Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Please help me dial in this Q-Jet

<< < (3/3)

Cliff Ruggles:
Manifold vacuum advance works poorly for all of the early low performance 350 Chevy engines with stock or near stock cams in them that I have tuned here.

They make PLENTY of vacuum with a normal base timing setting, and adding more timing lowers the throttle angle and often the tuner looses control of idle speed and has to start blocking off idle bypass air. 

Doing all of this has less transfer slot exposed, and can induce transition issues as well, which is aggravated by the lean idle mixture used with the additional timing.

The best news is that the engine will run equally as well everyplace on ported vacuum, as ALL the timing is in with the slightest movement of the throttle, or full vacuum right off idle......Cliff

Navigation

[0] Message Index

[*] Previous page