head gasket differance 98-01/ 02-04

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Sep 7, 2005 | 08:27 PM

phils C5 vette

Thread Starter

Le Mans Master

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From: Tampa Fl

St. Jude Donor '12-'13-'14

head gasket differance 98-01/ 02-04

whats the differance between the years? does it matter
12498543 1997-2001 LS1 / LS6 Head Gasket Kit
12498544 2002 and Newer LS1 / LS6 Head Gasket Kit

I got a set of AFR 205s for my 2000, but they sent the 12498544 part number and I was wondering if it will work on my Y2K?

thanks

Sep 7, 2005 | 08:44 PM

Fastguy

Team Owner

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From: This vette goes to 11 Milford MA

St. Jude Donor '03-'05

I just used chevy truck 6.0L gaskets on my 98 w/late model heads.

Sep 7, 2005 | 09:00 PM

SteveDoten

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From: Farmington CT

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the 02+ use metal gaskets

Sep 7, 2005 | 09:43 PM

Bink

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St. Jude Donor '09

'98 -'01 graphite gasket is .052", compressed.

'02 -'04 Metal ( MLS) gasket thickness is .060", compressed.

Sep 7, 2005 | 11:20 PM

FixedRoof

Melting Slicks

Joined: Mar 2003

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From: FL

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Quote:

Originally Posted by Bink

'98 -'01 graphite gasket is .052", compressed.
'02 -'04 Metal ( MLS) gasket thickness is .060", compressed.

Yup

You really can use either one, unless your heads are 97-99 that have the notch in the deck. This requires the graphite gasket to seal right. I would use the earlier ones due to them being thinner if you are after every bit of compression. Thats what I'm using with my later model LS1 head castings.

steve

Sep 8, 2005 | 05:45 AM

DangerousMind

Instructor

Joined: Aug 2005

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The Multi-layer steel gaskets are stronger and would be better for forced induction right?

Sep 8, 2005 | 09:00 AM

phils C5 vette

Thread Starter

Le Mans Master

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From: Tampa Fl

St. Jude Donor '12-'13-'14

OK great. 5 differant answers

will the two differant gaskets set up differant on the block or heads.
I guess im looking for if al the holes line up the same.

I thought they are .51 thick ?

Sep 9, 2005 | 08:02 AM

phils C5 vette

Thread Starter

Le Mans Master

Joined: Nov 2003

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From: Tampa Fl

St. Jude Donor '12-'13-'14

I wanted to see what my compression was going to be dependant on which thickness I have

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Sep 9, 2005 | 05:36 PM

schpodie

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What is difference between '02 and '03-04 MLS gasket thickness? I understood '02 is thinner than '03-04?

Sep 11, 2005 | 09:08 AM

#10

SteveDoten

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From: Farmington CT

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Head CC volume vs Compression Ratio:
________________________________________ ______

The below CR numbers are with the stock GM 5.7L displacement LS1 graphite head gaskets installed.

Installing the thicker 2003 GM MLS head gaskets will decrease your compression ratio by approx 0.1 - 0.2

72.27cc = 9.1 CR
71.71cc = 9.2 CR
71.05cc = 9.3 CR
70.59cc = 9.4 CR
70.03cc = 9.5 CR
69.74cc = 9.6 CR
68.91cc = 9.7 CR
68.35cc = 9.8 CR
67.79cc = 9.9 CR
67.23cc = 10.0 CR
66.67cc = 10.1 CR (stock LS1 head spec)
66.11cc = 10.2 CR
65.55cc = 10.3 CR
64.99cc = 10.4 CR
64.43cc = 10.5 CR (stock LS6 head spec)
63.87cc = 10.6 CR
63.31cc = 10.7 CR
62.75cc = 10.8 CR
62.19cc = 10.9 CR
61.63cc = 11.0 CR
61.07cc = 11.1 CR
60.51cc = 11.2 CR
59.95cc = 11.3 CR
59.39cc = 11.4 CR
58.83cc = 11.5 CR
58.27cc = 11.6 CR
the above was borrowed from a common ls1 site

Sep 11, 2005 | 11:31 AM

#11

SpeedyZ

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From: Southwest Virginia

Either gasket will work. All the holes will line up the same. The later MLS gaskets will be stronger. What was said above was older (pre 2002) GM heads have a notch in the deck of the heads and have to use the older gaskets to seal around this notch, newer gaskets won't seal around this notch, AFR heads do not have this notch so either gasket will work and seal. I always heard the factory MLS gasket was .054 thick compressed.

My factory 2001 Z06 LS6 heads didn't have the notch but did have the graphite gaskets. Now I'm running the AFR 205 59cc with the MLS gaskets, no problem yet.

Sep 11, 2005 | 08:07 PM

#12

phils C5 vette

Thread Starter

Le Mans Master

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From: Tampa Fl

St. Jude Donor '12-'13-'14

Quote:

Originally Posted by connecticut

Id like to see what the mill is and compression of the AFRs

Texas speed said they take off .007 for each CC, so .035 off = 61CC ish

also thanks speedy

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