Quote:
Originally Posted by carbking
Very interesting thread. Really wish you had the build sheet, which is going to be the definitive document for this case.
Just for grins, checked the following:
Pontiac power train charts for 1971 show the 263 carb for manual transmission 400's and 455's other than the H.O. which got the 267 and the Ram Air which got the 273.
Rochester Master Products book concurs with the above.
Pontiac service bulletins from 1971 through 1976 do not show any change from a 263 to a 264 for 1971.
Would GUESS this was an error at the factory.
Pontiac would have been subject to a massive fine for arbitrarily changing emission certification standards.
The cars with the single booster AND manual transmissions WOULD idle. It was the cars with auto transmissions that had idle issues with single booster carbs.
Going forward (opinion):
The 7041263 in stock calibration will deliver SLIGHTLY better (5 percent???) fuel economy around town.
If the car is showed at a points judging show, the car will lose points with the wrong carb UNLESS you can find the build sheet. Being the original owner will not help.
Jon
|
Thank you VERY much for speaking up Jon!
__________________
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)
|