Topic: 66 Hertz Radiator

[ChrisV289]

What should the engineering numbers be on the top of the tank of. A 66 Hertz car, automatic transmission? Also the approx date code as well on a car shipped to hertz around mid March. The top of the tank my dad currently has only the W MO but a date code of 4 66. No other numbers stamped.

[jwc66k]

That's it, same as my Oct 65 San Jose build 66 GT K Fastback with a C4, "W-MO" and dated "9 65". On mine the stamping reads upside down from the front.
Jim

[ChrisV289]

So the engineering numbers found on 65 Mustangs was phased out?

[Bob Gaines]

So the engineering numbers found on 65 Mustangs was phased out?

Phased out in late 65 and on the W-MO radiators a soldered on tag with the engineering number . Dearborn and Metuchen had them metal stamped on the side straps.

[Bob Gaines]

What should the engineering numbers be on the top of the tank of. A 66 Hertz car, automatic transmission? Also the approx date code as well on a car shipped to hertz around mid March. The top of the tank my dad currently has only the W MO but a date code of 4 66. No other numbers stamped.

The soldered on tag would read C4ZE-8005-M2 . You can get one from AMK and solder it on if missing.

[J_Speegle]

Phased out in late 65 and on the W-MO radiators a soldered on tag with the engineering number . ..........

+1

Here is a couple of  examples from the second half 66 San Jose radiator to illustrate

[ChrisV289]

Thanks Jeff, based on the VIN I gave you on his car, is the 12-65 the best date code to get or is there another in-between?

[J_Speegle]

Thanks Jeff, based on the VIN I gave you on his car, is the 12-65 the best date code to get or is there another in-between?

Since you have an automatic its going to make it allot easier (in comparison to manuals) so I would look for a 1-66 or even 2-66. Your VIN is right near the end of a group of a half dozen 1-66 radiator cars and before and just after a couple of 2-66 cars. Change is likely due to the fact that the cars were not (at San Jose either) order

Believe 12-65 would be too early for yours

Thanks for sharing the partial VIN - makes these answers a whole lot easier to estimate