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#1
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‘73 Quadrajet on a ‘76 intake-no go!?
I have a 525355 intake on my ‘63 LeMans, which I show as being a ‘76. I had a ‘76 Quadrajet on the car when I bought it, but it has damage to the casting, and after many tear downs and playing with it, determined it’s junk. Cliff couldn’t figure out anything either from a couple states away through emails and pictures. I was using his parts to rebuild it.
So I bought a’73 17054913 off another member here, that Cliff had rebuilt years back, so I know I won’t have another junk parts carb. I just put it on, and it appears the choke linkage is hitting the intake on the passenger side. Aren’t pretty much all Pontiac Quadrajets bolt on’s with Pontiac intakes? I know there are different choke set ups, but never knew it would interfere with actual throttle opening?
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
#2
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What intake manifold was the member you got it from running it on?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#3
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I’ll have to email and ask I guess. I just know he said his Pontiac 440 build
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
#4
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Here
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
#5
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Had the exact same thing happen when i tried to run a ‘74 Quadrajet on a ‘76 intake, no go. Swapped to a ‘74 intake to solve the issue.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
#6
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Geez. Been driving Pontiacs since my first car in ‘82, and I never knew this was an issue. I guess I learn something new everyday. I’m kind of tired I’d screwing around with this car though. I wanna get to driving, not wrenching. On to find an intake I guess….
Thanks guys for the info.
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
#7
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Quadrajet seller said he ran a Northwind intake with this carb BTW.
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
#8
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Electric choke might be solution so Intake change not necessary.
Sent from my Moto Z3 Play using Tapatalk
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You never know what I might have that you are looking for. EMAIL me. Also check out my other ads here on PY. Just click on user name to view other ads. USPS Money Orders or Wal-Mart to Wal-Mart money gram wire transfer -preferred payments. If Payment doesn't show up in 3-4 days, I move on to the next person that wants it. Serious Inquiries Only - Shipping Isn't Free. |
#9
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I guess it’s not really the linkage as much as the fast idle screw and what appears to be maybe a rear choke pull off attaching point. My carb has an electric choke already. Another pic, sorry they’re fuzzy
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
#10
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Can you grind on the intake to make it work?
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#11
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I don’t think you could grind enough to make it work, the interference was substantial from what I remember.
I had just bead-blasted and painted my ‘76 intake and then had to do it all over again with a ‘74 intake to run the ‘74 carb I had. One of those things you learn messing around with old cars, you don’t find out what interchanges and what won’t until you try doing it.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
The Following User Says Thank You to b-man For This Useful Post: | ||
#12
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Yes, I’d have to grind 1/4-1/2” off the outside of the area where the carb mounts, in quite a big arc.
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
#13
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So next question- If I find a ‘73 intake, any surprises mounting the intake to a ‘69 400 with 46 heads? I don’t want this to snowball. I remember heat crossover not lining up, or had to use different intake or head gaskets on some years,but this was WAY back, so I might be remembering incorrectly.
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
#14
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Well if you already had a ‘76 intake on that ‘69 engine you already knew how to deal with the exhaust crossover mismatch.
If you don’t already have the matching bathtub style valley pan that clears the huge EGR passages cast into the bottom of the ‘73 intake then you need one. This is one instance where one of the regular Edelbrock Performer intakes would come in handy, as long as you don’t mind dealing with all the fuel line/linkage/choke/PCV hookup issues like most any other aftermarket intake presents you with. It fits both early and late crossover designs, any type of valley pan and any square bore or spread bore carb as well. If you’re trying to source a ‘73 -‘74 factory intake you’d better find something local to avoid the incredibly expensive shipping, those things weigh a ton.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
The Following User Says Thank You to b-man For This Useful Post: | ||
#15
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I would use a Fel-Pro 60334 1/4" flange gasket and install an electric choke element to make the -73 carb work on a -76 intake.
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#16
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Quote:
So since there is a ‘76 intake on it already, would a ‘73 intake work with the valley pan? Thanks!
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
#17
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Quote:
Thanks!
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
#18
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those tubes (unless rusted) are sealed, and would post no vacuum leak if unused - so if you decide to go with an electric choke, you can just pull the tubes and put them aside.
If you want to hook it up, I believe that you can change the "pot" that the bimetal coil sits inside of - the hookup for the tube is on the opposite side between the two carburetors; front on one, rear on the other. iirc both setups require the other tube be connected to a line at the rear of the carb.
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
#19
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Quote:
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
#20
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If you have the hood clearance, a 1/2" spacer will probably get everything to clear. Of course, then you'll need longer studs and hold-down bolts.
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Triple Black 1971 GTO |
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