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Author Topic:   Warm 406
Dirt Newbie

Total posts: 1
posted August 27, 2001 11:26 AM
I'm having a heating problem with my 406. The engine races fine at 190 but when the yellow comes out or I'm sitting in line waiting to be scaled after the race the temp just slowly keeps creeping up and up. We pour water on the rad in the pits and it instantly goes down. Funny thing is I had this same combination on a 355 block: same pump, fan, rad, heads ect and I had no trouble at all. The steam holes are plugged, good Canton oil pan, 17" steel fan with about 1" clearance to rad. Stewart stage 3 water pump, no themostat, timing at 34 degrees. I thought it could be the jetting but that would show up under power not at idle. Any suggestions?
Thanks in advance.

Dirt Roller

Total posts: 20
posted August 27, 2001 05:25 PM
Idle mixture adjusted too lean?

Dirt Full Roller

Total posts: 75
posted August 27, 2001 05:54 PM
What kind of Ignition system do you use? I had an MSD hei that did the same idle the timing would retard so much it would heat up..the phasing was off...

Dirt Full Roller

Total posts: 74
posted August 27, 2001 08:45 PM
Try running a fan shroud, make sure you adjust the fan blade so it is about 1/2 out of shroud

Dirt Forum Racer

Total posts: 81
posted August 29, 2001 03:06 PM
Skip down to "new 400 owner" where they talk about steam holes. Someone said in there that the engine only needs them when running below 3000 rpm for extended time. This may be part of it?

booting left
Dirt Roller

Total posts: 10
posted August 29, 2001 11:21 PM
try putting in a restrictor plate in the thermostat housing 11/16 hole. or cut an old thermostat and try it

Dirt Roller

Total posts: 14
posted August 30, 2001 09:11 PM
My dealings with 400's would say it's your plugged steem holes.

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