I have question about cam sprocket. What are differences on use with these two sprockets in picture? When I had flat tappet cam on engine there was that darker color sprocket. Then I changed roller cam (Howards) and changed that other sprocket to engine. After that I have small whining noise from engine and sound changes when revving engine. Block on my car is '79 302. Are those two sprocket interchangeable? Thanks for info !
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