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That's the location for devices that control throttle position. Which device belongs there changes depending on the year model and the options on your car.
For example, if you car has cruise control, the throttle actuator goes there.
Paul, being concerned with originality, look into why your engine has the wrong oil filler cap for 1970. It should be the AC FC-60. (I grabbed this image which shows the correct look but that chrome finish and rivet indent style were not used on OEM caps.)
Also check your engine's VIN derivative code because a serif "F" indicator does not rule out the block being made later than the 1970 model year.
Last edited by VC455; Mar 6, 2026 at 10:23 AM.
Reason: clarified cap details
As far as the dashpot itself....there are various versions out there in the aftermarket parts business....none are EXACTLY correct to original (I believe) but may suffice. You'll have to do a search. Or you may be able to find good used originals or NOS (big $).
Thanks to all.
The block is original and numbers match. This is a Z code assembled in Fremont. Seems like every other 70 is an M. Has the odd scattered out VIN plate
Paul, being concerned with originality, look into why your engine has the wrong oil filler cap for 1970. It should be the AC FC-60. (I grabbed this image which shows the correct look but that chrome finish and rivet indent style were not used on OEM caps.)
Is that a 442 and/or 455 thing? My 1970 350 has the style cap in the OP's picture.
As explained (by Joe) in the link I posted (above) ^^
That particular dashpot isn't actively controlled. It's just a spring-loaded plunger with a diaphragm. It has no idea if the A/C is on or off. All it knows is that when the throttle arm on the carb hits it, the spring compresses, the plunger moves, and the diaphragm slows that process.
