how well to they hold up over time? also theirs 2 different versions im assuming the 3651 is a mild cam and 3658 is aggressive? not much details or notes on them just specs
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So much info out there on the differences, scroll down to the ivo can thread...
Overtime, they're a quality product. I have 200k+ on billet 3651's and revving to 9k, over 8 years.
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