Iv heard that doing it with the engine warm can cause the plugs to sieze, however i thought the engine needed to be warm so the rings and stuff would be as the engine normaly operates. but howver i don't wanna be climbing in and under a hot engine with hot exhaust manifolds. all the cars iv done compression test on before iv done with engine warm, but then again they have all been 4 cylinders w\aluminum heads.

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series Muffler added to Unkown CatBack, Ported Intake

http://www.geocities.com/david_angel_16

 

i always hear that you do it when its warm, but i would be sacred of my headers too! i burnt the side of my hand really bad tring to check how rich i was running. soon as i touched it just melted