ORIGINAL: clubin
It can be done in the car, but it is so much easier to remove the engine from the car. Cleaner, easier access to everything. Remove it. It is the easiest way to go about doing a pot swap. Get yourself a copper base gasket .020'' and some anerobic sealer avaible at any parts store.
http://www.permatex.com/products/Aut...et_Maker_b.htm
Resist the urge to use any type of silicone.
Why is silicone bad? I just bought a tube of [link=http://www.permatex.com/products/Automotive/automotive_gasketing/gasket_makers/auto_Permatex_Ultra_Copper_Maximum_Temperature_RTV _Silicone_Gasket_Maker.htm]this copper sealant[/link] because I saw it used in a video on sealing nitro engines. Am I using the wrong stuff, or is it fine? I've never actually used any sort of gasket maker with any of my engines before, but I also haven't used copper gaskets till very recently.
1/5 scale mad man, putting on a new head kit is pretty easy, I can guarantee that you'll have little to no problem handling it. If I can handle it, anybody can. Team Fast Eddy has a great series of youtube videos that give a step by step of how to disassemble and reassemble an engine. [link=http://www.youtube.com/watch?v=e0aFZ1ACrsE]Here's the first vid.[/link]