Carburetor Install question

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FlDart360

FlDart360

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Removed my carburetor today to do a bench rebuild and this got me thinking about how it was installed. I have an Edelbrock Air Gap intake manifold and a Holley 670 street Avenger. I am generally very happy about how the two work together this is what the previous owner installed. My question is should there be any type of spacer between the carburetor and the intake manifold other than just the gasket? Would there be anything gained by adding a half inch spacer or should I leave well enough alone.
 
Edelbrock 9266 Heat Insulator Gasket, this is highly recommended on this site

Watch the under hood height or you'll end up to high

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Run the track if possible. A spacer may possibly give a seat of the pants feel. Possibly! But the track show a bigger difference. It will also require retuning the carb.

So if you have the spacer, try with and without the spacer. And enjoy the challenge of finding HP.
 
Air gap has a generous plenum volume for a street car already. Every engine combo responds differently. IMO there are very few people out there that could science your build out on paper, and give you a definite answer. Its four bolts or nuts, not that hard to change, and it would be a fun day of test n tune. Just try it!
 
I run a 2'' spacer on a 418 mainly because my 950 hp has no port for a pcv valve and I had it laying around . when my engine was dynode, pulls were made with and without the spacer ,with the spacer there was a 3 hp increase through nearly the whole pull . so not much on my setup .
 
I run a 1" HVH super sucker and it improved my throttle response and evened out the fuel balance. #7 cylinder is my leanest and required secondary split jetting for even WOT 1/4 mile.
It takes a lot of testing to compare spacers and get the jetting right every time you swap to a different setup IMO. I ran no spacer, 1" open, 1"4 hole, 1" HVH 4 hole and the HVH is the best for my combo (340, eddy AG, Demon 750dp).
 
With the ball rest chin, fold back teeth and handle grip ears that come out at night!
 
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