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#1 |
Senior Member
Join Date: Aug 2012
Location: Texas
Posts: 250
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My extra block that has all machine work done is bored .080 oversize. I bought the copper head gasket and it barely fits over the bore of each cylinder. I mean the openings are almost line to line fit if not an exact size as the bore. I haven't installed the pistons to see if they are down in the bore any at all. Should I try to find a different head gasket that has more bore opening?
Ed |
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#2 |
Senior Member
Join Date: Mar 2012
Location: Ohio
Posts: 2,051
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Isn't 0,080 just barely over 1/16th of an inch? So on each side even half of that???
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#3 |
BANNED
Join Date: May 2010
Location: Wa.
Posts: 5,423
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I forget the part number but the copper gaskets I got (from NAPA) measure 4.125 center to center on the fire ring.
Two of my engines were 4.040 bore. Worked fine with offset bores. |
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#4 |
Senior Member
Join Date: Aug 2012
Location: Texas
Posts: 250
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#5 |
Senior Member
Join Date: May 2010
Location: Long Island, NY
Posts: 3,538
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My understanding is that the copper head gasket available now fits up to an 0.125 oversize cylinder bore. Maybe this is not / no longer the case?
The weakness in a big bore gasket is the minimal material between the cylinders. In my opinion, the big bore gasket contributes to the common burn-through between Cylinders 3 & 4.
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Bob Bidonde |
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#6 | |
Senior Member
Join Date: Aug 2012
Location: Texas
Posts: 250
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Quote:
Ed |
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#7 |
Senior Member
Join Date: Apr 2018
Location: Mebane NC
Posts: 2,411
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Best 509G works just fine on my .100 over, and my pistons go above the deck.
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#8 |
Senior Member
Join Date: May 2010
Location: So Cal
Posts: 8,833
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The link to Vince's site shows the bore size of the different gaskets.
https://www.fordgarage.com/pages/ABc...asketguide.htm |
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#9 |
Member
Join Date: Apr 2014
Location: Worcester, MA
Posts: 50
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Best composite gasket on mine. .125 over
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#10 |
Senior Member
Join Date: Jan 2020
Location: SF Bay Area
Posts: 1,185
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My engine is 0.080” over, I use the Best 509G and am very happy with it.
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JayJay San Francisco Bay Area ------------------------ 1930 Murray Town Sedan 1931 Briggs S/W Town Sedan |
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