Carb question

Rumble nailed it. Per theory, a stock 350 does best with a 500. Now change the engine- more cam, more flow, needs more cfm. But, over-carb: the vacuum signal to the carb changes, affecting the metering. This screws your whole world up. The carb doesn't know what to do.

This goes back to us installing cams, and putting bigger carbs on. Yeah, got a cam. The idle and total advance now has to be changed. The carb? probably too big. The solution? drill holes in the primaries, replace the power valve.

Yes, get the hg( more $, but it works), get vacuum up, with timing once you learn a vacuum gauge, you forget about a rpm gauge.

Then work on carb. An example, and I will get my butt kicked for this statement; 440, mild cam, 9.0; Eddy 1405 and 1406, ran out of rods and jets ever made, trying to make your eyes stop burning. Non-tunable.


Holley- dis-connect the secondaries. Put aroun, and nail it- read plugs, and adjust accell pump. Hook secondaries, full run. read plugs.

If you feel/hear the secs come in. that was a bog. Need bigger jets on sec, or during the transition, need secs to start later.

And still idle load-up? underneath the secs is a screw, open up the secs more.

First time I tried to tune an Eddy, loved the "no gas on manifold" But Eddy doesn't make the parts to fine tune. Back to the old Holley stuff.