Early 40 IDFs

Dave · Posted: Wed Jun 23, 2021 10:07 am Post subject: Early 40 IDFs

Got a set of 40 IDFs yesterday, and it took me a long time to find out what size they are, they don't have it stamped on the base flange like I am used to, they are stamped under the fuel inlet plug, right above the accelerator pump... as well, and the accelerator p[ump is activated by a cam and roller like the IDAs have....anyone tell me more about them?
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Ohio Tom · Posted: Wed Jun 23, 2021 12:20 pm Post subject: Re: Early 40 IDFs

Early Italian made IDF's.
The also probably have pressed in fuel inlet fittings?

Dan Ruddock · Posted: Wed Jun 23, 2021 12:35 pm Post subject: Re: Early 40 IDFs

Idf-18 and idf-19, if they have the same number, no big deal just means fuel nipples are reversed. When in good shape are IMO better than Spanish webers. Quality control was better back then.

jpaull · Posted: Wed Jun 23, 2021 12:51 pm Post subject: Re: Early 40 IDFs

Fyi the roller cam can get caught on some intake manifolds. Install on the intake and carefully check for clearance. I had to notch carefully or it would hang up.


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