Hello Griff,
I have been running a set of the Thorley Tri-Y headers for a couple of yearss now on my 78 clipper with the 440 engine. thou I haven't put a huge amount of miles on my rig I feel they are worth the money.
nice heavy construction and they are plated for futher rust protection. I did have a small issue with fit on the Rt header down where the flange gose past the lower A arm rear support bracket. I needed to cut about an inch form the bracket. The cut didn't affect the bracket as far as a safety stand point. This could have been something strange with my Clipper? The engine runs cooler and the power at low end is good. they sound pretty good too.:D
