1981 70hp Johnson - In Need of Carb Screw Size

[TigerTom]

Hi Everyone,
Would any of ya'll by chance know what type of screws hold on the air intake box to the carb assemblies of a '81 70hp Johnson 2-stroke? It's item #12 from marine engine's diagram, which says it's a 0327794 at $6/ea (yikes).

I just bought this boat & outboard as a restoration project but the owner couldn't find the screws and I'm sure the local hardware store has these in stock. Just need to know what type, next step would be to take one of the carbs up there and do a little trial and error.

Thanks guys/gals, any help would be most appreciated.

 

[TigerTom]

Went to the hardware store to pick up a few sample size screws/bolts.
Still no luck but for future reference, they are not:
10x24 3/4
10x32 3/4
6mm x 20mm 1 pitch

But the 6x20 seemed to be the right diameter size, just wrong thread type. Going to head back and try again.

 

[racerone]

I believe they are 1/4-20 NC thread.

 

[TigerTom]

Yup, that did it. Thanks for the pointer