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Old 06-24-2019, 04:48 PM
dmarr35 dmarr35 is offline
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Default 427 copo Holly jeting

Does anyone know what the stock jetting was on the 1969 camaro COPO
Holly 3959164
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Old 06-24-2019, 09:19 PM
L78racer L78racer is offline
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Holley 4346 shows 68 pri. 76 sec.
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Old 06-26-2019, 11:18 AM
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Thank you
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Old 07-01-2019, 01:25 AM
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Knowing that Don's car is a M40. I did not feel this is out of place here...
As a side question regarding COPO L72 M40 carbs,
Do they use a larger squirter size for the primary squirters?
IF so what is the size difference?
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Old 07-01-2019, 03:14 AM
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If the carb would have come with a different size squirter, it would have had a different part number.
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Old 07-03-2019, 02:00 PM
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I contacted Holly to get the stock jetting and all stock info for the carb they said they have none it is to old can you believe Holly has no info on a carb they produced!
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Old 07-03-2019, 02:07 PM
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I am installing the stock cam they changed the jetting and power valves for Drag do you know if GM changed or altered the jetting when installing on their engines all I want is to star off at stock so when I first start up I can bring the engine to 2000 for cam break in it just makes me crazy Holly can not or will not help with info
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Old 07-03-2019, 05:31 PM
earntaz earntaz is offline
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As indicated by L78Racer ... stock pri jets are 68s and the secondaries are 76s. The stock accel pump discharge nozzle is marked 25 ... hope this helps ... TAZ
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Old 07-03-2019, 09:19 PM
L78racer L78racer is offline
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They show 8.5 power valves for pri and sec. I have a pdf file listing Holley carbs and parts specs. If anyone needs a copy you can email me at [email protected].
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Old 07-05-2019, 05:53 PM
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Thank you Great help !
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