The Ford Barn

1930.68B · 01-03-2020, 11:22 AM

I've read several post on the pros and cons of using oversize valves but haven't seen any mention of the oversize valves causing problems with the head gasket. Has anyone with the oversize valves had any issues with blown head gaskets?
Thanks

Jim Brierley · 01-03-2020, 12:15 PM

I use 1.700" intakes, with no problems. Bigger than stock exhausts are not needed.

BillCNC · 01-03-2020, 12:17 PM

Nope, how could valves effect a head gasket? If it was a thing, then over-sized pistons would also be a thing.

Regards
Bill

PC/SR · 01-03-2020, 05:55 PM

Check to be sure the oversize valve clears the side of the combustion chamber.

kenparker · 01-03-2020, 06:04 PM

ditto what Jim B says. I have used 1.700 intake valves in several engines.

PC/SR · 01-04-2020, 12:35 AM

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Check the clearance of oversized valves anyway. 1.7" did not clear my Weiand head combustion chamber edges. Do not know what head Jim B and Ken Parker used with no problems. Let us know. I have never heard of anything failing for measuring too much.

kenparker · 01-04-2020, 07:58 AM

PC/SR for the record I have used Stock Model A, Snyders 5.5 and 6.1, and Brumfeld 5.9

Jim Brierley · 01-04-2020, 12:00 PM

I have used a Cyclone head, presently a BRIERLEY head, no problems with either.

Benson · 01-04-2020, 12:11 PM

I had one of the first Lion Head III 6.5 to 1 (4 spark plugs)(first version of III) 1.7 intakes rubbed on head had to relieve area.

The later ones were changed to clear 1.7s.

No problem with original Thomas 8.25 to 1 head

PC/SR · 01-04-2020, 12:36 PM

Thanks for the info on the heads and fitting the valves. Good to know.

01-03-2020, 11:22 AM	#1
1930.68B Senior Member Join Date: Mar 2014 Location: Canton, IL Posts: 186	Oversize Valves I've read several post on the pros and cons of using oversize valves but haven't seen any mention of the oversize valves causing problems with the head gasket. Has anyone with the oversize valves had any issues with blown head gaskets? Thanks

01-03-2020, 12:15 PM	#2
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,085	Re: Oversize Valves I use 1.700" intakes, with no problems. Bigger than stock exhausts are not needed.

01-03-2020, 12:17 PM	#3
BillCNC Senior Member Join Date: Aug 2017 Location: SoCal Desert Posts: 826	Re: Oversize Valves Nope, how could valves effect a head gasket? If it was a thing, then over-sized pistons would also be a thing. Regards Bill

01-03-2020, 05:55 PM	#4
PC/SR Senior Member Join Date: May 2010 Location: Santa Rosa, CA Posts: 1,278	Re: Oversize Valves Check to be sure the oversize valve clears the side of the combustion chamber.

01-03-2020, 06:04 PM	#5
kenparker Senior Member Join Date: May 2010 Location: Van, Texas Posts: 1,122	Re: Oversize Valves ditto what Jim B says. I have used 1.700 intake valves in several engines.

01-04-2020, 12:35 AM	#6
PC/SR Senior Member Join Date: May 2010 Location: Santa Rosa, CA Posts: 1,278	Re: Oversize Valves Sponsored Links (Register now to hide all advertisements) Check the clearance of oversized valves anyway. 1.7" did not clear my Weiand head combustion chamber edges. Do not know what head Jim B and Ken Parker used with no problems. Let us know. I have never heard of anything failing for measuring too much.

01-04-2020, 07:58 AM	#7
kenparker Senior Member Join Date: May 2010 Location: Van, Texas Posts: 1,122	Re: Oversize Valves PC/SR for the record I have used Stock Model A, Snyders 5.5 and 6.1, and Brumfeld 5.9

01-04-2020, 12:00 PM	#8
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,085	Re: Oversize Valves I have used a Cyclone head, presently a BRIERLEY head, no problems with either.

01-04-2020, 12:11 PM	#9
Benson Senior Member Join Date: May 2010 Posts: 2,594	Re: Oversize Valves I had one of the first Lion Head III 6.5 to 1 (4 spark plugs)(first version of III) 1.7 intakes rubbed on head had to relieve area. The later ones were changed to clear 1.7s. No problem with original Thomas 8.25 to 1 head Last edited by Benson; 01-04-2020 at 12:19 PM.

01-04-2020, 12:36 PM	#10
PC/SR Senior Member Join Date: May 2010 Location: Santa Rosa, CA Posts: 1,278	Re: Oversize Valves Thanks for the info on the heads and fitting the valves. Good to know.