Not Ranked
I am very pleased with my 32 month old 427SR.
It has a dual plane manifold and Holley 80770-1 vacuum secondary carburetor.
BTW....Goopie
Try opening up the 4 idle mixture screws about a half turn each. This may smooth out your engine a bit at slow speeds. If it doesn't help, you can change it back very easily if it doesn't help.
Jody
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Roush #1
Lone Star Classics
Roush Edition #01
Roush 427 SR #444
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