Category: My Projects

Vacuum Advance Limiter

by admin, posted in My Projects

For the HEI on the Crusty Chevy.  Currently running 20° base timing, 14° mechanical advance, 12° vacuum advance.  Once this is solid, I will change the power piston spring in the carb to stay closed at idle in gear (previously idling at 6inHg in drive).

Read More: The Crusty Chevy

Carbs are Easy

by admin, posted in My Projects

Just time consuming.

Completed all the tweaks, got it back together, and got it running.  Needs more Idle Bypass Air, so it has to come off again – but that’s easy.  Just time consuming.

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Throttle Shaft Bushing Install

by admin, posted in My Projects

Rochester Quadrajets are notorious for worn throttle shaft bushings, which result in tuning difficulties, among other things.

I found some 5/16″ ID, 3/8″ OD bushings are my local auto parts store ($2).  I machined a cutter from 3/8″ rod which I turned down to 5/16″ long enough to pilot the center bushing in the baseplate.  I used a Zip Disc to cut flutes and back rake.  I tested it briefly, but chickened out and just milled the bushings with a 3/8″ end mill.

I will likely test the cutter out on another Rochester I don’t value as much…..

Tomorrow, working through Cliff Ruggles’ book: “How to Rebuild and Modify Rochester Carburetors.”

Read More: The Crusty Chevy (May need to add a page on the fuel system – plans to go EFI soon…..)