quad. 4 barrel off of a bb truck f/s

[billsbowtie]

this was running on the truck when it was took off . i don't know when that was. they replaced it with a edelbrock . it seem to be in good tight shape. $100.00 picked up or $110.00 shipped.

[billsbowtie]

here are some #'s that was on the back of it 7047687.

[1970cstblazer]

What are the numbers on the drivers side of the carb by the secondary throttle shaft. They are vertical.

[billsbowtie]

if you don't here back from me by mon. remind me.

[billsbowtie]

is this the # you need 7045213 and down under it it says m5 ya

[woodridge]

Here is a breakdown on the codes:

70YYEDT or 170YYEDT

70: Rochester carbs started with either 70 (before 1976) or 170 (after 1976).

YY: The year code. The years are a little convoluted, but probably the easiest part to remember.

1965 25
1966 26 (or 36 on A.I.R. engines)
1967 27 (or 37 on A.I.R. engines)
1968 28 (or 38 on A.I.R. engines)
1969 29 (or 39 on A.I.R. engines)
1970 40
1971 41
1972 42
1973 43
1974 44
1975 45
1976 56 (the year they started the 170 prefix)
1977 57
1978 58
1979 59
1980 80
1981 81
1982 82
1983 83
1984 84
1985 85
1986 86
1987 87
1988 88

The code for 1965 would be either 25 or 35, 66 would be 26 or 36, 67 would be either 27 or 37, etc. 1970 is 40, 72 is 42, 75 is 45. You get the idea. The 80s are easier because they're usually straightforward. 81 is 1981, 84 is 1984.

E: The emissions code. 2 is for 49-state emissions, 5 is for California & high altitude.

D: Division. 0, 1 and 2 are Chevy, 3 is Cadillac, 4 is Buick, 5 is Oldsmobile, 6 and 7 are Pontiac. Rochester doesn't always follow this rule.

T: Transmission. Even numbers are automatic trans, odd numbers are manual trans. Rochester also doesn't always follow this rule.

This guide is just that: a guide. It is not set in stone, because it is a documented fact that Rochester didn't follow these rules 100%. It is for Quadra-jet carburetors only. Rochester also had different numbering systems for their other carbs besides the Quadra-jet. Our thousands of pages of information on this comes straight from Rochester.

Keep in mind that just because the OEM numbers between two carbs may be different, it doesn't mean they are different carbs. It's very possible to have two carbs, their date is 2 years apart, one is for Buick and one is for Chevy Truck, and one is for automatic, the other for stick, and the carbs are identical in every single way, even down to the jets and metering rods. It's much more common than you might think. Also, many people think they have to have a carburetor with a certain exact OEM number. This can sometimes be very very hard. Most people don't have to have this, they really only need a carburetor that crosses over the same and is identical. You realistically only need an exact OEM number if you are restoring a car back to original condition to enter into a car show.

[1970cstblazer]

The carb is calibrated for a 1975 3/4 ton Chevrolet Pickup truck with a 350 cubic inch engine and an Auto trans. I am looking for a true 1972 big block carb.

[billsbowtie]

ok anyone interested in this one for $60.00 shipped.