Studytime

iTrader: (15)

I searched, but didn't find the exact information I was looking for. I want to use a notched gasket on a late model 241 head. I know you can't do the opposite of that, but will it hurt anything to use a notched gasket on a non-notched head for a stock bore motor?

They are .042" (x 4.00") graphite gaskets.

Ben T.

GuitsBoy

iTrader: (4)

Yes.

A friend of mine is running the mr. gaskets which have the notch partitioned out. He has 241 heads.

Studytime

iTrader: (15)

Just what I needed to hear Guits. Thanks guy.

Ben T.

YankeeVert.

Are you talking about 5713G & 5714G. If yes they will fit. However when I called their tech line last month they told me it was .055" thick. Today after reading this post I called again and they told me it was .042" thick. I just googled the part number and the parts book list it as .051" thick. Take your pick I would hate to install them and then find out they are the wrong thickness.

NOTE: I canged rhe part #'s on 12/7/06 @5:30 pm

http://go.mrgasket.com/pdf/gaskets.pdf page 136
'

Studytime

iTrader: (15)

Hmmm... what's the gasket bore on a GM MLS gasket? These might not be such a good idea. Do you have the phone number handy? Thanks YankeeVert.

Ben T.

YankeeVert.

Phone:216.688.8300
ext. 500
8:30 a.m.-5:00 p.m.
Mon.-Fri. EST Address:
Technical Service
Mr. Gasket Company
10601 Memphis Ave. #12
Cleveland, OH 44144

Long Beach

iTrader: (51)

Yes you can +1

YankeeVert.

I called the tech. line again today.I explained the differences in thickness as noted above. The tech assured me that .042 was the correct thickness. I kept asking again and again and explained what a difference it would make in CR. He told me he had his finger on the part number in the in house data book and not the online data book. .042 is correct.

Studytime

iTrader: (15)

Sounds good Yankee, for complete confirmation, I'll call sometime soon too.

Thanks,
Ben T.

YankeeVert.

Sounds good. That will give me added confidence. Please post your findings.

Thanks

Dick

GuitsBoy

iTrader: (4)

Having seen them and mls gaskets side by side, they looked a bit tighter. I believe the .042, though i havnt mic'd them myself.

Studytime

iTrader: (15)

Just measured one of them and it's around .056-.059 UNCOMPRESSED. So, hopefully it will shrink a lot.

What does a MLS gasket spec at uncompressed? I think I have one laying around somewhere... I'll go see if I can find it.

Ben T.

GuitsBoy

iTrader: (4)

Im surprised that the Mr. Gasket is so fat... I would think the graphite would compress but not that much. Did you measure the firering? If not, go back and measure that, since thats the part that matters most, the rest is just filler. The fire ring usually only squashes a couple of thou once compressed.

I dont know what the MLS mic's out to uncompressed, but afterwards, its usually around .054. Would like to hear what it reads before compression if you get the chance to measure...

Studytime

iTrader: (15)

Duh . That's a good point Guits, I'm not sure why I was measuring anywhere else. Guess I just wasn't thinking. That's acually the only place I should have been measuring now that I think about it.

I just measured an uncompressed thickness of 54.5E-3 inches, so I think we can safely conclude it's in the 40s compressed.

I'll measure the MLS gasket when the windchill is out of the teens. Give me a while on that one.

Also, the bore is advertised as 4.00", but it's actually a little shy and closer to GM LS1 bore. It measures <3.97" in each cylinder in multiple locations. I would have thought uncompressed it would have been a little fatter than the bore. Guess I was wrong. That really doesn't make sense to me.

Anyway, I predict these gaskets are going to increase in popularity now. They're less than $60 for the pair, and have a compressed thickness of 10 thousands less than a GM MSL with the same gasket bore.

Ben T.

GuitsBoy

iTrader: (4)

Yeah, they should tighten up. Do they have a rubberized coating over the fire ring as well? If so that will definately compress. I know the MLS gaskets have a coating, I cant recall if those composites have it too.

Studytime

iTrader: (15)

Yes, they have a coating. Be it moly or rubber, I don't know, but they are definitely coated.

Ben

Studytime

iTrader: (15)

Is there any caviot that would make these gaskets not seal a 243 head?

Ben T.

YankeeVert.

They will fit a 243 head. I am going to use it with my PP LS6 Stage II heads.Also the last tech that I talked to told me the bore was 3.97 so maybe he was right on the .042. What was the tickness you measured on the fire ring?

The Sad

iTrader: (8)

I don't know much about head gaskets, will these from Mr. Gasket work on a 99 block with 5.3L heads?

Irocss85

iTrader: (1)

hmm, good find. maybe I'll try these bad boys instead of the expensive cometics. you guys think they'll handle 150 shot of nitrous too? also I wonder what the uncompressed GM graphite gaskets thickness is. if you think the MR gaskets will compress .012", then the GM gaskets should be in the .064 range uncompressed right? hopefully I have one at work on the shelf I can mic. real quick. if so I'll post up that # for everyone.