427 copo Holly jeting
 

Does anyone know what the stock jetting was on the 1969 camaro COPO
Holly 3959164

Holley 4346 shows 68 pri. 76 sec.

Thank you

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?

If the carb would have come with a different size squirter, it would have had a different part number.

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!

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

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

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].

Thank you Great help !