Year and Application(1) Carb #          Main Jet(2)     Primary Rod(3)  Secondary Rod(4)

1966-
400/425 M.T.            7026250         7031971         7031844- "44"   7033655- "AU"
330 M.T.                7026254         7031971         7031844- "44"   7033658- "AT"
400 A.T. w/o A.I.R.     7026256         7031971         7031844- "44"   7033655- "AU"
330 A.T. w/o A.I.R.     7026255         7031971         7031844- "44"   7033658- "AT"

1967-
330                     7027036         7031971         7031844- "44"   7033658- "AT"
330 w/ C.C.C.           7027135         7031971         7031845- "45"   7033658- "AT"
330 w/ A.I.R.           7027153         7031971         7031845- "45"   7033658- "AT"
400/425 w/o A.I.R.      7027156         7031971         7031844- "44"   7033655- "AU"
400/425 w/ A.I.R.       7027157         7031971         7031845- "45"   7033655- "AU"
400/425 w/ C.C.C.       7027032         7031971         7031845- "45"   7033655- "AU"
400 M.T. w/O.A.I. (5)   7027156         7031971         7031841- "41"   7033655- "AU"
425 Toro w/o A.I.R.     7027131         7031971         7031844- "44"   7033655- "AU"
425 Toro w/ A.I.R.      7027130         7031971         7031845- "45"   7033655- "AU"
425 Toro w/ C.C.C.      7027132         7031971         7031845- "45"   7033655- "AU"

1968-
350                     7028250         7031971         7034849- "49B"  7033658- "AT"
350 w/ W-31             7028255         7031974         7034849- "49B"  7033658- "AT"
400/455                 7028251         7031971         7034849- "49B"  7033655- "AU"
455 Toro                7028252         7031971         7034849- "49B"  7033655- "AU"
400 W-30                7028254         7031975         7034849- "49B"  7033655- "AU"
400 "442"               7028253         7031972         7034849- "49B"  7033655- "AU"

1969-
350                     7029250         7031970         7034849- "49B"  7033658- "AT"
400/455                 7029251         7031970         7034849- "49B"  7033655- "AU"
455 Toro                7029252         7031970         7034849- "49B"  7033655- "AU"
400 M.T.                7029253         7031972         7034849- "49B"  7033655- "AU"
400 W-30                7029254         7031975         7034849- "49B"  7033655- "AU"
350 W-31                7029255         7031974         7034849- "49B"  7033655- "AU"

1970-
350                     7040250         7031970         7040701- "52C"  7033658- "AT"
455                     7040251         7031970         7034849- "49B"  7033655- "AU"
455 Toro                7040252         7031970         7040701- "52C"  7033655- "AU"
350 W-31 (6)            7040255         7002657            -            7033655- "AU"
455 "442"               7040253         7031969         7040699- "48C"  7033655- "AU"
455 W-30 M.T. (6)       7040256         7002658            -            7033655- "AU"
455 W-30 A.T.           7040258         7031969         7040701- "52C"  7033655- "AU"
455 W-33                7040257         7031969         7040701- "52C"  7033655- "AU"

1971-
350                     7041250         7031970         7034849- "49B"  7038256- "AS"
455                     7041251         7031970         7034849- "49B"  7033104- "AK"
455 Toro                7041252         7031970         7034851- "51B"  7033549- "AX"
455 M.T.                7041253         7031969         7034849- "49B"  7033655- "AU"
455 A.T.                7041257         7031969         7034849- "49B"  7033658- "AT"

1972-
350                     7042250         7031969         7034850- "50B"  7045778- "CG"
455                     7042251         7031969         7034850- "50B"  7045779- "CH"
455 Toro                7042252         7031969         7034850- "50B"  7045779- "CH"
455 "442"               7042253         7031969         7034847- "47B"  7045779- "CH"


Notes:

(1) Except for the applications otherwise noted, the carb listed was used in
all applications of that motor. The usual exceptions are the specific
engines used in the 442 and Toronado models.

The following abbreviations are used:
        A.I.R.= Air Injection Reactor
        C.C.C.= Climatic Combustion Control
        O.A.I.= Outside Air Induction
        M.T.= Manual Transmission
        A.T.= Automatic Transmission
        Toro= Toronado
        W-30= High-performance big-block engine
        W-31= High-performance small-block engine

(2) The last two digits of the part number designate the size of the jet
orifice in thousands of an inch; thus, a jet with the part # of 7031971, has
an orifice of .071", and is stamped with a "71".

(3) The last two digits of the part number *usually* designate the size of
the largest portion of the tapered shank of the rod in thousands of an inch;
Thus a primary rod with the part # of 7031844 has a taper of .044" at its
largest point. This two-digit number is also stamped on the rod. After 1968,
the metering rods had a double or triple taper, and had a "B" or a "C"
suffix stamped on the rod, respectively. These triple-taper rods, however,
do not have a part # corresponding to the size of the taper, although the
stamped number on the rod does correspond to its diameter.

(4) The secondary metering rods are stamped with a two-letter code. A guide
to the comparative dimensions of these rods can be found on pp. 152-153 of
Doug Roe's "Rochester Carburetors".

(5) The O.A.I. carburetor had the same part # as the standard manual
transmission 442 engine carburetor, but had different primary metering rods.

(6) Note that the W-31 and W-30 carburetors apparently used 2-bbl jets with
NO primary metering rod, and thus no power piston. If any owner of one of
these carburetors could confirm this, I would appreciate it (I thought it
was a typo at first, but it is specifically listed this way for both W-31
and W-30 applications.
______