This spring kit from Rocket Motorsports have been tested in a variety of applications, you will have no problems with valve float at high rpm with this HD spring set. We use these exclusively in the shop on all cylinder head builds we do. Pair fantastically with Stage 4 cams from Rocket Motorsports
Available for D series DOHC ZC /a1/a9 cylinder heads.
Included in kit;
Rocket HD Springs (Japanese Wire Wound in USA)
Forged Valve Locks
Viton Intake seals
Viton Exhaust Seals