Is the spacer between the intake manifold and the carburetor really necessary? It's part number 48-3889 on Truck Parts & Truck Accessories for Chevy, GMC, Ford & Dodge Trucks | LMCTruck.com

 

1978 f250 ford 400

 

Essentially. The idea is to raise the carb off the manifold to help alleviate fuel boiling issues, as it keeps the carb a bit cooler.

 

X2 on the heat xfer and possible fuel boiling. Its is made of phonolic material for a reason.

The stock intake manifold is cast and will get hot and that heat can transfer to the fuel lines/carb, The heat build can boil the fuel before it has a chance to get to the carb.

Some say a old trick is to put a wooden close pin to prevent it....urban legend.

https://www.ford-trucks.com/forums/1...ue-how-to.html

 

The clothes pin trick actually works. I use it myself and have used it since about 77. I owned a 75 mustang 2 with a 351w and she would not run more than 20 minutes in summer before vapor locking. About 5 clothespins solved that. I have 4 on my 78 Bronco now.

 

I have a edelbrock intake I'm wanting to put on would I still need it?

 

Most auto parts stores sell them.

 

Yes you will need it.

 

The spacer not only insulates carb from heat, it also helps bottom end torque. Dont know if it is seat of the pants noticeable but it is measurable on dyno. Actually 1 of the cheapest performance upgrades you can do.