B61 or b75

[Bluebulldog]

The b61 grill was always steel with vertical shutters?  One for sale locally that he claims is a 61 that has the square aluminum grill with horizontal shutters.  I thought that it was a b75 myself am I wrong?

[AZB755V8]

The large aluminum horizontal shuttered grill/radiator was available on both B-6XX series and B-7XX series. It was for added cooling for larger horsepower engines. I have see the smaller vertical shutters and grill on B-7XX series trucks as well. The easy way to tell the difference between a B-6XX and B-7XX is the fender extensions (behind the fender) and longer hood. Also the cab floor will have a drop pan in the B-7XX series. 

[Maddog13407]

add to the confusion,,,in Canada Horizontal shutters were an option on any B model I have heard... to keep the snow from plugging them up. have even seen a few examples

[harrybarbon]

2 pictures of a 56 B75 with the same cowl and vertical shutters as the B43 and B61.

When was this alloy radiator with horizontal shutters, that is on the B73 and B75 series, (and B615) introduced by Mack?

It was before the B615 which were available approx 1962 and ended 1964 or 65 - B615 was a short production period. If the yellow Mack B75 is a a guide, then alloy radiator was maybe after 1956!!!

[j hancock]

43 minutes ago, harrybarbon said:

When was this alloy radiator with horizontal shutters, that is on the B73 and B75 series, (and B615) introduced by Mack?

I think the earliest one I have seen is a 1956 model.

[harrybarbon]

Here are some parked Mason Dixon B models - I recall reading somewhere that because Mason Dixon had big orders, Mack built custom B models to Mason's specifications - these seem to be similar to the B67 models, short hoods however with the alloy radiator and the straight rear cab wall - whereas I read that usually the B67 had the concave cab and the steel radiator cowl with vertical shutters. And from the pictures it is hard to see what motors were in Mason's B models, possibly not the V8 - 864's, so likely a 6 cyl Mack motor that sat back into the cabin.

I remember seeing a B 67 here in Aust with the concave cab and vertical shutters. I recall the passenger seat was factory cut out like a quarter circle, for the two gear sticks because the engine was set back into the cab, so the gear sticks were further back and so the seat was modified for the gear sticks - the driver of this B67 complained of the tight space, as he changed gears his elbow hit the rear banana cab wall. And somehow this driver, about 6 feet, actually managed to curl up and sleep in the cab.

And the green B model could be a Mason Dixon unit, red paint under the green and same square fuel tanks and red frame

[HeavyGunner]

Wow that picture of the b’s lined up is very cool. 

[carlotpilot]

5 hours ago, harrybarbon said:

Here are some parked Mason Dixon B models - I recall reading somewhere that because Mason Dixon had big orders, Mack built custom B models to Mason's specifications - these seem to be similar to the B67 models, short hoods however with the alloy radiator and the straight rear cab wall - whereas I read that usually the B67 had the concave cab and the steel radiator cowl with vertical shutters. And from the pictures it is hard to see what motors were in Mason's B models, possibly not the V8 - 864's, so likely a 6 cyl Mack motor that sat back into the cabin.

I remember seeing a B 67 here in Aust with the concave cab and vertical shutters. I recall the passenger seat was factory cut out like a quarter circle, for the two gear sticks because the engine was set back into the cab, so the gear sticks were further back and so the seat was modified for the gear sticks - the driver of this B67 complained of the tight space, as he changed gears his elbow hit the rear banana cab wall. And somehow this driver, about 6 feet, actually managed to curl up and sleep in the cab.

And the green B model could be a Mason Dixon unit, red paint under the green and same square fuel tanks and red frame

l have serious doubts that these trucks still exist . this has to be an old photo

[41chevy]

Late 1955 dealer spec sheet for 1956 and up.

 

 

[Vladislav]

56 minutes ago, 41chevy said:

Late 1955 dealer spec sheet for 1956 and up.

 

 

This is an option with a kind of hard nose, like B-81 or 87, not the big aluminium radiator.

[Vladislav]

6 hours ago, harrybarbon said:

Here are some parked Mason Dixon B models - I recall reading somewhere that because Mason Dixon had big orders, Mack built custom B models to Mason's specifications - these seem to be similar to the B67 models, short hoods however with the alloy radiator and the straight rear cab wall - whereas I read that usually the B67 had the concave cab and the steel radiator cowl with vertical shutters. And from the pictures it is hard to see what motors were in Mason's B models, possibly not the V8 - 864's, so likely a 6 cyl Mack motor that sat back into the cabin.

I remember seeing a B 67 here in Aust with the concave cab and vertical shutters. I recall the passenger seat was factory cut out like a quarter circle, for the two gear sticks because the engine was set back into the cab, so the gear sticks were further back and so the seat was modified for the gear sticks - the driver of this B67 complained of the tight space, as he changed gears his elbow hit the rear banana cab wall. And somehow this driver, about 6 feet, actually managed to curl up and sleep in the cab.

And the green B model could be a Mason Dixon unit, red paint under the green and same square fuel tanks and red frame

That's a pretty interesting fact. Thanks for sharing on here.

[Hobert62]

Service lines inc where my b67 came from had some big radiator b67s as well. I will agree about hitting elbow sometimes on a shift too.   

[Maddog13407]

pretty sure most of Masons B67's had the big square tanks not seen on any other B models, the big radiator and 673 turbos with old school R96 Roadrangers. Schwerman tank lines also ran R96 roadrangers in the B models.

[41chevy]

And most of the heavy rads were painted aluminum from Mack on the 613 and the 615 wide hoods.

PHOTO CREDIT BRAD DUNKIN

 

[Travis McDowell]

Anyone who has a grill for a b61 you can call 270 847 751@