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P/N 12639 10-micron Microglass
FUEL PRESSURE STABILITY
RPM & boost for consistent performance at the start line
True conical valve springs are not a new concept and are industry proven to provide several key advantages over traditional spring designs
This new position makes it so the bypass hole can never fully close
Ferrea Dual Valve Spring Kit for Toyota Supra 2JZ 2JZGE 2JZGTE - KT4046 r35 part P/N 12639 10-micron MicroglassFerrea Dual Valve Spring Kit for Toyota Supra 2JZ 2JZGE 2JZGTE Part # KT4046 The Ferrea Dual Valve Spring Kit is what we use in all of our in house builds. Ferrea makes the best valvetrain parts in the industry, hands down. Kit includes the following: Dual Springs #S10178 (24) Titanium Retainers #E11145 (24) Seat Locators #SL1173 (12) Valve Locks #K10037 (24)
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