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Old 03-03-2015, 10:14 AM
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Holley 4160 primary jets

Hi.

Bought a new 4160 Holley vacuum secondary for my stock Chevy 350...!
I want to bolt it on the Weiand squarebore intake but i'm not sure if the jets which company put in the carb is suitable for stock 350?!
Would you tell me the size of the jets on 4160 Holley and which size give me good mileage and performance?!

Thanks.

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Old 03-03-2015, 02:50 PM
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Quote:
Originally Posted by Buick b4 View Post
Hi.

Bought a new 4160 Holley vacuum secondary for my stock Chevy 350...!
I want to bolt it on the Weiand squarebore intake but i'm not sure if the jets which company put in the carb is suitable for stock 350?!
Would you tell me the size of the jets on 4160 Holley and which size give me good mileage and performance?!

Thanks.
Do not make any changes until you bolt it on and try it.
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Old 03-03-2015, 02:53 PM
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Thanks Tommy!
I have a Edelbrock 500cfm too,not sure which is better !!!
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Old 03-04-2015, 03:49 AM
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Originally Posted by Buick b4 View Post
Thanks Tommy!
I have a Edelbrock 500cfm too,not sure which is better !!!
What list number is the Holley?
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Old 03-04-2015, 10:17 AM
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If its a holley 1850 or 80457 and is the 600cfm vacuum secondary then it comes stock with a 65 primary jet and that is the carb I have used for many years on my mild 350 small block chevy builds and has never let me down even compared to more expensive knock off holley carbs. As far as what jets are good for mileage a lot depends on your engine combo along with what type of transmission and rear gearing etc. On my holley I run 66 primary jets for what gives me good mileage but that is one step richer then stock. Usually if the carb is tuned right for your engine combo usually you might go no more then 4 sizes bigger or smaller then what holley has it at stock settings. Basically you have to see what your engine wants.
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Old 03-04-2015, 01:56 PM
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Quote:
Originally Posted by eric32 View Post
If its a holley 1850 or 80457 and is the 600cfm vacuum secondary then it comes stock with a 65 primary jet and that is the carb I have used for many years on my mild 350 small block chevy builds and has never let me down even compared to more expensive knock off holley carbs. As far as what jets are good for mileage a lot depends on your engine combo along with what type of transmission and rear gearing etc. On my holley I run 66 primary jets for what gives me good mileage but that is one step richer then stock. Usually if the carb is tuned right for your engine combo usually you might go no more then 4 sizes bigger or smaller then what holley has it at stock settings. Basically you have to see what your engine wants.
X2, often on milder builds where mileage is a concern, I jet down to 59 or 60 and use the two step power valve. Makes the Holley get mileage almost like a Q-Jet on a 350 of 300 to 350 horses.

Bogie
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Old 03-05-2015, 08:44 AM
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The part number is 0-80457SA Holley 4160.
Engine is a stock head 1976 Chevy 350 with mild cam with dual exhaust.
Sir,i guess my Quadrajet has 68 primaries,i think the 65 jets is good for Chevy 350!
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Old 03-05-2015, 10:02 AM
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Originally Posted by Buick b4 View Post
The part number is 0-80457SA Holley 4160.
Engine is a stock head 1976 Chevy 350 with mild cam with dual exhaust.
Sir,i guess my Quadrajet has 68 primaries,i think the 65 jets is good for Chevy 350!
OK that is a newer style 600 cfm Holley.

Either carb would be fine for your situation. It really comes down to a matter of personal preference. I like Holley's but many people prefer and have good results with Edelbrock.

You may want to take a look at which one would be easier to install based on your current fuel line and throttle cable arrangements to help you decide.
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Old 03-05-2015, 11:17 AM
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I have that exact 80457 sa holley sitting on my 350 as we speak. That is the aluminum version and its the same as the old 1850s and 80457s model numbers but they are zinc but all else being the same are the same carb just different material and a manual choke or a electric choke as well. There nice carbs for mild builds.
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Old 04-01-2015, 09:53 PM
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Quote:
Originally Posted by TommyK View Post
Do not make any changes until you bolt it on and try it.
right
you first install the carb on your engine and run engine to 50km then check your spark plug : if light your jetting is small if dark your jetting is high and if light with brown your jetting is correct .
before mounting carb in your engine do not change any things .
Certainly for tuning and testing the carb use vacuum geage not your ears !!!


Quote:
Originally Posted by Buick b4 View Post
Thanks Tommy!
I have a Edelbrock 500cfm too,not sure which is better !!!
holley is better .

where are you ( city )? call me i'm in iran and can help u my friend .
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Old 04-01-2015, 10:19 PM
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Baseball, hot dogs, apple pie and chevrole... WHAT? you are BOTH in IRAN??! wow, yer killin me!
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Old 04-02-2015, 05:35 AM
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Quote:
Originally Posted by Buick b4 View Post
Engine is a stock head 1976 Chevy 350 with mild cam with dual exhaust.
Sir,i guess my Quadrajet has 68 primaries,i think the 65 jets is good for Chevy 350!
. The '76 350's have an actual compression ratio way down around 7.6:1 and tend to get about 9 MPG city and 13 MPG hiway no matter what carb.'s you run... some better pistons and better engine quench distance can bump that up to like 17 city and 23 hiway...

. A good Q-Jet carb. will get better MPG than any of the others...
.
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