71 vs 72 thermoquad
Just to 'clarify' a few facts on the subject. The differences are:
The '71 340 carb was 'based' on the Competition Series 850 cfm T.Q. and
as stated above, the '71 T.Q. was:
a)air metered..................'72 model was fuel metered;
b)both the '71 340 and the '72 340 carb was rated @800 cfm's;
c)'71 jets, bowl, base and top are NOT interchangeable with the '72 carb/parts;
d)'71 340 had the idle mix screws 'angled' away from the centerline of the carb while the '72-'84 oem carbs had the idle mix screws 'angling' upward;
e)the '71 340 carb had the front vent stack as an integral part of the top casting while the '72 carb had a push-in cylindrical steel vent stack;
These are the most noticeable side-by-side differences between the two carbs. An the '71 carbs are worth more $$$ because of the 'rarity' of the '71 model.
The '72 is the better performer of the two because it has more sophisticated metering systems. The '71 carb is easier to pull trash into the metering system while the '72 has the cronic problem of leaky main jet wells on the underside of the bowl.
In my opinion, the '72 340 carb is the best performing 800 cfm T.Q., David
'71 340 T.Q. pic:
Just to 'clarify' a few facts on the subject. The differences are:
The '71 340 carb was 'based' on the Competition Series 850 cfm T.Q. and
as stated above, the '71 T.Q. was:
a)air metered..................'72 model was fuel metered;
b)both the '71 340 and the '72 340 carb was rated @800 cfm's;
c)'71 jets, bowl, base and top are NOT interchangeable with the '72 carb/parts;
d)'71 340 had the idle mix screws 'angled' away from the centerline of the carb while the '72-'84 oem carbs had the idle mix screws 'angling' upward;
e)the '71 340 carb had the front vent stack as an integral part of the top casting while the '72 carb had a push-in cylindrical steel vent stack;
These are the most noticeable side-by-side differences between the two carbs. An the '71 carbs are worth more $$$ because of the 'rarity' of the '71 model.
The '72 is the better performer of the two because it has more sophisticated metering systems. The '71 carb is easier to pull trash into the metering system while the '72 has the cronic problem of leaky main jet wells on the underside of the bowl.
In my opinion, the '72 340 carb is the best performing 800 cfm T.Q., David
'71 340 T.Q. pic:
