Carb spacer question - Team Camaro Tech
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post #1 of 4 (permalink) Old May 3rd, 15, 09:40 AM Thread Starter
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Tony
 
Join Date: Jul 2005
Location: Clovis, CA
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Carb spacer question

I need to order a .500 spacer. I see there are different styles. With an Edelbrock performer RPM and speed Demon vac sec do I get the square bore open or the square bore with four holes? I called Summit from the road and sales guy shipped the open style after I told him what I had. So I went on their site and see there are options. Am I ok with open?

1969 Camaro SS350, original motor/12 bolt/interior and build sheet in Fathom Green.
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post #2 of 4 (permalink) Old May 3rd, 15, 10:45 AM
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Re: Carb spacer question

You'll be fine. Would be better with four-holer, but you won't know the difference.
Spacer can be drilled/tapped for 3/8 NPT for brake booster vacuum.

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post #3 of 4 (permalink) Old May 3rd, 15, 01:14 PM
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Re: Carb spacer question

Benefits of a four hole spacer is it smoothes out the pulses in the intake for better vacuum signal to the carb if your cam is too big for the street. An open spacer provides more plenum volume for peak horsepower if your carb is under sized for the engines demand or their isn't enough plenum volume to meet air flow demands (example being a dual plane used mostly at WOT the majority of the time, instead of a single plane). Both generally help, though both are a patch for the wrong size; or the wrong style intake manifold for your engine combination.

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post #4 of 4 (permalink) Old May 3rd, 15, 02:12 PM Thread Starter
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Tony
 
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Re: Carb spacer question

I called Summit and they are sending the four hole style now so I'll return the open. I love the tech support on this board! Thx for responses.

1969 Camaro SS350, original motor/12 bolt/interior and build sheet in Fathom Green.
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