[Roush #1]

Ward,

Just to add a bit to this mix .... my repair, from a blue dot to a green dot ....
did not involve a jet change, air bleed change, idle air bleed adjustment, or squirter change.

I checked all of these on the original blue dot and they were the same on the green dot replacement carburetor. What I am saying is the difference in the two carburetors on mine was not visible.

I am aware of one more Roush engine that was built about the same time that had very similar problems. I have heard there are more, but I do not know that for sure. Mine was number 444 and I think Maxx was somewhere about the same time.

Don't give up on the engine. It could be as simple as an air bleed adjustment.

I understand your frustration, but the 427R should not be "bucking like a horse" when it is properly tuned. Mine runs smoothly in any gear at 1,000 RPM and idles well at 800 RPM - and yours can as well.

Gearing has something to do with it and it should be more prone to buck at higher gear ratios (lower numbers), but when I am in 6th gear (.62:1 ratio) with 3.89:1 rear gears, not many Cobras are geared higher which normally causes the bucking.

Good luck!

Jody