No, IIRC, all of the Ferrea models require new retainers and spring seats. Portflow springs fit just fine on the stock retainers and spring seats.
I'd personally go with Portflow on a street engine, and Ferrea on a race engine, or a street engine that you'll check the retainers for wear on a regular basis. The Portflows are more of an install and forget type of item.
Regardless of which brand you use, I'd certainly do a manual check of the spring travel to ensure that the spring won't bind at max lift. The specs might show one thing, but I'd certainly verify the numbers prior to installation.
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Originally Posted by GroundZero112
little off topic but portflow springs with stock retainers is fine right?
how about ferrea? can the stock retainers fit on them too?
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