DCH340 Variations?

[MicroMachinery]

I'm currently rebuilding a DCH340, but the parts sheet I got with the carb kit shows a blow-up of a different carburetor than mine, even though it's labeled as for a DCH340. After searching thoroughly with Google, It seems as though there are 2 different carbs that people are calling DCH340's. They are both found on L20b's, which is where I pulled mine from.

 

Here is one variation(not mine):

 

And here is the other(the one I have):

 

 

Does anybody have any insight on this?

 

I'm also having trouble finding jet sizes for my carb.. wanting to make sure they're correct. Thanks!

[Zeusimo]

I've Had Several

The On The Top Came Off My Truck

The Bottom One Came Off My 610 And 710

I Prefer The Top One

Jets From A NapZ Or Even A Chevy S10 Will Swap

[datzenmike]

Jet sizes changed for year to year, auto/standard, California/federal and the emission standards ... you name it. Very generally primary was 99 or 100 and secondary was 150-160. This will run but may be ever so slightly lean or rich favoring economy or performance. You would need a dyno and a wide band to tell the difference.

[MicroMachinery]

Came off a 620 L20b. The primary is 98 and the secondary is 170. The idea must be for economy putting around town, but a little less when opening her up.