, this keeps the exhaust valve cooler. Now after you have the valves lapped in, under cut the intake valve with a 20 deg angle up to the lapped area. The exhaust you can leave stock. Use a piece of 400 paper to break the edges of the valve face angles and the seat angles. This may sound like allot of work, but will pay off in longevity of the valve job, plus a little better breathing.