The Ford Barn

Max41 · 03-31-2013, 04:24 PM

A question asked 1000 times. What is the minimum valve and piston clearance for a bone stock 41 flatheadf V8. The only "upgrade" are .100 over Egge pistons. Interesting also, all parts are marked 81A vs 11A throughout the engine.

Mike in AZ · 03-31-2013, 05:42 PM

welcome to the 'Barn....someone will answer....maybe lots of someones....lol.....so whatcha working on??...got pics??...lol.....Mike

Binx · 03-31-2013, 09:42 PM

Quote:

Originally Posted by Max41

A question asked 1000 times. What is the minimum valve and piston clearance for a bone stock 41 flatheadf V8. The only "upgrade" are .100 over Egge pistons. Interesting also, all parts are marked 81A vs 11A throughout the engine.

81A sounds like correct numbers for '41. General rule is no less than .040" clearance for piston and valve.

Here's a good site to review:

http://www.vanpeltsales.com/FH_web/f...85to100mid.htm

Lonnie

Ol' Ron · 03-31-2013, 09:47 PM

I'm running 81A heads on the 8bA test engine and had to mill them 040" to get my .050.

Brian · 03-31-2013, 10:37 PM

In my opinion; .040" clearance over pistons and as much as possible over the valves as an aid in breathing, but without compromising compression!??

Max41 · 04-01-2013, 09:07 AM

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Brian
Thank you for the welcome. I am working on a 1941 Ford Fordor Super Deluxe. The car has had one owner (family wise) in that my Greatgrand Father bought it new in Nov 40, have the sales receipt. A Great Aunt drove it, then my Dad, a daily driver until 71. I got it about 10 years ago, but have only been working on it for about the past 2years. Making some headway. I will post pictures soon. Again thanks for the welcome.

Max41 · 04-01-2013, 09:09 AM

Binx,
Thanks for the info.

Max41 · 04-01-2013, 09:11 AM

Mike in AZ,
Thank you for the welcome. I am working on a 1941 Ford Fordor Super Deluxe. The car has had one owner (family wise) in that my Greatgrand Father bought it new in Nov 40, have the sales receipt. A Great Aunt drove it, then my Dad, a daily driver until 71. I got it about 10 years ago, but have only been working on it for about the past 2years. Making some headway. I will post pictures soon. Again thanks for the welcome.

03-31-2013, 04:24 PM	#1
Max41 Member Join Date: Mar 2013 Location: Chesapeake, VA Posts: 36	Valve and pistion clearance A question asked 1000 times. What is the minimum valve and piston clearance for a bone stock 41 flatheadf V8. The only "upgrade" are .100 over Egge pistons. Interesting also, all parts are marked 81A vs 11A throughout the engine.

03-31-2013, 05:42 PM	#2
Mike in AZ Senior Member Join Date: May 2010 Location: Waddell, AZ Posts: 2,540	Re: Valve and pistion clearance welcome to the 'Barn....someone will answer....maybe lots of someones....lol.....so whatcha working on??...got pics??...lol.....Mike

03-31-2013, 09:47 PM	#4
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Valve and pistion clearance I'm running 81A heads on the 8bA test engine and had to mill them 040" to get my .050.

03-31-2013, 10:37 PM	#5
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 3,832	Re: Valve and pistion clearance In my opinion; .040" clearance over pistons and as much as possible over the valves as an aid in breathing, but without compromising compression!??

04-01-2013, 09:07 AM	#6
Max41 Member Join Date: Mar 2013 Location: Chesapeake, VA Posts: 36	Re: Valve and pistion clearance Sponsored Links (Register now to hide all advertisements) Brian Thank you for the welcome. I am working on a 1941 Ford Fordor Super Deluxe. The car has had one owner (family wise) in that my Greatgrand Father bought it new in Nov 40, have the sales receipt. A Great Aunt drove it, then my Dad, a daily driver until 71. I got it about 10 years ago, but have only been working on it for about the past 2years. Making some headway. I will post pictures soon. Again thanks for the welcome.

04-01-2013, 09:09 AM	#7
Max41 Member Join Date: Mar 2013 Location: Chesapeake, VA Posts: 36	Re: Valve and pistion clearance Binx, Thanks for the info.

04-01-2013, 09:11 AM	#8
Max41 Member Join Date: Mar 2013 Location: Chesapeake, VA Posts: 36	Re: Valve and pistion clearance Mike in AZ, Thank you for the welcome. I am working on a 1941 Ford Fordor Super Deluxe. The car has had one owner (family wise) in that my Greatgrand Father bought it new in Nov 40, have the sales receipt. A Great Aunt drove it, then my Dad, a daily driver until 71. I got it about 10 years ago, but have only been working on it for about the past 2years. Making some headway. I will post pictures soon. Again thanks for the welcome.