I'm not sure that I actually ran the silver sleeves on a motor.

I flowed that combo, and there wasn't any additional flow compared to the 1.562, but there was a reduction of booster signal.

This was actually on the predecessor to the Demon carbs..... The "Gold Claw".

On the dyno, the two best combos I played with on that carb were the 1.562/annular, and the 1.425/downleg.

I sold that carb to Brad, and iirc, his best ET's were using that 1.425/downleg combo.

I've had a reworked old school Holley 850 annular since 1991 that's always worked really good for me. Neither of those combos on the Claw were any "better"(although very close)than that old Holley, so I sold it off.