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#1
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My new 7040263 Q-jet
Yesterday I got my new carb. It looks good. It's going to replace my current carb which is a likely fake 7040273 Frankenstein carb. I can't wait to get it on the car.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Ray Klemm calibrated Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#2
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Very nice! What date is on it?
Dennis |
#3
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Ray Klemm calibrated Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#4
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Ray Klemm calibrated Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#5
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Jhein, Thanks! Have you checked out what it has for jets & metering rods yet? My 7040270 (auto carb) had it's original 69 jet/37 rod primaries and DA (.044 M) and 'N' hanger on the secondary side. With today's fuels, it seems a tad lean, so will jet up a little bit after some more shake-out driving.
Dennis |
The Following 2 Users Say Thank You to SD455DJ For This Useful Post: | ||
#6
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Just for S&G, 273 is a RA carb, 263 is a 350hp, both with manual transmissions
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#7
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Yeah, I know. But since there aren't many of those around, I guess I'd rather have a real 263 than an obvious fake 273.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Ray Klemm calibrated Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#8
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Bigger jet and smaller rod is richer.
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#9
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incase this helps - taken from my 1970 Rochester book (secondary hanger part number translated thanks to Cliff's book):
jets / primary rods / secondary rod 7040270 = 70 / 37 / CC 7040273 = 70 / 37 / CC 7040263 = 70 / 41 / CC I believe that the '263 was a smidge leaner on the primary side because of the POE (used on all non-RA Pontiac airhorns that year) which would introduce a smidge more fuel on light or part throttle. Also incase it's helpful; 7028270 = 72 / 41 / BE 7028273 = 72 / 42 / BE 7029270 = 69 / 38 / BP 7029273 = 69 / 36 / BP
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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) |
#10
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Quote:
Dennis |
#11
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Quote:
Also, so then I can change my primary rods and get closer to the RA calibration?
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Ray Klemm calibrated Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#12
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Quote:
I'll see If I can be of help.
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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) |
The Following User Says Thank You to unruhjonny For This Useful Post: | ||
#13
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I recall using 70 primaries in just abut everything. 37 rod will cruise richer than a 41. Was just looking for my main Rochester book, black binder withChev/Pont label. Know where within about 300 sq. ft....
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#14
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Why would they cad and not do the rite green.
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#15
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@ padgett - well, now you don't need to look
@ Dennis - I would wager the metering was adjusted at some point; These carbs were setup as per application; I have heard that when these cars were new, it was common for dealerships to perform metering changes to remedy customer complaints ect - and while I don't know if there was a TSB which suggested a metering change, but that's another possibility. I so would have loved to be around when these cars were new... I'd would have probably always been broke too
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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) |
#16
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I was around when these were new and was always broke. But was a GMI student on the GI Bill, and had access to Many Things.
(Like an unchromed Buick bumper, Flint glommed onto some of my ideas). ps in front was my SCCA B/P Z06 FI split window. |
#17
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LOL - thanks for that
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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) |
#18
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Quote:
No vacuum port for the automatic kickdown. (no throttle kickdown on automatic linkage)
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#19
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BTW, Padgett used to have some good Qjet info on the web.
(not sure if it's still up)
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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