C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Head gasket bore size

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Old May 4, 2003 | 03:10 PM
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Default Head gasket bore size

What bore size head gasket shold I get ?

1. FPP 1010 - 4.166"(bore) 0.039 compressed thickness 8.9cc comp. volume
or
2. FPP 1043 - 4.080"(bore) 0.039 comp. thickness 8.2 comp. volume

It's for 1990. L-98



[Modified by Sliding, 9:10 PM 5/4/2003]
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Old May 4, 2003 | 03:12 PM
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Default Re: Head gasket bore size (Sliding)

I don't think its going to make much difference unless you are shooting for a certain CR. I'm running the 1010s.
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Old May 4, 2003 | 03:17 PM
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Default Re: Head gasket bore size (scorp508)

Thanks!
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Old May 4, 2003 | 04:33 PM
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Default Re: Head gasket bore size (Sliding)

I would go for the smallest diameter that doesn't over hang the edge of the bore. .7 cc will have little effect on the CR. I would be more concerned with keeping the crevice volume to a minimum.

RACE ON!!!
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Old May 5, 2003 | 12:39 PM
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Default Re: Head gasket bore size (Sliding)

1044 is stock with a .051 compression thickness; or use the GM ZZ4 gaskets #12557236.
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Old May 5, 2003 | 12:49 PM
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Default Re: Head gasket bore size (SunCr)

I found a set of .029 composite heads gaskets here
http://www.flatoutgaskets.com/gaskets/techtips.asp

if you want a little more compression without buying copper gaskets.
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Old May 5, 2003 | 02:27 PM
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Default Re: Head gasket bore size (CFI-EFI)

Thanks!
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Old May 5, 2003 | 02:28 PM
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Default Re: Head gasket bore size (ld85)

:eek: I just put a set of Felpro 1010s on my car. I didn't realize that the bore size was 4.166". If I had known about the 1043 with a 4.080" bore size, I would have used them!

I haven't fired the car up yet, but I hope that the 4.166" bore won't be a problem on my car.
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Old May 5, 2003 | 02:39 PM
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Default Re: Head gasket bore size (TheCorvetteKid)

Well if what SunCr said about 1044 being stock then You don't have to
worry because 1044 is 4.200" bore size.

But I'll go with 1043.
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Old May 5, 2003 | 03:19 PM
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Default Re: Head gasket bore size (Sliding)

Here's another Try COMETIC
http://www.cometic.com/home/home.htm

I called them for my 406, they have a 4.160 bore .025 gasket, composite, that does not need re-tightening. Problem, is they want $72 per gasket
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Old May 5, 2003 | 04:05 PM
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Default Re: Head gasket bore size (ld85)

Where are you pulling them from? :D :D :D
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