The PAC Racing PAC-1281X-16 is a 1200 Series drag race beehive spring built for Gen 3 Ford 5.0L Coyote engines, covering 2018-2023 Mustang and 2018-2020 F-150 applications along with the 5.2L Voodoo and Predator engines used in the GT350 and GT500. The 1200 Series uses a premium alloy processed to aerospace shot-peening standards, aimed at builders upgrading a camshaft profile or rebuilding an engine that needs more fatigue resistance than a stock replacement spring offers.

PAC Racing Springs PAC-1281X-16 1200 Series Drag Race Valve Spring Set Features:

• Fits 2018-2023 Mustang and 2018-2020 F-150 Gen 3 5.0L Coyote engines, plus 2015-2020 GT350 and 2020-2022 GT500 5.2L engines
• 0.709 in. top / 1.031 in. base outside diameter with a 245 lb/in. spring rate, rated to 0.551 in. of valve lift
• 1.208 in. maximum coil bind height
• Premium alloy wire processed to aerospace shot-peening standards for superior fatigue dependability under repeated hard use
• Beehive taper reduces reciprocating mass for improved high-RPM stability versus a traditional straight-wall spring