Flexplate Kit - LSA LSX LT1 LT4 - 8-Bolt SFI

The Flexplate Kit - LSA LSX LT1 LT4 - 8-Bolt SFI from ATI Performance is engineered for enthusiasts and professional builders who demand reliable power transmission in high-performance engine swaps. This component serves as the critical interface between your engine and transmission, designed specifically for GM's modern small-block platforms including the LSA supercharged, naturally aspirated LSX, and the legendary LT1 and LT4 variants. The 8-bolt configuration with SFI certification ensures compliance with sanctioning bodies for both street and competition applications, providing the structural integrity required when upgrading to forced induction or maximizing naturally aspirated output.

ATI Performance's flexplate design balances rotational mass efficiency with durability, utilizing precision-machined construction to maintain exact concentricity between crank and torque converter. The 8-bolt SFI-rated design accommodates the mounting requirements of modern torque converters and transmissions while distributing stress evenly across the bolt pattern, critical when handling elevated horsepower loads that stress standard equipment. The kit weighs 9.05 lbs and ships at compact dimensions (14.6 x 1.35 x 14.75 inches), making it straightforward to integrate into engine assembly sequences. SFI certification demonstrates that this component meets safety standards for vehicles used in sanctioned racing environments, adding credibility for both street and strip applications.

This flexplate is ideal for builders swapping LSA, LSX, LT1, or LT4 engines into platforms originally equipped with different powerplants, or for those upgrading existing installations to handle additional boost or nitrous applications. Installation requires engine removal and transmission separation on most vehicles—a task typically handled by professional shops or experienced builders with proper equipment. Verify torque converter spline compatibility and bell-housing bolt pattern before purchase to ensure seamless fitment with your specific transmission. The SFI 29.2 certification makes this the appropriate choice for competition vehicles and high-output street cars where component failure carries significant liability.