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The biggest issue the original CPPA headers was quality & fitment. They went thru a couple builders before they found a good one. I actually have 35+yr old CPPA 2" headers on my RB powered race car (Avatar) They fit excellent and seem to work - 3650lbs, 9.94@133mph
With the old CPPA headers if you used them on a "B" block you had to space the drivers side header out from the head with an extra header flange to make 'em fit - TTI corrected that issue with their "B" version. I Believe there were other improvements but I don't know the details. Some more...
The TTI headers were/are a close copy and improvement on the old CPPA headers. Roland Osborne the founder of Chrysler Power Magazine & CPPA was friends with the owner/founder of TTI and helped him get started -
I voted for motor because that's the term I naturally go with even though I know it's wrong. I made the mistake of pointing out the difference between the two to my daughter - now she busts my chops every time I say "motor" !