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Old 07-08-2013, 01:31 PM
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holley carb mainjet size

i have a 307 chevy enginge and my question is dose anybody know what main jet size to use i have a holley 600 cfm the jets in it right now are stamped with the number 49 and they are way to small i drilled them up and that made the car run better but would like to find the right size

the motor is original as far as i know

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Old 07-08-2013, 01:46 PM
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Basic Holley Carburetor Information
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Old 07-08-2013, 06:58 PM
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Wow 46s!! We don't normally drill jets, even if it makes them bigger, they don't flow properly.
Get a couple sets of jets Summit has them. Id start with 71 or 72s up front and maybe 74s in the back. Make sure you have a good power valve too. Stock probably 65
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Old 07-08-2013, 09:46 PM
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jets

Quote:
Originally Posted by Richiehd View Post
Wow 46s!! We don't normally drill jets, even if it makes them bigger, they don't flow properly.
Get a couple sets of jets Summit has them. Id start with 71 or 72s up front and maybe 74s in the back. Make sure you have a good power valve too. Stock probably 65
I think 71s are a little big,I might be wrong though?
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Old 07-08-2013, 10:39 PM
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Quote:
Originally Posted by vinniekq2 View Post
I think 71s are a little big,I might be wrong though?
You are correct according to the link I gave the OP.
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Old 07-09-2013, 12:43 AM
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From here: Holley lists the Holley 1850 (600 cfm vacuum secondary) as having 66 primary jets and a 134-9 secondary metering plate which is equivalent to about a 64 jet (orifice in plate is drilled to 0.067).
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Old 07-09-2013, 01:55 AM
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Quote:
Originally Posted by Richiehd View Post
We don't normally drill jets, even if it makes them bigger, they don't flow properly.
That's what I heard..



Duke
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