Re: cometic bore size ???? need help
[Re: earthmover]
#1265342
07/10/12 10:08 PM
07/10/12 10:08 PM
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Joined: Mar 2010
Posts: 939
glendora, ca.
Deepockets
super stock
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super stock
Joined: Mar 2010
Posts: 939
glendora, ca.
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i'm not sure on there reasoning. when i ordered my 4.500 bore they said to run the 4.530 gasket. so i did. everything's fine.
Last edited by deepockets; 07/10/12 10:12 PM.
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Re: cometic bore size ???? need help
[Re: Deepockets]
#1265343
07/10/12 10:16 PM
07/10/12 10:16 PM
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Joined: Nov 2004
Posts: 8,094
Sunnyvale, CA
Jeepmon
master
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master
Joined: Nov 2004
Posts: 8,094
Sunnyvale, CA
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Quote:
i'm not sure on there reasoning. when i ordered my 4.500 bore they said to run the 4.530 gasket. so i did. everything's fine.
Thats funny.. Just today I got my Cometics.. 4.500 bore and they sent me 4.540...
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Re: cometic bore size ???? need help
[Re: earthmover]
#1265344
07/10/12 10:18 PM
07/10/12 10:18 PM
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Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
jamesc
master
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master
Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
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Quote:
ok guys i ordered my new cometic head gaskets for my 451 build..the bore size i ordered was 4.380 the block is 4.375...they sent me 4.410 should i send these back or will they be fine???? new to this big block stuff and this type of build....thanks mike 
they probably saved you the hassle of finding out the 4.38 gaskets wouldn't fit because they overhang the bore or combustion chamber. 4.38 only leaves .0025" per side for tolerances and normally chrysler blocks have a pretty heavy chamfer at the top of the bore. even with the 4.41 that's only .018 per side, put them on and go on your way 
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Re: cometic bore size ???? need help
[Re: earthmover]
#1265346
07/10/12 10:28 PM
07/10/12 10:28 PM
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Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
Performance Only
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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run them. that's what i would've sent you also. they did you a favor by giving you a little room. you don't want the gasket the same as the bore size.
machine shop owner and engine builder
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Re: cometic bore size ???? need help
[Re: earthmover]
#1265349
07/10/12 11:04 PM
07/10/12 11:04 PM
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Joined: Jan 2003
Posts: 16,928
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,928
NC
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Quote:
ok guys i ordered my new cometic head gaskets for my 451 build..the bore size i ordered was 4.380 the block is 4.375...they sent me 4.410 should i send these back or will they be fine???? new to this big block stuff and this type of build....thanks mike
For the bore size you ordered, that is a reasonable size gasket. I have a 4.375" bore and I run 4.440" Cometics because the 1978 Chrysler factory put a chamfer on the top of the bore the size of the rings of Saturn...
Don't send them back for smaller gaskets!
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Re: cometic bore size ???? need help
[Re: earthmover]
#1265350
07/11/12 12:08 AM
07/11/12 12:08 AM
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Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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You NEED an extra .030-.060 extra above and beyond the actusl bore size. Run em.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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