Large rpm drop

RustyRatRod said

That one is kinda small for that is what I was thinkin.

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My first 340 had a comp cams 280H in it. Flat top p[istons in the hole. Not knowing other ways, and with an old school stock elim racer as my mentor, I drilled the throttle plaates of my 3310 to get the idle speed down. Worked great until I tried drive up a gentle hill., LOL. So we stuck some wires into the idle air bleeds to get the off-idle corrected. Eventually got the machine shop to turn some small bleeds and pressed those in.

Now I know that more initial timing and a little fiddling with the idle mix screws probably would have brought the throttle plates into the proper range. And then no messing of the airbleeds would have been needed either. No holes in throttle plates of my current version of that carb, even witha slightly more radical cam. :)