See attached
 

Price and facts book 3rd edition, Re; Tach and Trans info
Power Team Chart:

Seems to be a lot of "ideas" bouncing around here on the options...re tach and the tranny.

Tach was available as an "option", could be ordered, did not have to come ONLY with the BB engine, it could be ordered with a 327 too. But finding a car with a in dash tach would be 90% chance it was a BB. So to find a BB car without a factory tach would make me wonder. The tachs work very well, as well as any aftermarket available at the time. But they were hard to see in the right side pod in the dash, hence the tachs on the steering column were prevalent for serious drag cars.

Almost ALL cars that were ordered with a four speed got the M21, (95%+) very few came with a M20.

Also a very high percentage came with the 12 bolt rear end, very hard to find a 10 bolt rear end for parts. Even 6 cylinder cars came with the 12 bolt.

so, if my car has a date proper 4:88 12 bolt and an M21, with the 2Q on the tag and the proper v8 vin, what's the chances it isn't an original 427 L72 car?

What about 4-Spds????!!!!
 

All we are talking about here is a 1966 Full Size car.
95% of all cars ordered with a 4-spd got an M21???

For the 1966 Full Size Car, 30,467 Cars came with an M20 and 1,595 Came with an M21

thanks Paul.
any insight on my question?
i'm trying to verify my full size biscayne, of which i understand they only made 189 in 1966, if i am correct
definitely a date correct M21 and 4:88 12 bolt

L72
 

This is all I can say based on the following. If the trim tag is original, we know that a Group 2 code Q means the car came with an M21. We also know based on the previous posts that the only engine for the 66 Full Size Car including an M21 was the L72. If in fact the Trans is original to the car that further substantiates the L72 once again. I would be curious if the Tach harness was up under the dash as the car would have had to have a tach.
Records show a combination of model 15411 and 15611 total of 225 L72's between the 2 DR Biscayne and 2 Dr Belair.
Paul

Have to remember, this car is 59+ years old and a lot can happen in the interim. Factory tach could easily have become inoperative over the years and, rather than spend money trying to replace or repair it, a clock (which was far more prevalent than a tach) could have been put in its place.

Paul, that's a great suggestion, to look under the dash for the factory tach wiring.

You should closely inspect the rear upper crossmember. These cars are well known for ripping it away from the frame rails if slicks are added. Past (or current) damage might be indicative of a racing past. BTW, those front bumper guards are kinda strange to see on such a no frills, bare-knuckle fighter.

Not sure if my reply from early today went through. It's definitely an L72 car since it shows 2Q on the cowl tag. 2Q is close ratio 4spd and was only available with the L72 in 66 so all 2Q cars in 66 are L72's. See if you can find the partial vin on the front, opposite side of the transmission case from the P0630 date code. is there a metal part number tag still attached to one of the side cover bolts?

You could get a 327 with a m20 OR an M21. 2Q does not make it a BB car