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Carl C
02-16-2006, 11:52 AM
Is the 496 motor shipped from GM with 496 ci or does mercury stroke them? If it is shipped that way, is it just a crate motor or is a 496 used in any GM vehicles? Thanks.:wrench:

RedDog
02-16-2006, 11:55 AM
Is the 496 motor shipped from GM with 496 ci or does mercury stroke them? If it is shipped that way, is it just a crate motor or is a 496 used in any GM vehicles? Thanks.:wrench:

I have a 496 (labeled 8.1 liter) in my 2000 Yukon XL. It is a standard GM block.

Carl C
02-16-2006, 12:24 PM
Thanks, Dog, that answers that. Now one more question please. On the 496 HO with closed cooling system are the exhaust manifolds raw water cooled?

RickSE
02-16-2006, 01:06 PM
This is always a good reference.
GM Powertrain (http://www.gm.com/automotive/gmpowertrain/engines/specialized/marine/index.htm)

Carl C
02-16-2006, 01:24 PM
This is always a good reference.
GM Powertrain (http://www.gm.com/automotive/gmpowertrain/engines/specialized/marine/index.htm) Very cool link. Thanks. I always thought that GM shipped automotive engines that were extensively modified by Mercury. What can I say, this is my first IO and apparently I've still got a lot to learn.:lookaroun

harbormaster
02-17-2006, 04:24 PM
The 496 manifolds are raw water cooled. The difference which adds to their longevity is that the joint between the manifold and riser is a dry joint.

The old style wet joint was the source of many a ruined engine from water in the exhaust.

The wet joint had water flowing up through a jacket into the riser.
The dry joint eliminates the upward water flow through the two pieces by using hoses between the riser and manifold.

Carl C
02-17-2006, 08:42 PM
Got it. Thanks Scot.