bowtie racing

As you guys know its impossible to fit PCV valve on aluminium corvette script valve covers. And since i had ZZ4 crate engine ,there is no way to use road draft tube for breathing.

First i made a hole for the valve and rubber grommet.





Then i made " oil well " from aluminium tubing. It has diver plate which keeps stainless mesh (side of the manifold) above the pcv valve . Tube was welded on the manifold and sealed with epoxy.





Then bolt on splash shield from aluminium sheet metal.



And finished it with stainless allen head bolts and safety wire



So far - about 1000 miles - it has worked well without any sign of oil suction.

66jack

Nice
But should you have put more hole in the splash shield for drainage?

66jack

bowtie racing

There are two 5/16" holes on both ends. I know was it enough when i take the intake off next time.

midyearvette

that's a great modification and fab-up work....

66jack

I seen those holes, they just don't look that big.
Maybe some holes in the corners would help, if needed?

66jack

C-1 Generation 2

QUOTE/

As you guys know its impossible to fit PCV valve on aluminium corvette script valve covers.

I wouldn't say impossible!

I do have a PCV valve on mine.

I do like how you fabricated it into the intake and still make a nonstock engine appear stock.

Chicago Pete

You have some skills, looks great!

Frankie the Fink

I considered using stainless steel "scrubby pads" in my PCV line oil separator but I got real nervous about metal particles getting in the engine. Other than that concern (which could be paranoia on my part) its a nice looking job...

toddalin

I would (actually I did) make the shield to cover the entire inside bottom of the manifold to keep the hot oil from splashing up onto the bottoms of the intake runners. The lifters sling a lot of hot oil around.

As long as you're down there anyway, may as well take further advantage of the situation and work you are doing.

AZDoug

Those two holes are fine, this is in the lifter valley, there isn't that much oil flying around in there.

That oil separator is overkill as compared to a factory can, I don't see any oil suction with that.

I simply drilled a hole in the rear web of the block and tapped it 3/8" NPT and put an elbow, a piece of 1/2" ID rubber hose and a PCV valve inline in teh hose, and into a tapped hole into the manifold under the throttle body, with no oil separator at all, my oil consumption is about 1 qt per 1000 miles, which includes a small leak at the rear of the pan, which to me is acceptable.

Doug

nassau66427

Nice job.

In my Tech Inspector days, I'd have snipped those safety wires with a pair of dykes and let you try it again. Good thing that's not a helicopter part.

street62

I did the same thing almost on my 67. when I came off the back of the block I hooked up to a hose that goes to the air cleaner. The pvc is on the oil fill tube from the factory. It looks like the way it came from the factory. The things you must do to run a 350.

GUSTO14

bowtie racing... congratulations on a terrific fabrication job. What attention to detail....
The shop I help out at on weekends has a customer that is having his '75 Corvette restored and he fell in love with the Corvette script covers. In order to deal with the PCV issue, we found these valve covers at PML...

http://www.yourcovers.com/valve_covers_11026.php
You can see the indentation on the side of the cover (on this '63 chassis) where you can machine a hole to insert the PCV valve. We inserted the PCV in the right cover and a draft tube in the left cover that goes up to the bottom of a mid-year air cleaner base. The draft tube is unhooked from the air cleaner and swung vertical to add oil to the engine on his '75 as he has no oil fill provision on the front of his manifold either.
Here is what the underside of the cover looks like...

These covers are much more substantial than stock aluminum covers and can be ordered raw, powder coated or polished if you like.

Good luck... GUSTO

bowtie racing

I totally agree...Otherwise there were not many of them left..




Those covers looks really nice. Thanks for the tip Gusto.


Here is rest of the case.

Mako72

Great idea and fab work!

Larry N. Johnson

BOWTIE RACING:

Excellent work and detail. Congrats and thanks for posting!!

GUSTO14
Neat website for valve covers!
They even have the script covers for the BB!!
Looks like a spot for the PVC valve, too.

vetteman64

I have the PCV part worked out with the PMI valve covers but currently stumped on how to add oil. I have a Chevy crate engine with Vortec heads but can't find an intake with a front oil fill tube or boss to add one. I found a shop that will build up weld material and then machine it to fit an oil fill tube, but if I can find the right manifold it would be cheaper and quicker. Any ideas?

C Ya, Joseph Rock
Frankenstein 59 & Grand Sport proto

al89

add the oil in the dipstick tube a little slow but it works
wayne

RFJohnston

I add oil through the PCV hole. No big deal. Funnel fits right in.

C-1 Generation 2

I have baffles from other small block valve cover and breather on right bank and PCV on right bank in-between the C and O on the valve covers.But after seeing the PML polished valve covers I ordered a set.