One of the few times that I would ever disagree with Rick but I've gotta raise the BS flag on his Right Stuff (TRS) bemoaning. TRS is an OEM approved sealer and gasket maker for a lot of manufacturers for a reason. Going beyond that, I as well as many others here and other boards have used this stuff for a few years without having to use a "chisle and hammer or grinder" on disassembly. Then there's the "haven't seen it last that long" comment. If that is the case then you haven't looked very far. You only have to google the test results to know that TRS easily outlasts RTV. If you don't want to google just take a look outside. See any stock cars or trucks out there that are less than say 15 years old? Then you're most likely seeing the same compound in use and lasting 100s of 1000s of miles.
Here's a list of manufacturers that say it works:
Automotive OEM Interchange
The Right Stuff
GM 998 5990 998 5675
12378479 10953472
998-5990 998 5675
12346286 12345997
Ford WSE-M4G323-A6 TA30
Chrysler GF-44-A GF-44-B
MSGF-44B 04883971
Daewoo PS 9120016
Land Rover LRNA-25223
Mercedes Benz A0029897320
Mitsubishi 3M8663 3M8672
3M8678 3M8679
3M8661
Saturn 21019581
Toyota 00001-01001 00295-00102
00001-01002 00295-01208
00295-01282 00295-01281
004403007 TB1215
TB1207 TB1217B
3MT3#08670
Right Stuff GREY
GM 998 5943
Ford WSE-M4G323-A3 TA29
WSE-M4G323-A4
Chrysler GF-44-D 82300234
Honda 296380 08718-0001
296380 08718-0003
Heavy Equipment OEM Interchange
The Right Stuff
Caterpillar 4C9612
Detroit Deisel 23509603
Mack 5166-58730
International 1653885C1
Volvo GM V1111015
To take it even farther, some well-known engine builders here use it as well and have tested the living crap out of it with their own pocket-books. Does it set up fast? Yes, you need to have your fecal matter fully congealed before you go smearing it around. But, as soon as you bolt the thing together you have a full seal. There is no waiting around on curing time. Is it expensive? Yes, but you don't need a lot unless you ignore that other rule.
Bottom line; TRS is superior to normal RTV in all performance aspects and is only beaten in cost and lazy cure time.
Well, that's my rant for the year, Steve