350 with a draft tube??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rsmarr1982 · 07-19-2018, 06:28 PM

I recently bought a truck that has engine with a draft tube, when I ran the suffix code on the block "XA" it comes out to a 69 350, I thought draft tubes where gone by then.

**Steeveedee** · 07-19-2018, 08:26 PM

Gonna need to see pictures. From Wiki:

"Positive crankcase ventilation was first factory-installed on a widespread basis by law on all new 1961-model cars first sold in California. The following year, New York required it. By 1964, most new cars sold in the U.S. were so equipped by voluntary industry action so as not to have to make multiple state-specific versions of vehicles. PCV quickly became standard equipment on all vehicles worldwide because of its benefits not only in emissions reduction but also in engine internal cleanliness and oil lifespan."

So, without pics, I'll conclude that you have a pre- '64 block.

rsmarr1982 · 07-19-2018, 09:05 PM

I'll take a better pic of engine tomorrow.

**Steeveedee** · 07-19-2018, 10:48 PM

We'll need a shot from directly overhead to see the road draft tube boss on the back of the block. All I'm seeing here is the distributor hole.

toolboxchev · 07-20-2018, 03:13 AM

Looking at your block that is not the common 010 high nickel namesake number I see on the back.

AJC · 07-20-2018, 03:14 AM

The casting number looks to be closest to 3849852. which is a 1957 - 1966 283 ci.

Redneck Rydes · 07-20-2018, 08:19 AM

That would explain the hose coming from the top of the block at the back.I can't exactly remember but I think the hose would go to the air cleaner,early form of PCV, had that on my 1967 Beaumont with 283

**Steeveedee** · 07-20-2018, 08:34 AM

Quote:

Originally Posted by Redneck Rydes

That would explain the hose coming from the top of the block at the back.I can't exactly remember but I think the hose would go to the air cleaner,early form of PCV, had that on my 1967 Beaumont with 283

I missed the hose, yesterday- good catch! In the '60s in California, we started putting retrofit kits on the vehicles that came with road draft tubes. That's what you see there. We bored a hole in the air cleaner housing and routed the new hose from the new fitting in the back of the block. Then, since there were no openings in the valve covers, a hole was drilled in the filler neck tube and a PCV valve was put in line to the carburetor. In retrospect, that was not well thought out, because those carburetors were not calibrated for a PCV valve.

07-19-2018, 06:28 PM	#1
rsmarr1982 Registered User Join Date: Jul 2010 Location: mogadore ohio Posts: 867	350 with a draft tube??? I recently bought a truck that has engine with a draft tube, when I ran the suffix code on the block "XA" it comes out to a 69 350, I thought draft tubes where gone by then. __________________ 1969 chevy c10 lwb stepside 250 6 3 ott 1971 chevy c10 lwb 250 6 with power steering 3 ott 1972 chevy k20 4x4 350/TH350 automatic 1978 chevy Malibu 4dr 305 2bbl (all original) 1979 chevy k10 Scottsdale 350/th350 full-time 4wd(daily driver)

07-19-2018, 08:26 PM	#2
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,723	Re: 350 with a draft tube??? Gonna need to see pictures. From Wiki: "Positive crankcase ventilation was first factory-installed on a widespread basis by law on all new 1961-model cars first sold in California. The following year, New York required it. By 1964, most new cars sold in the U.S. were so equipped by voluntary industry action so as not to have to make multiple state-specific versions of vehicles. PCV quickly became standard equipment on all vehicles worldwide because of its benefits not only in emissions reduction but also in engine internal cleanliness and oil lifespan." So, without pics, I'll conclude that you have a pre- '64 block. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA Last edited by Steeveedee; 07-19-2018 at 08:32 PM.

07-19-2018, 09:05 PM	#3
rsmarr1982 Registered User Join Date: Jul 2010 Location: mogadore ohio Posts: 867	Re: 350 with a draft tube??? I'll take a better pic of engine tomorrow. Attached Images __________________ 1969 chevy c10 lwb stepside 250 6 3 ott 1971 chevy c10 lwb 250 6 with power steering 3 ott 1972 chevy k20 4x4 350/TH350 automatic 1978 chevy Malibu 4dr 305 2bbl (all original) 1979 chevy k10 Scottsdale 350/th350 full-time 4wd(daily driver)

07-19-2018, 10:48 PM	#4
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,723	Re: 350 with a draft tube??? We'll need a shot from directly overhead to see the road draft tube boss on the back of the block. All I'm seeing here is the distributor hole. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

07-20-2018, 03:13 AM	#5
toolboxchev Registered User Join Date: Jul 2015 Location: 2nd left past the stump on a dirt road. Posts: 2,629	Re: 350 with a draft tube??? Looking at your block that is not the common 010 high nickel namesake number I see on the back.

07-20-2018, 03:14 AM	#6
AJC Registered User Join Date: Jan 2017 Location: Le Sueur MN Posts: 209	Re: 350 with a draft tube??? The casting number looks to be closest to 3849852. which is a 1957 - 1966 283 ci. __________________ AJC

07-20-2018, 08:19 AM	#7
Redneck Rydes Registered User Join Date: Feb 2016 Location: Trenton,Ontario & South Carolina Posts: 755	Re: 350 with a draft tube??? That would explain the hose coming from the top of the block at the back.I can't exactly remember but I think the hose would go to the air cleaner,early form of PCV, had that on my 1967 Beaumont with 283



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