Clean out the passage under the intake.


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Posted by Chriscase on Saturday, July 18, 2009 at 09:41:34 :

In Reply to: 318 heat riser question posted by Tim Holloway on Saturday, July 18, 2009 at 07:15:47 :

The crossover passage can be plugged almost completely with carbon. I used to use an electric drill with a 1/2" bit.

The machine shop ought to clean the passages in the heads.

Copey is right about your manual valve being a bad idea. Not that you can't control it, but the spring pressure made the system act as a pressure relief- it could only block it just so much before pressure builds up and pushes the valve open. So unless you want to engineer a spring into the system, like a manual choke carb has, put it back to stock.

The spring is a bi-metallic strip, more heat makes the tension release, the same system is used in automatic chokes.



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