Component selection.

[slowcamaro]

I have a HEI setup. 36* in by 3300 rpm.

I believe vacuum at "idle" was 10-12" mind you idle wasn't very consistant as I have yet to really get the carb very close at all.




So what i've gathered so far is that im likley not too far off on my jet sizes, but the power valves are off If my vacuum readings hold true once I have the idle closer to where it needs to be. I noticed you said 4.5 PV singular do you not run a power valve in the secondaries? How is this exactly blocked off and what benefits does one gain? Does secondary jet size need increased when this is accomplished?

I appreciate your respond, would you mind helping me find answers to my other questions, as you seem quite knowledgable on the subject. I'll try to make them more direct this time.

Needle and seats - The number or letter stamped on the flats corresponds to the size how? How does the numeric size of the needle/seat effect performance and which circuit does it affect. How does a "101" compare to a "H"?

Accelerator pump shots - I know how to identify these, but how do I select the correct size for the application? Should I be running 30cc primary and secondary or is the 50cc in the rear ok?

Any clue as to what the "31" could be in reference to? Would it be nozzle size? Im not findin much that includes the numbers "31" besides ".031 accelerator pump discharge nozzles"

Yes the 850 wouldn't have been the carb I selected if I was purchasing a carb new either, but I couldn't beat the price (free). And at the time I was a broke college student who spent every penny building the engine to pass the class. I'm assuming you meant a modified 750, which is likely where I would have began if I hadn't stumbled across this deal.