I have a 4160 Holley bolted to a stock 4bbl C5OE manifold on a mildly built 302. This carb sits on top of the factory aluminum spacer, but the carb gets plenty of heat soak. I am kicking around the idea of adding another plastic 1" spacer on top of the stock aluminum one to cut down on heating and perculation to the carb. Assuming I use gaskets between each spacer, and longer carburater mount bolts can this be done? In other words can a person stack spacers? The reason I would like to keep the aluminum one is for the PCV port. This is in a '56 F-100 so room under the hood won't be of a concern.

 

Normally the phenelic spacer used for heat soak is only 1/4-3/8" thick. I see no problems with what you're doing.

 

Thanks GFW! I appreciate you help!

 

This works better Mr. Gasket brand | Part #: 3710

 

That does look interesting LX! Are you running a kit like that, and do you like it?

 

Increasing carb height will also improve throttle response (low/middle rpm range).....We use to build heat cheilds (just like in the pic) out of aluminum or galv metal....that is really a true heat shield that will work.

 

Would this function as a heat shield as well?

Edelbrock 2732 - Edelbrock Carburetor Adapters - Overview - SummitRacing.com

 

Carb spacers & adapators do lift the carb a little higher off the intake manifold, which does reduce temps a tad, but that is not a spacer or adapters purpose....a heat shield actually deflectes the heat away from the carb.

Its like this.....

Lets say you are in aroom where the heater is set at 110 degrees.....
the closer you move to a open window, you get a little cooler air but you are still hot, but if you move out of the room into the hallway, you don't feel the heat because there is now a wall inbetween you and the heater.

 

This is not a heat shield. It is an adapter-

The actual heat shield shown-



...is better in that the fuel bowls on a 4150/4160/4180 hang out in the wind and will absorb more under hood ambient heat. This is the first step.