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Username Post: What year did chevy stop putting draft tubes on engines?        (Topic#346540)
Eric_Gary132 
Contributor
Posts: 203

Age: 24
Loc: northern California
Reg: 01-27-17
08-12-17 10:54 AM - Post#2703878    

I'm curious. I was told that my 1962 truck didn't have a draft tube on it? It's a 283 engine I believe.

But on the back of the block, there's a hole by the distributor



Edited by Eric132 on 08-12-17 01:46 PM. Reason for edit: No reason given.

 




2blu52 
"16th Year" Silver Supporting Member
Posts: 18088
2blu52
Age: 84
Loc: Montana
Reg: 03-12-02
08-12-17 02:25 PM - Post#2703895    
    In response to Eric_Gary132

A wild guess but it would have been around 1960 or 61 when the first of the Pollution controls came into effect.

"PEACE IS THAT GLORIUS MOMENT IN HISTORY WHEN EVERY ONE STANDS AROUND RELOADING"

THOMAS JEFFERSON


 
DonSSDD 
Silver Supporting Member
Posts: 6588
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
08-12-17 05:35 PM - Post#2703925    
    In response to 2blu52

1962 cars had a draft tube, but you could get the PCV. 63's had PCV's and used the same hole at the back of the intake to run a PCV to back of carb.

As we all know, Calif. may have been different.

63 Pontiac Parisienne Sport Coupe(CDN Chev mechanically (409, 4 speed),62 Bel Air SC (sold), 59 El Camino (sold), 62 Bel Air SC(sold), 63 SWC Vette (sold),
Member #2194


 
raycow 
Honored Member
Posts: 26707
raycow
Loc: San Francisco, CA
Reg: 11-26-02
08-12-17 07:53 PM - Post#2703948    
    In response to Eric_Gary132

The draft tube port at the rear of the block lasted until about 68 and was used for PCV after the draft tube was eliminated. PCV transferred to the valve cover after 1968 when the port was removed.

Ray

There's a line between good and evil no wider than a razor's edge - D.S. James Hathaway quoting from The Night Keeper


 
Eric_Gary132 
Contributor
Posts: 203

Age: 24
Loc: northern California
Reg: 01-27-17
08-16-17 12:09 PM - Post#2704458    
    In response to raycow

Ray, mine has a port on the back and it looks like a pcv rather than a hole coming up from there.

But the port in the back is supposed to go to the carb, correct?

Because, as I told you before, the shop decided to go ahead and connect it to the valve cover.

And just today, when the mechanic started it to bring it out to us, he had to turn the key like 6 times for it to start, it wouldn't start. They did a compression test a few weeks back and it is good.

and the engine turned for a couple of seconds before he finally got it running. And now the engine is all of the sudden running sloppy and rough as compared to before.

This NEVER happened before the shop did this. The truck would start up literally within a second on the first turn of the key.

They're a new shop by the way. They've only been in business since 2013. We chose them because they're close by.



Edited by Eric_Gary132 on 08-16-17 01:00 PM. Reason for edit: No reason given.

 
Eric_Gary132 
Contributor
Posts: 203

Age: 24
Loc: northern California
Reg: 01-27-17
08-16-17 04:16 PM - Post#2704485    
    In response to raycow

We removed the hose from the valve cover and now the engine sounds better. And it started right up so hopefully what the shop did, didn't damage anythig in the long run.



 
DonSSDD 
Silver Supporting Member
Posts: 6588
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
08-16-17 04:35 PM - Post#2704492    
    In response to Eric_Gary132

This is the kit for a PCV on a 63, or for adding it to ant SBC or W with a draft tube.

The round rubber plug fits in the hole which the RDT was, the metal pipe is connected to the PCV, the PCV connects to the base of the carb at the back via a fitting. This creates vacuum and sucks gases out of the intake and feeds them into the carb to be burned.

I think the valve covers blow, they don't suck. The rest of this setup is an oil fill tube breather cap. There are evolution's of this setup, but this one is the simplest one.



63 Pontiac Parisienne Sport Coupe(CDN Chev mechanically (409, 4 speed),62 Bel Air SC (sold), 59 El Camino (sold), 62 Bel Air SC(sold), 63 SWC Vette (sold),
Member #2194


Edited by DonSSDD on 08-16-17 04:36 PM. Reason for edit: No reason given.

 
Eric_Gary132 
Contributor
Posts: 203

Age: 24
Loc: northern California
Reg: 01-27-17
08-16-17 07:22 PM - Post#2704509    
    In response to raycow

the tube that the shop connected to the valve cover is sucking air.



 




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