Thermoquad mods that work.

Bewy said

Rumble.
No, have not enlarged those fuel supply passages. I see no flow restriction. For a couple of reasons. The passages are already much larger than the biggest n/seat you can fit [ 0.120" ].
The entry passage is huge & the branches to the left & right fuel bowls are at least 9/32" [ 0.280" ]. This fuel is delivered by pump pressure, not gravity, so I see no need to enlarge the passages.

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Thanks. I can’t say I have had a particularly power mill under a TQ yet. Moving a 3700 E body Cúda into the 12’s is a nice street engine but I did t feel the TQ was taxed on top of the 360 ether.

.280 inside diameter is healthy enough I guess. IDK personally. But I was interested to know. Just haven’t cut one up for it yet. Like you said, the needle and seat is the smallest restriction in the path way. While off hand I don’t know what the needle and seat are capable of flow wise, so long as there’s adequate fuel supply and pressure there it’ll be fine. That’s what I think my questioner was worried about. The mention of more fuel at the needle and west was mentioned.

That’s where I had to throw in the towel and said, I, myself never had a problem there nor did I know of anyone that did. Even with 90* turn passage ways, it’s always been fine. Though, again, I feel that I haven’t taxed the system yet. With a 3/8 fuel line to the carb, it’s a lot fuel available. A 3/8 line can provide enough fuel for a pretty darn powerful engine.