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Duration (E) Profile - "Stage2" for built engine mid/high rpm motorsport applications running 58 to 66mm turbo size
Internal partition boosts cooling efficiency
Non-TGV lower intake manifolds from JDM V7 Spec C
Endurance spring kit is identical to what Cosworth used to offer for their head packages
GSC Beehive Valve Spring and Ti Retainer Set EJ DBA Duration (E) Profile - "Stage2"KEEP YOUR VALVES UNDER CONTROL GSC's beehive valve springs utilize a progressively wound spring design manufactured using a high quality ovate wire. The benefit of this is a stable spring design and a natural frequency that is superior for high rpm use and high boost conditions when running an aggressive camshaft profile. A beehive spring design outperforms single or dual straight spring designs. The reduced top diameter allows for a titanium retainer
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