Originally Posted by cdminter59
I would change thermostat first to eliminate that as a problem. I have read a lot of post with the same problem of hesitation when using the Edelbrock RPM AIR GAP. It is not a good intake to use in cold weather so with the temperature running so cold that is probably the problem. If you can get the temperature up to 190-195 it will probably run better. Experiment with the timing try setting the initial at 16-18 degrees. You will have to limit the mechanical advance to 18-20 degees. What are your camshaft specs? What distributor are you using? Read this Wiki article on setting your HEI and timing. Also there is a section in the article on adjusting the transfer slot on Holley carburetors. Increase the initial timing and close the front throttle plates. http://www.crankshaftcoalition.com/w...EI_distributor
. BTW you will need a timing light with advance.
Your right the air gaps start to frost in the plenum and carb venturies about 40 degrees! In Michigan it even freezes the throttle shafts on cold days stuck at speed !!!! Not a good thing
Its a warm weather intake there should be a warning on the box when a person goes to buy one LOL