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Username Post: stock head gaskets thickness        (Topic#18667)
loudpedal 
Super Senior Member
Posts: 5010

Loc: corner of Walk & Dontwalk...
Reg: 07-28-00
Re: stock head gaskets thickness
09-05-02 10:15 AM - Post#123387    
    In response to mr wabbit

There were no steel shim head gaskets used on factory assembled SBC motors from the 80's, as the heads were all of lightweight casting design and there was insufficient support for the shim head gaskets.

The typical FP replacements are .039" compressed.

Detroit Gasket (now Corteco) has (used to have a composition head gasket of about .025" compressed that will work on the later lightweight heads. The .021" compressed shim head gaskes aree still availiable from many suppliers but are a problem when used with lightweight heads unless the motor is done right.

 
Anonymous 

Re: stock head gaskets thickness
09-05-02 01:07 PM - Post#123388    
    In response to loudpedal

The Impala version of the LT1 used a thin head gasket I believe, but the cooling passages were different. I think you want the FelPro 1094 gasket that compresses to about .020. The old factory steel gaskets compressed to about .022 I think.

 
DragRacer383 
Super Senior Member
Posts: 4807
DragRacer383
Age: 6
Loc: Arkansas
Reg: 07-17-01
Re: stock head gaskets thickness
09-05-02 03:15 PM - Post#123389    
    In response to

[QUOTE]Originally posted by loudpedal:
[B]There were no steel shim head gaskets used on factory assembled SBC motors from the 80's, as the heads were all of lightweight casting design and there was insufficient support for the shim head gaskets.


With all you read about using them with the light weight heads you wouldn't think they did. I know for a fact that they used them up to 84. This past week i tore down a 82 and 84 305 both had factory steel shim gaskets. every main was spun in the 82 so the need for the 84.

------------------
84 Silverado
84 Z-28
86 Mustang SS , 383 100 shot of N20 6.9 in the 1/8www.geocities.com/poorboysspeedshop

Later,Glen


 
mr wabbit 
Super Senior Member
Posts: 3535
mr wabbit
Loc: IL
Reg: 02-26-02
Re: stock head gaskets thickness
09-05-02 03:55 PM - Post#123390    
    In response to DragRacer383

well when i removed the 624 heads of this engine it had the steel shim gaskets on it, so,,,,, its an 85 burb, so,,,
thanks though.

why would thinner casting head mean that thinner gasket couldnt be used ? that doesnt even make any sense.
what does thinner gasket or not have anything to do with casting of a head? ?

just trying to learn all i can...

thanks

Randy
Lincoln Il
1982 Trans Am WS7
305 TH350 7.5" for now
http://smg.photobucket.com/albums/v298/fast68/ra nd...


 
mr wabbit 
Super Senior Member
Posts: 3535
mr wabbit
Loc: IL
Reg: 02-26-02
09-05-02 09:10 PM - Post#123386    

what thickness are the factory installed mid '80's steel shim head gaskets and wjat thickness are the blue fel pro repacement composite gaskets and can napa or autozone get anything thinner ? were there any SBC engine applications ever that used any thinner gaskets from factory ?
im sure others would like to find out some info on this, please direct me to any threads
you may know of that already discuss some of this maybe

thanks

------------------
Randy, Lincoln IL
fastr68@yahoo.com

Randy
Lincoln Il
1982 Trans Am WS7
305 TH350 7.5" for now
http://smg.photobucket.com/albums/v298/fast68/ra nd...


 
ZZiggy 
Senior Member
Posts: 655
ZZiggy
Loc: Joplin,MO
Reg: 04-18-02
Re: stock head gaskets thickness
09-06-02 03:14 AM - Post#123391    
    In response to mr wabbit

stock chevy gaskets are 0.018" fel-pro blues are 0.039"
71 Camaro 355 NA
11.1650 @ 119.30
1.5028


 
mr wabbit 
Super Senior Member
Posts: 3535
mr wabbit
Loc: IL
Reg: 02-26-02
Re: stock head gaskets thickness
09-07-02 09:32 PM - Post#123392    
    In response to ZZiggy

over twice as thick ??? why they do that for ???
they cant make composite ones that thin, or ??

so how can anyone get any thinner ones without having to order any ?

damn...

thanks

------------------
Randy, Lincoln IL
fastr68@yahoo.com

Randy
Lincoln Il
1982 Trans Am WS7
305 TH350 7.5" for now
http://smg.photobucket.com/albums/v298/fast68/ra nd...


 
Anonymous 

Re: stock head gaskets thickness
09-08-02 02:36 AM - Post#123393    
    In response to mr wabbit

The Mr.Gasket standard rebuild gasket set contains the steel head gaskets, whole set for under 30 bucks. (This was correct last year anyway.)

 
Desertvette 
Member
Posts: 94

Loc: Las Vegas, NV,USA
Reg: 08-15-01
Re: stock head gaskets thickness
09-08-02 05:33 AM - Post#123394    
    In response to

GM has a .026 composite gasket p/n 3830711. ROL HG31600 .025 steel shim from performance gasket.com less than $20. Victor 1178ssb .020 stainless steel available Napa special order about $40. and Mr Gasket 1130 .018-.020 available from Summit about $20.00. Have heard as stated not to be used with lightweight castings as far as the steel shim goes. That's why I listed the GM composite. Might just be what you need and fairly thin
Bob

 
mr wabbit 
Super Senior Member
Posts: 3535
mr wabbit
Loc: IL
Reg: 02-26-02
Re: stock head gaskets thickness
09-08-02 09:30 PM - Post#123395    
    In response to Desertvette

i need to go for a thinner composite one, i need to get hold of local dealer and see about that GM comp one,. hmmm...

thanks

Randy
Lincoln Il
1982 Trans Am WS7
305 TH350 7.5" for now
http://smg.photobucket.com/albums/v298/fast68/ra nd...


 
SteveStreeter 
Needs to Get Out More Member
Posts: 8394
SteveStreeter
Loc: Kettle Falls, WA. USA
Reg: 01-19-01
Re: stock head gaskets thickness
09-09-02 03:33 AM - Post#123396    
    In response to mr wabbit

The Felpro #1094 is a .015" compressed thickness and has no stipulation as to which heads it works on. This is a rubber like coated steel shim gasket. The only stipulation is for surface irregularities. The surface must be free of defects.
Steve


 
mr wabbit 
Super Senior Member
Posts: 3535
mr wabbit
Loc: IL
Reg: 02-26-02
Re: stock head gaskets thickness
09-30-02 12:05 AM - Post#123397    
    In response to SteveStreeter

thanks
Randy
Lincoln Il
1982 Trans Am WS7
305 TH350 7.5" for now
http://smg.photobucket.com/albums/v298/fast68/ra nd...


 
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