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| | | | Joined: Apr 2009 Posts: 181 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 181 | Hello, what is the correct way to connect vacuum to a 283 distributor? The vehicle is a 58 Spartan with a 283, with vacuum for the hydrovac coming from the manifold. The former owner had "t-ed" into the hydrovac line to gain vac for the distributor, but I'm not sure if that was the original setup. Would this compromise the available vacuum for the distributor advance? Thanks for any insight that you may have.
1955 GMC 630, 1959 GMC W660, 1958 Chevy Spartan 80
| | | | | Joined: Jul 2000 Posts: 2,195 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,195 |
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
| | | | | Joined: Apr 2009 Posts: 181 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 181 | Yes it does help....thanks! I do see a port with a small brass plug which looks to be about in line with the area just above the throttle plate. I will try hooking the vacuum to that port and see if there is a difference (it performs good right now at medium to high rpm, but hesitates notably when initially stepping on the gas). Note that my Chilton's and Motor's manuals describe the 2G carb in detail but do not mention or illustrate the port in question.
1955 GMC 630, 1959 GMC W660, 1958 Chevy Spartan 80
| | | | | Joined: Feb 2016 Posts: 1,989 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,989 | jaycoop, does your carb and distributor have the factory vacuum/centrifugal governor?
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| | | | | Joined: Apr 2009 Posts: 181 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 181 | Good question, there is no governor. Perhaps should have mentioned this earlier, but the farmer who i purchased this truck from blew the original '58 283 and replaced it with this one which is from a 1964 sedan....so, the current motor (complete, including the 2 bbl Rochester carb and distributor which came with it) is not original to the truck.
1955 GMC 630, 1959 GMC W660, 1958 Chevy Spartan 80
| | | | | Joined: Feb 2016 Posts: 1,989 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,989 | You will probably then want to use ported vacuum from the base of the carb.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| | | | | Joined: Apr 2009 Posts: 181 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 181 | Thank you....that will be the plan!
1955 GMC 630, 1959 GMC W660, 1958 Chevy Spartan 80
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