Could someone please post a pic of how the thermostat housing gasket is supposed to go on? Im no sure which way the tab is supposed to be, Thanks.

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2000 Pontiac Bonneville SE
1997 Oldsmobile Eighty Eight LS
1993 Buick Regal GS Coupe
1992 Buick Regal Limited Coupe

The paper one? It doesn't really matter as long as all the holes line up.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
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If it's anything like my 1997, many people don't even use a paper gasket. They just spread on a little Permatex and bolt it down. But I used a paper gasket. I just forgot to actually put the thermostat in the housing before I bolted it up. Had to undo / redo it all.

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PontiacDad at WCBF `08: "By any chance, was his name. . .Radomir?"

R.I.P. 10/31/15: 1997 SE: "Silver Shadow"
`05 Mercedes S500

I just used the o-ring it came with. No RTV or gasket. The o-ring should angle down, like the base of the t-stat, as it's set in the housing.

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Bye Bye:

RIP sandrock

An L27, due to it's age, should always use the paper gasket. Most are pitted around that surface. The paper gasket should be forward towards the radiator, and it will only point either left or right when installed so the holes line up. The 2 bolt holes and thermostat hole are not symmetrical in the gasket like the Series 2. So as mentioned, it will really line up only one way.

Ultimately, the tab doesn't matter. You can cut it off if you want. Just make sure all 3 holes line up correctly.

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Messn with my mind posting like that - 1 hole for the thermostat, and 2 for the bolts - I'm goin' duh - what's the 3rd hole for? lol!!!!

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In Memory of Brad - 1/21/1977 .. 10/23/2013 ...... Aaron - 1977 .. 2017 .....
2017 Hyundai Santa Fe Sport ..... 1992 Bonneville SSE 1SB 170 HP L27 4T60E retired/sold to MattStrike ..... 2005 Bonneville SE 1SC 205 HP L36 4T65E - retired/salvage yard ..... PBCF user 2321