Daytona comp carb accelerator pump diaphragms?

Call Pierce Manifolds in CA. Just give them the carb model number. It takes about 5 minutes each to change them. Super easy project.

 

The model number is on the rear of the base of the carburetor. The only one you can see easily is the rear carb. Probably 40 DCN 20 or 21.

 

For info see here.

 

DCN 20 Webers were not just used on Comp Daytonas. DCN 21 Webers were also used on Comp Daytonas so neither is Comp specific.

 

The only differences between the 20 and 21 are:
Idle Jet from 55 to 60 (richer)
Float Height from 48mm to 51.5 mm (brings the mains in a little later)
They added some additional fuel as the engine goes through the transition range and compensated by bringing the mains in a little later. Should make the car drive better under moderate acceleration.

Yes, you can fairly easily modify 21A (US emission version) to get very close to a European version (20/21). I have done it and it does help the cars drive better. You also should modify the ignition system to Euro specs at the same time to get the best results.

40 DCN's on Comp Daytona's have very different chokes and jetting (the factory just rejetted and modified stock carbs).

 

Dyke can detail procedure to convert USA ignition to Euro specs?

 

Having done some of these ^^, I agree.