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Hello,
The original SWAG steel timing gears had double the teeth on both the cam gear and crankshaft gear compared to the fiber gear set up.
I believe the R-Sport timing gears, however had the same number of teeth as the fiber gears.
If you are changing from a fiber cam gear set up to steel gears, you should change both gears as the hardness of the gears should be matched.
If you are installing a new fiber gear, you do not have to change the crankshaft gear as long as the crankshaft gear is already for a fiber gear.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502
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