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Clone jet thread size

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devino246

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One of the genius POs of my '79 F150 decided to bypass a 4 port vacuum switch and throw out the spark delay valve which allows a limited amount of vacuum to reach the distributor during warmup. I need to get that part, but no parts vendors sell them. Its basically just a piece of plastic with a small hole in it, so I figure the main jet for a small engine would be perfect. I could dial in the desired vacuum level by drilling out the jet. Does anyone know what thread size the jets are?
 

Doc Sprocket

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I don't know (offhand) the thread size or pitch of a clone jet- but I'll bet it's metric. What size/thread do you need? Can you just use a low-grade setscrew and drill a hole it it or something?
 

devino246

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I don't know (offhand) the thread size or pitch of a clone jet- but I'll bet it's metric. What size/thread do you need? Can you just use a low-grade setscrew and drill a hole it it or something?

I'd need to get a numbered bit set, which Id rather not have to pay for atm.

I probably should have explained more. Heres the original part:



My plan is to find a piece of pipe that I can thread the inside of and screw in the jet. Then I'd attach vacuum hoses to each side.
 
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