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Thats around where i was thinking, will give it a try.

Just an update, comverted the metering blocks on the old 750hp to adjustable power valve channel restrictors and adjustable idle feed restrictors. Dropped the ifr size from 35 thou to 31 thou and it now cruises on the transition slots at 12.8 to 12.9. Increased the pvcr size from 61 thou to...

No problem yellow rose, i havent had much chance to get out to do any more tuning since the weekend. Havent read much about limiting the t slot circuit but that would make sense as i think that is where it is running the richest before it comes on the primary jets. Is this a better method than...

Carb is later than a 4779, its a 750hp with adj air bleeds. I had a 4779 on it originally. The hole originally was at low to mid speed crusing and give it a quick stab on throttle, seems much better with the 10.5" pv over the 6.5". Wide open throttle was always good with the 74/82 jets and...

Carb is 750hp with four corner idle and adj air bleeds. I will double check the transition slots they were set years ago but may have changed fiddling with idle speed.

Power valve is new and idle mixture screws are sensitive to minor adjustments so i think its fine

Just been doing some experimenting with the 750 HP Holley double on my 408 small block 69 Barracuda after reading the power valve thread. Fitted an afr gauge to check the cruise afr's. Original setup after dyno was 74/82 jets, 6.5 power valve. Seemed to cruise rich and had a hole in the middle...