Reply to "Initial jetting recommendations - O-3310S Holley 750"

I would change the squirters to a 25 and the spring to the plain silver one.
The primary jets should be just about right as well as the secondaries.

That black spring will never fully open on a 351 unless you are turning 9,000rpm.

The 31 s are a big block squirter and tend to bog the engine off of idle a little.

Other then that you are close. I don't see a major problem with the carb numbers. Even the power valve ia about right.

Remember that if you are using the holley automatic choke thermostat that is a "universal" thermostat and will generally open too quickly.

I have found that the choke thermostat off of the 84 Mustang GT works very well. It is easy to get also as an aftermarket part.


And don't forget the fuel level settings. Too low and the carb leans out and too high and it floods. Don't take them for granted.

Remember the carb angle in the Pantera can be different and thus effect the correct fuel level setting.

Hope this all helps.