Road draft tube CONVERSION!

[Lugnutz65]

I’ve read lots of stuff about converting an engine draft tube to PCV. Some folks put a freeze plug in the big hole where the tomato can baffle goes and just use modern rocker covers with a breather and PCV system. Of course that works just fine and is an option that makes sense.

For me, I wanted to use the original 283 Chevy script valve covers which don’t have a hole for a PCV or oil fill. The 283 oil fill tube up front has a breather cap already.

Vendors sell a road draft tube adapter. It wouldn’t be hard to fabricate a piece that would work just as well as what the vendors sell. Basically it’s a domed cap for the draft tube hole with a nipple on the side. Then you run a 1/2” vacuum hose to a PCV that connects to the carb base with a 45* or 90* fitting. That supplies sips of manifold vacuum to the road draft setup. I hope you like the pics.

[geezer#99]

Nice pics but that’s nothing new.
Chevy 327 had that as a factory set up before they went to the open valve covers.

[Lugnutz65]

Originally Posted by geezer#99

Nice pics but that’s nothing new.
Chevy 327 had that as a factory set up before they went to the open valve covers.

Not trying to say it’s a NEW idea. I took the pics to show people who don’t already know about this. I just have not seen it laid out with pics with details. I have my engine on a run stand where taking pics was easy.

[dagnabbitt]

Great looking engine.

[kaycee]

Buitiful engine and great pictures, I kinda did the same thing on both my 327

[mattfranklin]

I appreciate the very clear way you documented it.

Originally Posted by Lugnutz65

Not trying to say it’s a NEW idea. I took the pics to show people who don’t already know about this. I just have not seen it laid out with pics with details. I have my engine on a run stand where taking pics was easy.

[Accelo]

Look at the 1963 models, it is close to the system you have shown.
The adapter at the rear of the block looks like a reproduction of the one used on 63 models. Some of the Corvette's had a hose that comes off the oil fill tube and goes to the air-cleaner. If you use that system you don't need the breather on the fill tube. It can be caped like the Corvette. The fill tube is available in black or chrome from Corvette dealers. You could use either system. Just depends on the air-cleaner you prefer to run.