My 904 valvebody

CudaFactHackJob said

This one was slant six. It's been a while but l'm pretty sure the double wrap doesn't have a strut that can drop out to increase clearance enough for the arm to swing out of the way. I never liked the double wrap because the adjustment is very loose and l felt that encourages piston misalignment.

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Your correct about the DW band not having a strut to remove. I know it specifies a much looser adjustment than the single wrap band but there's not really more clearance between the lever and piston to let the piston. The band due to it's design is more "springy" so it has to be looser. At least that's what I gather from looking at it. BTW I rarely go by the factory specified settings. I generally adjust the band so that it's just barely contacting the drum (felt while spinning the drum by hand) then back off till it doesn't touch. When I did the 904 in my car I used all premium parts due to it being behind a healthy 408 and if I remember right the rear band adjustment ended up at approx 3 turns