How to id Holley with choke horn milled off.. - Chevelle Tech
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  #1  
Old Apr 21st, 11, 8:53 AM
BowtieAaron BowtieAaron is offline
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Default How to id Holley with choke horn milled off..

I just picked up this Holley.
The guy said its a 750, it has 4 corner circuits on it.. But the choke horn was milled off

Is there anyway to tell what carb or cfm it actually is?







Aaron
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71 chevelle
355 10.3:1cr, brodix ik180 heads, voodoo hyd roller, holley efi intake, eMS-PRO, 60lbs dekas, ls tb, 700r4, 3.55 gears
Soon to be 7875 turbocharged!
368rwhp 383rwtq n/a with carb
12.23 @ 110 1.68 60ft
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  #2  
Old Apr 21st, 11, 9:44 AM
Dave427 Dave427 is offline
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Default Re: How to id Holley with choke horn milled off..

Looks like a 750, it has down leg boosters.
Sometimes you can get lucky and it might have 4779 on a metering block.
Do the throttle plates have 172's and 173's?
850's will have 180 on the throttle plates.
800's usually have a 50 cc pump in the rear.
600, 650, 700's all have straight boosters.

Dave
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  #3  
Old Apr 21st, 11, 9:51 AM
bracketchev1221 bracketchev1221 is offline
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Default Re: How to id Holley with choke horn milled off..

I was going to "guess" the same. The number on the butterfly is an identifier, and like was said, it looks like it has a 30cc rear pump arm. Other thing is, I'm pretty sure you can measure a bore diameter difference compared to your 650.
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Old Apr 21st, 11, 9:53 AM
BowtieAaron BowtieAaron is offline
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Default Re: How to id Holley with choke horn milled off..

Yeah the butterflys have 172/173 on them

I was just curious how to Identify, I could compare it to my 4777 and look in te Holley book.

Thanks guys

Aaron
__________________
71 chevelle
355 10.3:1cr, brodix ik180 heads, voodoo hyd roller, holley efi intake, eMS-PRO, 60lbs dekas, ls tb, 700r4, 3.55 gears
Soon to be 7875 turbocharged!
368rwhp 383rwtq n/a with carb
12.23 @ 110 1.68 60ft
Dyno video NA
http://youtu.be/PvZ7tDVyryw
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  #5  
Old Apr 21st, 11, 4:42 PM
wrenchbender wrenchbender is offline
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Default Re: How to id Holley with choke horn milled off..

Measure the diameter of the venturis & the diameter of the throttle bores. Then match up with specs in your Holley book.
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  #6  
Old Apr 21st, 11, 10:22 PM
RB69SS396Conv RB69SS396Conv is offline
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Default Re: How to id Holley with choke horn milled off..

The metering blocks often have the carb's list # stamped on them in some form or fashion... might be possible to deduce that, then look it up in the Holley listing
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  #7  
Old Apr 22nd, 11, 6:57 AM
blasttime blasttime is offline
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Default Re: How to id Holley with choke horn milled off..

Quote:
Originally Posted by wrenchbender View Post
Measure the diameter of the venturis & the diameter of the throttle bores. Then match up with specs in your Holley book.
X2 thats exacly what to do you can modify holleys to 4 circuit idle so keep that in mind.
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