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Blown, OHBA Member
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Discussion Starter #1
Am looking to buy 2 660 cs but a flag has gone up, the carbs I am looking at have rear meetering blocks.???? I thought 4160s only had primary blocks. Is this something someone has done to them or did holley do this.could someone with an understanding of these carbs tell me whats up with this,could use some input before I buy thanks.

Don
 

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Are they set up for dual feed too? Mine came stock setup as 4160s, but I swapped out for dual feed bowls and and dual metering blocks. I think its pretty common.
 

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Blown, OHBA Member
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Discussion Starter #3
carbs

I talked to a holley tec today. He told me that it was common for people to change them from 4160 to 4150 but if they didn't know what they were doing they could screw them up. Something had to be drilled on the throttle body before the secondary idel screws would work. He also told me that milling the choke horn messed up the flow through the primaries, said it's better to remove the choke plate and leave the tower.
Soooooo since I dont know who did the alterations I decieded to buy 2 new 650 DPs. Oh yes the towers were milled off these carbs also.
damn the luck
 

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Brendella 2" Runner NoS
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I ran dual 660s myself, the added 2ndry meter block replaced the metering plate. Holley used plates to save on space and had a transfer tube feeding the 2ndrys vs a separate line to the bowl. Most blocks have 5800 or 5802 markings on them, very common for this setup. You may also want to look at the linkage being progressive or 1:1. I believe that most (all) 660s were 1:1. So your carbs are 4224 (http://www.holley.com/0-4224.asp) but doublecheck, you may have 4223s, I am running a pair of these, they are 850cfm center sqr's, but 1 3/4 throttle plates. Also look into your accel pump, if you are running a single pump, go with a 50cc vs a 30cc if you are going to race. ref old 1973 Holley book show this 4223 carb as a 1 3/4 bore base plate and being 850 cfm carb.. Page 76.
 

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You might also consider the list #6109 750 double pumpers. They are commonly used in pairs inline and have a much more progressive linkage for non-race applications and have metering blocks on both ends stock. We used to sell a lot of those.
 

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let me second the motion on those 6109`s. been running a pair of them since 1982 and planning on running them forever. they`re on a 468 in a tx-19.
 

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Blown, OHBA Member
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Discussion Starter #7
6109s

No longer seem to be available from holley any other sugestions
 

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Gone
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1,833 Posts
Am looking to buy 2 660 cs but a flag has gone up, the carbs I am looking at have rear meetering blocks.???? I thought 4160s only had primary blocks. Is this something someone has done to them or did holley do this.could someone with an understanding of these carbs tell me whats up with this,could use some input before I buy thanks.

Don
In my shop (not my stuff) is a pair of 660's that have been modified with 850 base plates and 850 metering blocks and float bowls. I know they worked fine, started, ran and idled fine.
The guy is going to blown so he is going to sell them. If you have interest just pm me.

I think the 6109 750's are not available anymore. Last I found for a guy were used but we saved them. We had to pay a whole lot more than we thought we would. Excellent carbs.
 
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