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March 11th, 2003, 07:42 PM
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Stock Exhaust Manifolds
Were the stock exhaust manifolds 'dry mounted' (i.e. no gasket)? I took mine off to get the driver side repaired and there were no gaskets. All help Appreciated!!
1987 T - just starting to get her in shape for the summer! Thanks to all - I've learned quite a bit since I found this site.
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87 Turbo T - 9" K&N, 160 Thermo, RJC Power Plate, Walbro 340 hotwired, Adj FP Reg, #36, MAF Trans & Extender chip, Kirban braces, THDP w/Hooker dual exh.     
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March 11th, 2003, 07:46 PM
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From the factory they were.
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http://www.cardomain.com/id/Gussbuick Optima batteries not allowed beyond this point. Merritt Performance Hartline Performance PTS Xtreme Transmissions RJC Racing Alkycontrol alcohol kits TurboTweak chips G-bodyparts Full Throttle Speed
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March 11th, 2003, 08:41 PM
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Is it better/worse/no difference with no gaskets? Should I get a set or don't worry 'bout it? Thanks.
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87 Turbo T - 9" K&N, 160 Thermo, RJC Power Plate, Walbro 340 hotwired, Adj FP Reg, #36, MAF Trans & Extender chip, Kirban braces, THDP w/Hooker dual exh.
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March 11th, 2003, 08:47 PM
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I would do gaskets, it won't hurt anything. Really sucks if it leaks when your done without em.
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http://www.cardomain.com/id/Gussbuick Optima batteries not allowed beyond this point. Merritt Performance Hartline Performance PTS Xtreme Transmissions RJC Racing Alkycontrol alcohol kits TurboTweak chips G-bodyparts Full Throttle Speed
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March 12th, 2003, 12:07 AM
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They will leak with a slight warp on the flange. I have gaskets on mine, because a pre-turbo leak will kill performance
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Bob D .040 over block - n/a crank - hypers stock turbo/IC/blue tops Yes, I am an alcoholic http://bobdittmar.tripod.com/blown87combobs1987buickgrandnational/index.html
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March 12th, 2003, 12:59 AM
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the gaskets are not really needed...i replaced my ds header with a replacement postons header and used no gasket...seals perfectly...i also do not use gaskets on the turbo flanges...everything is bare metal to metal...no leaks here
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-Don  87' Grand National 2nd owner, originally bought in 1998 with 26k miles bone stock, car now has about 120k Best E.T. 11.07 @ 125 mph with stock motor combo, destroyed original block  Car currently under construction, new stroker 109 combo in the works (again), should be finished for spring 
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March 12th, 2003, 02:05 AM
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It helps to lap the headers tube faces flat, before you install the headers. I use a 6" sharpening stone I got from bargain depot 8 years ago for $2.50.
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UNGN My OOOOOLD Timeslips Page My OOOOOLD G-body Homepage 1986-87 Illustrated Parts Book Wil's Power Wheel Page
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March 12th, 2003, 11:36 AM
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I think the amount of heat produced would kill gaskets and warp flanges
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86 GN, THDP, 3" Torque Tech dual. SOLD and in a dealer showroom '84 Monte Carlo SS 88 Corvette Coupe 88 LeSabre T-Type
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March 12th, 2003, 02:35 PM
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Quote:
A lesser gasket may be susceptible to heat dmg. Also keeping the header bolts properly torqued is important
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Bob D .040 over block - n/a crank - hypers stock turbo/IC/blue tops Yes, I am an alcoholic http://bobdittmar.tripod.com/blown87combobs1987buickgrandnational/index.html
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March 12th, 2003, 03:01 PM
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if 2 flat surfaces have always been bolted together then they wont wap
If you do put a gasket in it it will be hard to get them flat again since the gasket will give when you tighten the header up alowing the flange to warp. I also donot run gaskets I just used a strait edge with self stick sand paper to go across the flages to insure they are flat keep in mind you cant blow a metal to metal joint but you can blow a gasket if you really want it right have the machine shop plane the flanges to be perfectly flat
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85ttype 87 powered (resting) , 78 elcamino turblo bruick powered Eastern Virginia Turbo Buicks From Stock To Stage All Types of Buick Repairs Or Mods business is closed ... relocating to jax. florida soon
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