It's no surprise to folks here that I'm confused. Please bear with.
First pic is my intake manifold and its plastic spacer with 2 holes in it. This is after I removed the Rochester Monojet from it. Does a Carter YF 2100S go right on top of the same plastic spacer?
The 2nd pic shows 2 gaskets. The one on the left goes under the plastic spacer, right? Is the one on the right appropriate on top of the spacer for both the Monojet and YF?
The 3rd pic compares the Monojet and YF bases. How can a YF carb so simple in the number of holes on its base (2) be simply swapped for the MJ with its 6 holes?
34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
There was no gasket ever called for under the insulator. You can put one there if you want to.
The simplest answer as to which gasket to use under the carburetor, is to use the ones which has slots which line up with the holes in the carburetor and the insulator. If neither of your gaskets have slots which line up, you can carve a new slot with an exacto knife.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
Carter Carburetor went out of business a long time ago. The new parts available to us today may be designed in a way that they can also be used on other models. Originally there was the Carter 1A-31 and 1A-41 flange gaskets used on a Carter YF, without a governor. The difference is the bore diameter and the c-to-c mounting stud distance (in a nutshell, the smaller 216 or the larger 235/261).
When changing carburetors, ALWAYS use the carburetor manufacturer's recommendation for the gasket directly under the carburetor!
Jon.
Good carburetion is fuelish hot air The most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes! The Carburetor Shop
