The Ford Barn

49r · 04-21-2012, 02:16 AM

My 8BA is bored +60 and I had issues with an unknown make of gasket compressing over the bore and the piston audibly hitting it. A standard bore Felpro replacement has fixed this but it still looked close when fitting. I'd heard that a standard head gasket should do up to +80 before a 'big bore' gasket is needed?

Walt Dupont--Me. · 04-21-2012, 08:30 AM

A std. gasket will work on .060 bore no problem. I have used them on .080 but it's but it's a torse up. Walt

Randy · 04-21-2012, 08:34 AM

I talked to Fel Pro and they told me 0.060" was max for a 7283B gasket, but alot depended on the chamfer that the machine shop put on the top edge of the bore after boring.

GOSFAST · 04-21-2012, 09:17 AM

Most gaskets for the later ('49/'53) builds will not make the +080" oversize, they should make a +.060" however.

I have here Fel-Pro's and some early McCords, the fire-ring on the McCord's #6244R/L's ('49/'53) measures 3.265", and the fire-ring on the Fel-Pro's #7525B/7526B ('49/'53) is 3.255".

Fel-Pro has the bore size listed (on the above part numbers) on their "print" as 3.270", but in reality they actually do measure the 3.255".

The earlier Fel-Pro gasket's #7283B (24 stud '46/'48) does measure 3.270", so I'm assuming they simply carried the dimension "across the board" to the later pieces??

Thanks, Gary in N.Y.

P.S. Any gasket that measures 3.270" will make the +.080", the others are questionable at best! You don't want any of that fire-ring "hanging" in the bores if possible!

49r · 04-22-2012, 04:03 AM

Thanks everyone for your helpful comments.

jdl · 04-24-2012, 11:15 AM

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Quote:

Originally Posted by 49r

My 8BA is bored +60 and I had issues with an unknown make of gasket compressing over the bore and the piston audibly hitting it. A standard bore Felpro replacement has fixed this but it still looked close when fitting. I'd heard that a standard head gasket should do up to +80 before a 'big bore' gasket is needed?

I e-mailed Best Gasket co. about the std gasket size...this is the std 49-53 gasket set.

Hello , you should be fine with the std RS521G. Our gasket bore actual measurement is 3.295

Roy Lucero

www.bestgasket.com
Ph (888)333-2378 Ph (562)699-6631 Fax (562)699-5034

flatjack9 · 04-24-2012, 12:14 PM

I wonder what the diameter is when torqued in place?

04-21-2012, 02:16 AM	#1
49r Senior Member Join Date: Jul 2011 Location: Wellington New Zealand Posts: 308	Max bore on a standard head gasket? My 8BA is bored +60 and I had issues with an unknown make of gasket compressing over the bore and the piston audibly hitting it. A standard bore Felpro replacement has fixed this but it still looked close when fitting. I'd heard that a standard head gasket should do up to +80 before a 'big bore' gasket is needed?

04-21-2012, 08:30 AM	#2
Walt Dupont--Me. Senior Member Join Date: May 2010 Location: Gardiner Me. Posts: 4,200	Re: Max bore on a standard head gasket? A std. gasket will work on .060 bore no problem. I have used them on .080 but it's but it's a torse up. Walt

04-21-2012, 08:34 AM	#3
Randy Senior Member Join Date: May 2010 Location: Austin Posts: 696	Re: Max bore on a standard head gasket? I talked to Fel Pro and they told me 0.060" was max for a 7283B gasket, but alot depended on the chamfer that the machine shop put on the top edge of the bore after boring.

04-21-2012, 09:17 AM	#4
GOSFAST Senior Member Join Date: May 2010 Location: Long Island, NY Posts: 1,052	Re: Max bore on a standard head gasket? Most gaskets for the later ('49/'53) builds will not make the +080" oversize, they should make a +.060" however. I have here Fel-Pro's and some early McCords, the fire-ring on the McCord's #6244R/L's ('49/'53) measures 3.265", and the fire-ring on the Fel-Pro's #7525B/7526B ('49/'53) is 3.255". Fel-Pro has the bore size listed (on the above part numbers) on their "print" as 3.270", but in reality they actually do measure the 3.255". The earlier Fel-Pro gasket's #7283B (24 stud '46/'48) does measure 3.270", so I'm assuming they simply carried the dimension "across the board" to the later pieces?? Thanks, Gary in N.Y. P.S. Any gasket that measures 3.270" will make the +.080", the others are questionable at best! You don't want any of that fire-ring "hanging" in the bores if possible!

04-22-2012, 04:03 AM	#5
49r Senior Member Join Date: Jul 2011 Location: Wellington New Zealand Posts: 308	Re: Max bore on a standard head gasket? Thanks everyone for your helpful comments.

04-24-2012, 12:14 PM	#7
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,527	Re: Max bore on a standard head gasket? I wonder what the diameter is when torqued in place?