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Discussion Starter #1
I don't know why I keep getting stuck on this. Hopefully someone with some knowledge will chime in.
I'm near finishing my 388 build and want it to look as clean/factory as possible.

I would like to run vintage Chevrolet script valve covers without breathers or PCV. Instead I would like to use a 1967 Corvette filler neck that has a breather & PCV on it.

Will I be properly vented with that? Or did the factory vent from another location I'm not aware of.

Thanks!
 

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hey Matt, been wonderin when we gona see some pics..

back in the olden days they had a Road Draft Tube was at the back of the block,
with the breather vent on the front oil fill tube..

no it wont really work right with the vent and pcv at the same place..
it will keep it from over-pressure and blowing seals, but not really a cross flow setup..

you could put the pcv other places kinda hidden, like back of the block,
thru the intake floor, but they will need a good baffle to collect the oil mist
and drain it ..
 

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Discussion Starter #3
Hey JJ

Thanks for the info!

That's what I figured was the case--but I wanted so bad for it to work out the other way.
I have to see what kind of ports I have on the block to utilize.
I may just go to with the factory 68 set up with breathers/pcv in the valve covers. Seems to be the easiest, just not the look I like.

Anyways here are a couple pics.
Not much to show, I always forget to take them in the moment.
Paint on the block turned out lousy, my fault.
Heads are at the shop getting looked over at the moment.
Really all I need is a few gaskets, the roller rockers, pushrods, and hydraulic lifters, then I'm golden.
Everything else I have and/or is slowly being painted.




 

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For info, the PCV uses vacuum to pull oil fumes out of the engine. For this to happen, it needs to have a fresh air inlet on the opposite side of the engine. That's why you see the breather on one valve cover, and the PCV on the other. Without the fresh air, the Vacuum can start to pull oil instead of fumes thru the PCV.
 
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I don't know why I keep getting stuck on this. Hopefully someone with some knowledge will chime in.
I'm near finishing my 388 build and want it to look as clean/factory as possible.

I would like to run vintage Chevrolet script valve covers without breathers or PCV. Instead I would like to use a 1967 Corvette filler neck that has a breather & PCV on it.

Will I be properly vented with that? Or did the factory vent from another location I'm not aware of.

Thanks!
hey Matt, been wonderin when we gona see some pics..

back in the olden days they had a Road Draft Tube was at the back of the block,
with the breather vent on the front oil fill tube..

no it wont really work right with the vent and pcv at the same place..
it will keep it from over-pressure and blowing seals, but not really a cross flow setup..

you could put the pcv other places kinda hidden, like back of the block,
thru the intake floor, but they will need a good baffle to collect the oil mist
and drain it ..
I was looking into this also and came across this video ...
 

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Discussion Starter #6
I was looking into this also and came across this video ...
I like what I'm seeing! I have to see if this is a possibility on the intake I used. I could tack or blind tap a baffle on the bottom of the intake.

Now tell me, what are your thoughts on running a PCV from oil filler tube to carb, then having my breather be mounted at the back of the intake? That way I don't have to run a vacuum line from the front of the carb, to the back of the intake.
 

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x2 Ted
.
Now tell me, what are your thoughts on running a PCV from oil filler tube to carb, then having my breather be mounted at the back of the intake?
that will work.. its not hidden tho..
and/or just pipe/hose the breather/vent to the bottom of the air filter, for filtered air
keeps dirt out and burns the mist from WOT..
youll have to run a newer style oil fill tube cap that's sealed..
PIC Search
.
.
if the pcv is in the rear intake floor, or back of the block
run the pcv hose to the carb big rear port..
the push-in breather will be on the oil filler tube, all hidden, old-scool look..
you will get a some oil mist out of the breather at WOT tho..
.
and depending on the setup, check out the adjustable pcv's
Adjustable pcv


and the cast aluminum covers seal so much better than the steel ones..
See the source image
 

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Discussion Starter #8
x2 Ted
.

that will work.. its not hidden tho..
and/or just pipe/hose the breather/vent to the bottom of the air filter, for filtered air
keeps dirt out and burns the mist from WOT..
youll have to run a newer style oil fill tube cap that's sealed..
PIC Search
.
.
if the pcv is in the rear intake floor, or back of the block
run the pcv hose to the carb big rear port..
the push-in breather will be on the oil filler tube, all hidden, old-scool look..
you will get a some oil mist out of the breather at WOT tho..
.
and depending on the setup, check out the adjustable pcv's
Adjustable pcv


and the cast aluminum covers seal so much better than the steel ones..
See the source image
I didn't realize there is a port on the back of my Qjet. Ever since I swapped to HEI I have no reason to be under the hood that much anymore. I miss points.

I'll run the pcv in the back.

Unfortunately those vintage, even reproduction, cast aluminum script covers are out of budget.
 

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a lot of Qjets have the port on the rear with a adapter, some have a plug,
some you drill/tap or drive a slip-on-hose port in the hole..

you can drill/tap the rear intake plenum too, and some intakes all ready have the port..

yea its better not to send all the oil mist to the one rear #8 cylinder,,
use that port for other vacuum sources..
.
Unfortunately those vintage, even reproduction, cast aluminum script covers are out of budget.
don't forget the original 50's valve covers only fit 50's heads,
the bolt pattern is different on one side, bolts are closer together..

that's ok tho, they wont fit over roller rockers anyway..
these will
Tall Plain VC

with these on top
Chevy Script

don't forget these
Good VC Gaskets
used to buy these for 5$..
 
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