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
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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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…..)
One of the two last patches for the Old Chevy. The only two patches I bought, since the compound curves are still developing in my skill set.
I hate bodywork.
Read More: The Crusty Chevy – Tremclad and a Roller
Joyous fun pulling a crease out of the front fender with my nifty vice-grip-slide-hammer tool.
Read More: The Crusty Chevy – Tremclad and a Roller
Potato potato potato.
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Used headers (electrolysis rust removal and BBQ paint), 2-1/2″ pipes to the mufflers, and 2-1/4″ out the back.
Ford Windstar cooling fans next.
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Now to get it installed
Read More: Re-Ring the 350
Made my own piston stop and located true Top Dead Center (TDC) – new harmonic balancer was 1° retarded.
Checked the cam, and the duration was slightly different than the cam card (but the same as current specs). Cam needed to be advanced 6° to be in spec – good thing I degree’d the cam!
Heads went on with a Felpro 1094 steel shim gasket shortly afterwards.
Read more: Re-Ring the 350
New Speed Pro/Sealed Power .020 Hypereutectic flat top pistons to replace the dished cast stock pistons. So pretty.
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