Technical Chevy 283 PCV.....

I've purchased a 283 the had the PCV fittings plugged with RTV!.....Can I change this fitting for the earlier type?

 

Like this....

 

And do I need to fit a baffle?

 

The original cast profile is for a road draught tube not a PCV.

https://classicparts.com/1956-67-pcv-draft-tube-assembly-s-b

There is a conversion kit
https://www.ecklers.com/chevy-pcv-valve-kit-small-block-with-metal-elbow-1955-1957-57-351851-1.html

 

Thank you kindly!....The 283 dates from 1963, would it have originally had a draft tube or PCV?

 

Not sure. I thought all 283s had a draught tube.

 

If you go to a road draft tube you will definitely need the in block baffle.

 

The answer is yes to both of your question's. You have to install the baffle and you can use the fitting shown. Not sure why the baffle was removed in the first place.

 

I always did/do a pcv system using what Chevy offered...

 

The virgin '64 283 I tore down last year had the hose nipple in the road draft tube hole, baffle and an inline PCV valve. It will go back the same way, if I ever get it back from the machine shop.

Gary

 

I think 62 was the last year for road draft tubes. The fitting you show in your second post is what you want to run PCV. You also need to have another opening, hopefully there's a tube sticking up at the front of the intake manifold, with an open breather cap on it?

Just because someone had a 67 with a draft tube, doesn't mean that's how the car was originally built.

oh-- i looked in the Chevy parts book, 1962 was indeed the last year for the draft tube, it's part number 3776635 in group 1.762 if you want to look it up yourself.

 

Stock 283-327’s from 62-up used the little teapot fitting and internal baffle until they went to the valve cover system and changed the blocks.

The PCV valve screwed into a 90* fitting at the rear of the carb base. The early valves were cleanable the replacements are not. A Standard V100 is readily available and will work fine on almost all engines with a threaded fitting.

These parts were used on a y-block Ford with dual quads. A 3/8” hose with many bends is available at Auto Zones at the back of the store near all the “Help” products…none of this is rocket science. The valve is a serviceable NOS found at a swap meet.

 

I think there is some confusion. There are three breather systems used in the 60s. The original draught tube that vented to atmosphere down below the motor, this evolved into a vent that connected to the air cleaner housing so vented back into the top if the carb and the third type that is actualy a PCV that uses manifold vacuum.

 

There are "open" and "closed" PCV systems. The open ones have an open breather cap. The closed ones vent to the air cleaner. They both use vacuum and a PCV valve.

 

The PCV valve setup on a Rochester 4GC from a '64 327 .

 

My 327/325 hp (same as 350 hp).
66/67 style.




The odd one is the 1965 Corvette that most people outside the Corvette group do not know about, it did not use a pcv, instead, it had a metered orifice in the carburetor body.

 

Here's the baffle that goes in the valley to prevent oil from blowing out the pcv or draft tube:
https://www.jalopyjournal.com/forum...lator-breather-nos-or-nors-chevy-sbc.1307896/

 

You definitely want the baffle in the lifter galley at all times. As for the pcv fitting, I have a rubber valve cover grommet in the back of the block on mine.

 

This and what Bob Lowry showed. in post 9.

Soon after Chevrolet (GM) switched from road draft tube to PCV valves you could buy the kit that Bob showed at the Chev garage parts counter and maybe through local parts houses. I installed a few of them in 64/65 in high school auto shop when someone brought one in and had us install it and word got out that you could have it done to your small block and get rid of the fumes from the road draft tube. Guys in their 70's and older can remember those cars with blow by pulling up beside them at a light and having a cloud of blue smoke come out from under the car.
That grommet will work if you have the baffle in place and working but if you don't have the baffle oil tends to get splashed to the PCV valve.
I've also cut a few road draft tubes off and set them up to run a PCV valve setup. Easy to do but can look a bit clunky if the engine is out in the open.

 

What carb do you intend using? If it is one with the fitting for PCV you can't just plug it and run a draught tube, the carb is metered for this air and a PCV system must be used. JW

 

Where are you located? I have some of that stuff you can have.

Pat

 

I need these pieces for my Corvette my rubber piece is broken. I would also like to get the kit that is pictured above. Does anyone know where I can get these pieces and what the part numbers are?

 

I'm not sure why the baffle was removed either?....Perhaps to fit an aftermarket intake manifold?

 

Thanks!.... PM sent.

 

I dad to modify my baffle when i swapped on a Edelbrock Street Master, leaving it off was not an option. JW

 

I'm thinking I'll fit a small Holley, something like a 390 perhaps?.....And yes, I want to run the PCV system.

 

Cool, the PCV systems are easy to set up correctly if you know how they work and what not to do and to then pretend they do. JW

 

Thanks

 

I'd like to use an Edelbrock performer 2101 intake (because I already have it), is it possible with the oil baffle in place?