1974 Thermoquad, 360 HD Truck , Rebuild adding performance modifications

ch1ll said

You got to be careful enlarging air bleeds as they are cast into the aluminum top. Then again you could hard solder them shut and redrill them, but that would be a pia.

To dial in a carb, it should be done on the dyno anyway. Reading plugs is like reading a crystal ball.

You would need a roller dyno and an operator/tuner with good TQ experience.

I have the idea of drilling and tapping for Holley air bleed jets. Also I can’t figure out where the emulsion tube is. That there is a big part of tuning out lean/rich spots in your fuel curve. I wouldn’t say I’m real knowledgeable about exactly how a TQ works as there few in depth books about it. I’m on the learning curve here.

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Yes, 100% correct that a Dyno tuning would get max hp
For street the cost of a Dyno With an expert is not worth the $ per horsepower for me. If I werea steeley eyed NHRA Class racer that would give anything for another tenth of a second yes.
There's a ton of info out there on TQ's, a LOT of it is repeating.
I have had to seriously dig to get performance mods/tuning info.
I looked at my notes again, I jotted down from three sources .096, .098, and anywhere in the
.090 to .100 range.

This is probably a dumb question. Is it a different concept, but would drilling 1/16 holes in the primary throttle plates do the same.as opening up the air bleed hole ?
I'd like to try something even call .095 good enough for now and move on
If I screw it up I've got 30 more in the shed