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Mar 9, 2018 | 05:04 PM

99redc5vette

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Headgasket

I am in the middle of doing my cyl heads on the procharged corvette.
I believe stock gasket is .052" compressed. I want same thickness/bore size as stock. I see couple options as to headgasket choice. cosmetic. mls ect.
I have attached 2 links, pretty much same specs, I am picking up arp headbolts so I want good quality headgasket.

http://www.jegs.com/i/Cometic-Gasket...791+4294828856

http://www.jegs.com/i/Mr-Gasket/720/...791+4294828856

what y'all think?????

Mar 10, 2018 | 12:41 PM

99redc5vette

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Anyone??

Mar 10, 2018 | 01:31 PM

feeder82

Safety Car

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From: Wisconsin

Can't go wrong with Cometic

Mar 10, 2018 | 03:40 PM

itsslow98

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From: Bel Air Maryland

Ls9 gaskets are the go to

Mar 10, 2018 | 04:23 PM

C5 Pete

AMP Racing

Joined: Aug 2006

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From: Washington TWP NJ

2023 C5 of the Year Finalist - Modified

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St. Jude Donor '09-'10-'11-'12

Quote:

Originally Posted by itsslow98

Ls9 gaskets are the go to

I’d agree with this right here. ^^^

Mar 10, 2018 | 09:27 PM

feeder82

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From: Wisconsin

Really? that sounds like a great way to have carbon build up and hot spots in the uncovered areas between the block and heads

Mar 10, 2018 | 11:43 PM

99redc5vette

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I have heard mixed reviews on the LS9 headgasket.
Couple .100 thou bigger bore size also. Which probably be ok but not sure would prefer tighter bore clearence.
However heard best for boost.

http://www.jegs.com/i/Chevrolet-Performance/809/12589226/10002/-1

VS
http://www.jegs.com/i/Chevrolet-Performance/809/12622033/10002/-1

Feeder you have heard bad review w the ls9???

Last edited by 99redc5vette; Mar 11, 2018 at 12:03 AM.

Mar 11, 2018 | 08:45 AM

feeder82

Safety Car

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From: Wisconsin

no reviews, just doesn't make since to me to have a head gasket .10 bigger than your bore size.

Last edited by feeder82; Mar 11, 2018 at 08:47 AM.

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Mar 11, 2018 | 09:49 AM

vettenuts

Team Owner

Joined: Mar 1999

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From: At the beach in little Rhody

Why not the stock GM MLS gaskets? Very forgiving. Thick with a supercharger, I would upgrade to the ARP studs.

Mar 11, 2018 | 11:44 AM

#10

99redc5vette

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Ya I am running 12psi give or take and see everyone loves the Ls9 for its durability to handle boost. GM MLS gasket you are reffering to the part#12589226?? I heard this gasket used in 10psi supercharged setups with no issues. I mean probably both be good but I want the best since I dont want to do this job anytime soon! Hoping some more people will give some more feedback from there personal experiences with these gaskets.

Mar 12, 2018 | 08:01 AM

#11

JHrinsin

Drifting

Joined: Sep 2017

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From: Avon Lake OH

Here are the head gaskets for the LS1/6 engines. Using a head gasket for the 4.000" or larger bore engines is not truly recommended on the smaller bore LS1/6 engines;

12498543 '97-01 graphite composite gasket LS1/LS6 3.905" bore, 0.052" compressed, 10.2cc volume
12498544 '02-04 MLS head gasket LS1/LS6 3.930" bore, 0.053" compressed, 10.5cc volume
C5475-051 Cometic MLS head gasket LS1/LS6 3.910" bore, 0.051" compressed, 10.03cc volume
C5475-040 Cometic MLS head gasket LS1/LS6 3.910" bore, 0.040" compressed, 7.9cc volume

Last edited by JHrinsin; Mar 12, 2018 at 08:03 AM.

Mar 13, 2018 | 10:25 AM

#12

helga203

Le Mans Master

Joined: Jul 2010

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Head

I ran 23ish lbs of boost with mls gaskets for years once I started running 30lbs boost they started pissing coolant and still ran it this way gr8 a few yrs. Changed to ls9 and so far hold good.