Carb Spacers - Impala Tech
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post #1 of 5 (permalink) Old 10-01-2015, 10:41 AM Thread Starter
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Carb Spacers

Does anyone know the limits on carb spacer height (1/2", 1" 2") before hood clearance becomes an issue on a 1963 Impala?

Motor is 95' truck block converted to all roller 350, intake Edlebrock performer, Carb Holly 750 double pumper, 3" air cleaner. Stock motor mount position.

Assistance greatly appreciated.

M
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post #2 of 5 (permalink) Old 10-01-2015, 11:47 AM
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Since the 1963 was offered with a big block under the hood that is at least two inches taller than a SBC there should be ample room for at least a two inch spacer. If you are running a taller than stock intake such as the Edelbrock RPM Air Gap then you are back to near to the height of a BBC in that, that manifold is 1.7 inches taller than a stock intake. Not worry, you can easily run a two inch dropped base air cleaner off of a Corvette or Camaro Z/28 that had a high rise manifold in stock trim to still close a flat hood.

Big Dave
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post #3 of 5 (permalink) Old 10-01-2015, 12:45 PM Thread Starter
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Thanks Dave for the good information. I was a little worried about putting a dent in my newly painted hood.

I had to add a 1/2" fitting under the backside of the carb for the PCV valve vacuum line. Naturally, you have to raise the carb 1/2" to make it all fit. What a bad design this intake is...I'm sure it was designed for the Edlebrock carb and not the Holly.

Thanks again for the insight!
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post #4 of 5 (permalink) Old 10-01-2015, 01:40 PM
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Quote:
Originally Posted by msp177 View Post
Thanks Dave for the good information. I was a little worried about putting a dent in my newly painted hood.

I had to add a 1/2" fitting under the backside of the carb for the PCV valve vacuum line. Naturally, you have to raise the carb 1/2" to make it all fit. What a bad design this intake is...I'm sure it was designed for the Edlebrock carb and not the Holly.

Thanks again for the insight!
Why I think you could be correct; imagine that!

You had two other options depending upon the fitting you needed to install. I had need of only a small hose as I removed the power brakes and just milled down the top of a solid brass fitting that had the needed hose barb on an "El" to clear the under side of my Holley carb.

The other option would be to set up the manifold and drill and tap a new hole else where and plug the old hole with a hex or square recessed drive to seal the hole and clear the carb. Moroso sells a bunch of different sized pipe plugs for this purpose.

http://www.summitracing.com/parts/mo...FdQYHwodKucFxA

Aluminum is used for intakes and heads by racers not only to save weight but because it is so easy to machine or weld this material.

Big Dave
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post #5 of 5 (permalink) Old 10-01-2015, 10:46 PM
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Quote:
Originally Posted by msp177 View Post
Does anyone know the limits on carb spacer height (1/2", 1" 2") before hood clearance becomes an issue on a 1963 Impala?

Motor is 95' truck block converted to all roller 350, intake Edlebrock performer, Carb Holly 750 double pumper, 3" air cleaner. Stock motor mount position.

Assistance greatly appreciated.

M
One way to determine how much 'room' you have is to place a few inches of modeling clay, or similar soft material, on top of the air cleaner, close the hood gently and measure the deflection of the clay.

Hope this is helpful.
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