A FWIW....
I have a solid roller from Bullet received quite some time ago, currently now in storage. I looked and it has hints of copper between the lobes.
There where no issues with it but I decided to change cams. The solid roller cam that I replaced it with and installed is also from Bullet. No clue if it is similar though.
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/
Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine)
Best time 5.13 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE
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