Blocking 351C heat ports.
Freshman User
Joined: Jul 2000
Posts: 34
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Blocking 351C heat ports.
I read an article by Dan Jones, "Some basics of Cleveland Building" in the Mustangs and More website. In the article he states "Retain the turkey pan unless the carb heat ports are blocked." Has anyone ever blocked the carb heat ports? This sounds like a good idea. I have not run across this suggestion before, and I have been reading everything I can find on the Cleveland family. Comments?
Elder User
Joined: Jun 1999
Posts: 861
Likes: 0
From: SE PA
Blocking 351C heat ports.
I had done this at one point in time to a 351M (heat risers blocked), ran very poorly whenever the weather got below 45 deg. or so(on the choke waaaay too long). The "turkey pan" does not allow as much heat to be transfered to the intake, thus, if you have the heat risers blocked off, you will need this extra heat when the temps fall. For all out performance, you want a cooler air/fuel charge to make more power, for economy and drivability, you want to warm the incoming air/fuel for a better burn when colder outside. The fuel/air mix will stay in "vapor" form better when warmed, when cold, the fuel wants to form droplets-thus the need for enrichment when cold-to make up for what falls out of the mixture. I've run with the heat risers open and no valley pan with an alum. intake, no problems in the summer with vapor lock and did much better in the cold. I think this has more to do with personal choice (what you want from the engine) and what type of weather/distance you drive in that weather, for making a choice of what to run. Hope this helps!
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