Thermo-quad Tips

[S/ST 3040]

I appreciate all the tips. I have it together and ready for testing.
I need to make a new tool for adjusting the air door spring.


Jim, I did get your message.

[GTX JOHN]

Primary only....Secondary are very unique tall jets and not readily
exchangeable for anything I an aware.

[GTX JOHN]

You can drill stock secondary but start with 131 or larger as approach angle is different on small size.


I would love to find some more original 149 jets!

[Denny Steward]

John,
How many .149 jets are you looking for I have some

[James L Miller]

Has anyone ever made any jet extensions for the secondary that a standard Holley jet would screw in the end? Might have to get the alcohol jets to get ones that are big enough?

[Myron Piatek]

Originally Posted by James L Miller

Has anyone ever made any jet extensions for the secondary that a standard Holley jet would screw in the end? Might have to get the alcohol jets to get ones that are big enough?

I had a similar thought about the screw-in jet extensions that somebody makes. I'm sure if the height is critical, they could be cut & re-tapped, if needed.

[James L Miller]

They could be made on a screw machine if there was enough demand? I'm guessing not that many people would need them. Could run them on a CNC lathe for lower volumes. I'd have to dig out my TQs to see what threads are on the jets and dimensional data.

[tpoh815]

Jet # size can still be found if not re-drill and ream!
120-339 .110
120-340 .113
120-341 .116
120-342 .119
120-343 .122
120-344 .125
120-3113 .113
120-3116 .116
120-3119 .119
120-3122 .122
120-3125 .125
120-3128 .128
120-3131 .131

120-5110 .110
120-5125 .125
120-5131 .131 *
120-5137 .137 *
120-5143 .143 *
120-5149 .149 *

[Denny Steward]

I make sec. jet adapters to use holley jets been doing this for over twenty years if interested PM me

[GTX JOHN]

PM Sent