The BTR-VVT-GENIV-LO phaser lockout is designed for Gen IV LS engines to completely eliminate variable valve timing (VVT) movement, locking the cam phaser at 0 camshaft degrees of retard. This creates maximum piston-to-valve clearance and ensures consistent timing for high-duration camshafts in aggressive builds.

Brian Tooley Racing BTR-VVT-GENIV-LO Includes:

• One billet phaser lockout block (0 cam° retard)

Brian Tooley Racing BTR-VVT-GENIV-LO Features:

• Locks intake cam phaser at 0 camshaft degrees of retard (fixed timing)
• CNC-machined billet aluminum construction for strength and precision
• Eliminates VVT movement entirely — ideal for maximum-duration cams and high-boost/competition applications
• Ensures repeatable cam phasing under extreme loads and elevated cylinder pressures
• Installation requires phaser-sprocket removal tool and correct alignment to guarantee performance

Brian Tooley Racing BTR-VVT-GENIV-LO Notes:

• Sold individually; select quantity in accordance with number of cam phasers being locked
• Compatibility strictly for Gen IV LS engines with VVT phasers; confirm engine variant before ordering
• Tuning changes required to accommodate eliminated VVT range and altered valve timing behavior