Factory jets and rods

[Ethan1]

So there was no 7040270 carb in 1970 ?

 What model Pontiac are we talking about here? I am assuming the GTO?

[Ethan1]

So there was no 7040270 carb in 1970 ?

 You would be correct. I went right past it. The 7040270 is the correct Qjet for the Ram Air IV.

 .070" Primary Jets, 39 Primary Metering Rods, "K" Secondary Hanger and CC Secondary Metering Rods.

[MG60]

Yes Ethan1 your right , the 7040268 was for the 455H.O. and the 7040270 was for the 400RA IV .     Could you take a look at the front cover of Cliff's book and tell me what you think the carb is ?  I think it's of a Buick GSX 455 Stage 1 . What numbers were used on those carbs and what were the internal specs ? How much different were they from the standard Buick 455 carb (auto) ?  Was the Stage 1 option only available for 1970 , 1971 & 1972  ?

[Ethan1]

Yes Ethan1 your right , the 7040268 was for the 455H.O. and the 7040270 was for the 400RA IV .     Could you take a look at the front cover of Cliff's book and tell me what you think the carb is ?  I think it's of a Buick GSX 455 Stage 1 . What numbers were used on those carbs and what were the internal specs ? How much different were they from the standard Buick 455 carb (auto) ?  Was the Stage 1 option only available for 1970 , 1971 & 1972  ?

 Not sure on the front cover Qjet. Cliff would be best to answer.

 The option for the Stage 1 went from 1969-74.

 Which year are you interested in?

[MG60]

1971 and 1972 .

[Ethan1]

1971 and 1972 .

 1971 was the 7041242: .075" Primary Jets, 45B Secondary Metering Rods, "K" Secondary Hanger and AV Secondary Metering Rods.

 1972 was the 7042242: .075" Primary Jets, 47B Secondary Metering Rods, "K" Secondary Hanger and CV Secondary Metering Rods.
 

[MG60]

Sorry Ethan1 , I forgot to ask for 1970 as well .

[Ethan1]

Sorry Ethan1 , I forgot to ask for 1970 as well .

 1970 was the 7040246: .068" Primary Jets, 42B Primary Metering Rods, "K" Secondary Hanger and AU Secondary Metering Rods.

[MG60]

Does anybody know what the carb is on the front cover of Cliff's book ?

[MG60]

It took a lot of research but I got it .  The carb in the picture on the front cover of Cliff"s book is a model 7029273 .
1969 Ram Air IV 400 "Judge" for manual transmission .