Ok I now have an answer as to why the Wilwood didn't fit. I purposely bought an English and metric Wilwood thinking one or the other would fit. Tried them both and it didn't work. Took them both back to summit racing and noticed they gave me two of the same English threaded valves at two different prices!! I just assumed one was English and one was metric. With all of the responses saying the Wilwood was a direct fit, I knew something was wrong.
Bought the metric valve and it fits! Mystery solved and I'm on way. I'll be installing a bracket to hold in place too.
Back to the locating the problem and the totally clogged, original valve. I undid the inlet line, pumped the pedal and gushed fluid, soft pedal to the floor. I reconnected inlet and disconnected outlet line, nothing, and the pedal is very solid, no mushy feel. Valve must be really clogged to close off the system to the rear.
So asking all the Wilwood replacement people who have them on their Alfetta, GTV6, Milano, how many turns did you go to get the brake feel you like in the rear? Tech specs say when fully closed, valve turns down the rear bakes 57%. I plan to experiment from fully closed and go on from there and look at my skid marks while braking. I looked it all up on the Miata BB. they go through the same thing.
Is this conversation about braking bias someplace in the AlfaBB performance section?
'76 Alfetta GT, 2013 Fiat 500 Abarth, '78 sports sedan (2 of them) - sold, '91 164L - sold, '83 GTV6 -sold, '87 Milano Verde - sold, '91 spider -sold, '69 MGB GT,