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Old 08-30-2010, 08:49 PM
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ahhudgins ahhudgins is offline
MC Maniac
Join Date: Jun 2009
Boat: 79 S&S. 87 Prostar Powerslot. Present 95 Maristar 200VRS
Location: Virginia
Posts: 2,547
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I checked the manifolds on my 95 this summer because a poster had a similar question as yours. Using an infrared thermometer, the temperature varied at different points all over the manifolds and risers. My engine used the 143 degree thermostat (which I have since changed to the 160) and I got readings from 115 to 160 depending on exactly where I put the thermometer. Placing my hand on top of each riser, I can feel a little difference in the temperature. The only way to be 100% sure that you don’t have a blockage is to remove the riser and check. I’m not a big fan of the compressed air method. If there was a piece of old impeller in the manifold water jacket, blowing air into may have only moved it around.
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