Carburetor jetting, Recommended base line jets for Weber 40s Options

[Slanski62]

Hello. I'm new to the forums here but have been reading and learning a lot. Thank you.

I have a pair of Weber 40s I plan to use on a 2056 I'm building. The carbs are used, and I don't know how they're jetted. Can anyone recommend a base line? I'm at an altitude of 486 feet. I appreciate any suggestions!

Steve

[amfab]

I have a set of IDF 36s with 32 venturis

It has 47 idles, and 145 mains with 220 AC,

It pops a lot, especially when cold on decel, and the transition isn't too smooth. Should I bump up the jet sizes a little ?

' 74 2.0 unknown cam—i assume stock.

TIA

-Andrew

[stugray]

I have a set of IDF 36s with 32 venturis

It has 47 idles, and 145 mains with 220 AC,

It pops a lot, especially when cold on decel, and the transition isn't too smooth. Should I bump up the jet sizes a little ?

' 74 2.0 unknown cam—i assume stock.

TIA

-Andrew

Look for manifold leaks

[porschetub]

I have a set of IDF 36s with 32 venturis

It has 47 idles, and 145 mains with 220 AC,

It pops a lot, especially when cold on decel, and the transition isn't too smooth. Should I bump up the jet sizes a little ?

' 74 2.0 unknown cam—i assume stock.

TIA

-Andrew

Look for manifold leaks

X2 on that ,many of the manifold kits come with thick paper gaskets that settle after time and leak,I would increase the idle jets to #55 seems to be the sweet spot for Webers,Dellorto's and the Zeniths used on the 911.
If your transition is still poor try dropping your mains down after going to the bigger idles,those mains you are using are a bit "fat" ,I would think 130-135 would be better with the vents you have,good luck.