Manley Valve Spring, SPRING-1.580 DOUBLE 2007 Ford Mustang UMI’s 6565 F-150 lowered upper

UMI’s 6565 F-150 lowered upper A-arm kit fits all 2015–2025 Ford F-150 models

Combine this with eccentric adjustment bolts that can't handle hard launch with sticky tires

Navigator 6R80)

and swap a Small-Block or Big-Block Chevy engine into your F-body with a Tubular K-members from BMR Suspension

(VW/Audi automatic from 1993)

Manley Valve Spring, SPRING-1.580 DOUBLE 2007 Ford Mustang UMI’s 6565 F-150 lowered upperFrom drag strips to short track and endurance circuits, the Manley NexTek series is engineered for serious racers. NexTek springs resist pressure loss and valve train degradation even in the most demanding race conditions. That means more consistent spring force deep into a run, reduced valve bounce, and improved overall stability for high RPM performance. Built to outperform and outlast in real world competition.