My Doug's D567 have 1 3/4" tubes and 3" collectors, not 1 7/8" tubes and 3 1/2" collectors as in this ongoing post. I believe I purchased then in 1974 to put a Ram Air 4 in my 67 GTO, cost at the time: ($150.00) Only issue I had was having to move the brake distribution valve out of the way on the frame. Regular size oil filter can't be removed without taking all the bolts out of the right header and collector, makes a slight mess.
As I noted earlier the flanges are not 3/8" thick at the heads!!
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