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Old 07-20-2010, 07:57 AM
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Carb bore sizes

Anyone know the difference in bore sizes between the Edelbrock 800 AVS and the 1407? I can't find this info anywhere and Edelbrock seems to not have an email addy anymore.

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Old 07-20-2010, 08:06 AM
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The 1407 is a 750 cfm and the avs is an 800 cfm. The AVS carbs have adjustable secondaries that don't require tools or springs.
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Old 07-20-2010, 09:18 AM
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Quote:
Originally Posted by bigdog7373
The 1407 is a 750 cfm and the avs is an 800 cfm. The AVS carbs have adjustable secondaries that don't require tools or springs.

I know this. I need to know the bore sizes. But than for the response.
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Old 07-20-2010, 04:42 PM
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Quote:
Originally Posted by Greg T
Anyone know the difference in bore sizes between the Edelbrock 800 AVS and the 1407? I can't find this info anywhere and Edelbrock seems to not have an email addy anymore.
Toll-free tech line, dial 'em up....
http://www.edelbrock.com/automotive_.../contact.shtml
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Old 07-20-2010, 05:55 PM
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Quote:
Originally Posted by techinspector1
Toll-free tech line, dial 'em up....
http://www.edelbrock.com/automotive_.../contact.shtml

Unfortunately, I tried that and the first guy didn't know and didn't know where to find the info, the second guy told me he didn't have time to look it up, and the third time I called there was a 20 minute wait in the queue. So I was wondering if someone knew off the top of their head.
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Old 07-20-2010, 06:00 PM
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Quote:
Originally Posted by Greg T
Unfortunately, I tried that and the first guy didn't know and didn't know where to find the info, the second guy told me he didn't have time to look it up, and the third time I called there was a 20 minute wait in the queue. So I was wondering if someone knew off the top of their head.
Greg, I do not know the answer to that question for sure, but my gut tells me that the difference of 50 CFM between the two is caused by a difference in the boosters and not by a difference in the throttle or venturi diameter.

I would even expect the throttle diameter to be the same- even if there were a slight difference in the venturi diameter.
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Old 07-20-2010, 06:17 PM
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FWIW, I just called Summit, the tech "thinks" they're both 1-3/4" throttle diameter.

He also said replacement base plates are not shown for that carb. I thought that was a little odd- so don't drop your Edelbrock carb! lol
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Old 07-20-2010, 09:09 PM
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Originally Posted by cobalt327
FWIW, I just called Summit, the tech "thinks" they're both 1-3/4" throttle diameter.

He also said replacement base plates are not shown for that carb. I thought that was a little odd- so don't drop your Edelbrock carb! lol

Thanx much, Cobalt. I never thought to try Summit or Jegs. One of my questions to Ede tech was how they got from 750 to 800, and he couldn't even answer that. Doesn't surprise me, tho. Just about every time I called them thru the years with a question or two it seemed I knew more than they did.

The reason I wanted to know is because I have a 388 with an 800 AVS on it, but was wondering if I could a little better throttle response out of a 750 because of smaller bores. The engine runs very well, but an 800 I think is a bit of overkill for a street machine.

Thanx again!
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