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04-11-2013, 09:53 PM
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#1 |
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Senior Member
 
Join Date: Dec 2011
Location: Laurel, Mt.
Posts: 522
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71 vs 72 intake differences
I was out in the garage getting the intake for my 72 ready for a cleaning and noticed two threaded holes on the pass. side that I don't have on either of my 71's. Anyone know what they're for? The first pic is the 71, second is the 72.
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1972 Cheyenne Super 10 SWB,bucket seats,dealer cruise,tilt,tac,a/c,shoulder belts, 350/350 1971 K-10 Custom Deluxe 1971 K-10 Custom |
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04-11-2013, 09:55 PM
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#2 |
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Senior Member
Join Date: Dec 2011
Location: Laurel, Mt.
Posts: 522
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Re: 71 vs 72 intake differences
Here's the second pic of the 72
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1972 Cheyenne Super 10 SWB,bucket seats,dealer cruise,tilt,tac,a/c,shoulder belts, 350/350 1971 K-10 Custom Deluxe 1971 K-10 Custom |
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04-11-2013, 09:57 PM
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#3 |
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Senior Member
Join Date: Dec 2011
Location: Laurel, Mt.
Posts: 522
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Re: 71 vs 72 intake differences
I just realized I put pass. side I meant drivers side, oops...
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1972 Cheyenne Super 10 SWB,bucket seats,dealer cruise,tilt,tac,a/c,shoulder belts, 350/350 1971 K-10 Custom Deluxe 1971 K-10 Custom |
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04-12-2013, 08:31 AM
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#4 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: 71 vs 72 intake differences
The holes on the manifold are for mounting an AC compressor. Cars had these holes starting in 69 I believe as my 69 El Camino has the compressor mounted on the driver's side using those holes. The engine in my El Camino is numbers matching with original AC so I am sure that the holes were there on that year.
Truck AC's were moved to the driver's side in 1973 so if your manifold numbers are for a 72 truck then it is probably a late 72. Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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04-12-2013, 09:15 AM
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#5 |
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Senior Member
Join Date: Dec 2011
Location: Laurel, Mt.
Posts: 522
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Re: 71 vs 72 intake differences
Thanks Jim, that's interesting. The only other thing I found about my 72 intake was that it shares the same casting number as the base corvettes which I believe mounted their compressors on the pass. side like our trucks and from what I've seen its a 72 year only casting number.
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1972 Cheyenne Super 10 SWB,bucket seats,dealer cruise,tilt,tac,a/c,shoulder belts, 350/350 1971 K-10 Custom Deluxe 1971 K-10 Custom |
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04-12-2013, 09:55 AM
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#6 |
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Registered User
Join Date: May 2007
Location: Rapid City South Dakota
Posts: 2,359
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Re: 71 vs 72 intake differences
In 72, trucks and corvettes, still used short water pumps, and had a/c compressors mounted on the pass. side. Unlike everything else that went to long pumps in 69. But yes, those are a/c bracket holes.
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Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299 |
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