That is crap! im not going to buy anything from TTI, the amount of problems people have had with theire products is shocking! its not like there headers are cheap either! Lwet me know what they reply, would be interesting to hear.
I found the problem today when I got a very quick reply back from TTI. They sent 3 photos of their mockup with the headers and 9523 starter and there is lots of clearance - (except you have to do a bit of grinding on the block - which is no big deal)
Then I looked closer at their photos and the starter shown has 5 clockable positions as opposed to only 4 on my new one!!! It needs the 5th position to clear the header pipe!!
I'm waiting to hear back from Powermaster - but sure looks like they made a design change from 5 to 4 positions.
The first photo shows a closeup of TTI's mockup and 5 position starter and the 2nd shows my new starter with 4 positions.
Bottom line- until I hear otherwise - DO NOT buy the TTI6.1HCA headers and a new 9523 starter - they will interfere.