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**71CHEVYSHORTBED402** · 03-01-2023, 12:57 PM

Info. for my 71 402 with a factory Rochester. Strikes me a 350 would be the same. Be nice to know if that cannister fits and works, so far I'm unaware of a replacement.

The vapor canister bracket mounts using the bolts for assembling the RH gusset to the fender.

The vapor canister belt secures the canister to the bracket using two 7/16" hex recessed head bolts with spin washers. The bolt threads are 1/4-20 x 1/2”, and the heads are stamped “S”. The canister’s ports face the rear.

The vapor canister hose connections are:

• A 1/4” ID fuel (PCV/EEC) hose connects to the canister’s “PCV” port with a pinch clamp, and to the vacuum tee in the PCV valve hose. The tee reduces the 3/8” PCV hose to 1/4”.

• A 5/32” ID vacuum hose connects to the canister’s CARB port with a pinch clamp, and to the carburetor’s vacuum port above the fuel filter fitting.

• A 5/16” ID fuel vapor (PCV/EEC) hose connects the canister’s TANK port to the lower vent tube with pinch clamps.

A black nylon strap secures the 1/4” and 5/32” vapor hoses to the A/C muffler assembly’s front line. The hoses route behind the compressor’s upper flange to the vapor canister. This strap secures the A/C compressor wire as well.

03-01-2023, 12:57 PM	#8
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,385	Re: Vapor canister Info. for my 71 402 with a factory Rochester. Strikes me a 350 would be the same. Be nice to know if that cannister fits and works, so far I'm unaware of a replacement. The vapor canister bracket mounts using the bolts for assembling the RH gusset to the fender. The vapor canister belt secures the canister to the bracket using two 7/16" hex recessed head bolts with spin washers. The bolt threads are 1/4-20 x 1/2”, and the heads are stamped “S”. The canister’s ports face the rear. The vapor canister hose connections are: • A 1/4” ID fuel (PCV/EEC) hose connects to the canister’s “PCV” port with a pinch clamp, and to the vacuum tee in the PCV valve hose. The tee reduces the 3/8” PCV hose to 1/4”. • A 5/32” ID vacuum hose connects to the canister’s CARB port with a pinch clamp, and to the carburetor’s vacuum port above the fuel filter fitting. • A 5/16” ID fuel vapor (PCV/EEC) hose connects the canister’s TANK port to the lower vent tube with pinch clamps. A black nylon strap secures the 1/4” and 5/32” vapor hoses to the A/C muffler assembly’s front line. The hoses route behind the compressor’s upper flange to the vapor canister. This strap secures the A/C compressor wire as well. Attached Images __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly guide (kit) for restoring this truck from the ground up, complete with details including full hardware descriptions. Much of the info. applies to all 67-72 GM. My build thread, with some info. about the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 03-01-2023 at 01:06 PM.