GM 5.3L Aluminum Gen IV Long Block Engine

The Thompson Motorsports GM LS Sleeved Long Block represents a robust solution for enthusiasts seeking extreme performance from their LS-based engine. Built around a GM 5.3 Aluminum Gen IV Block, this assembly is fortified with Darton Sleeves to reliably manage significant power output, rated up to 1200 horsepower at the crank. The foundation of this long block is its all-forged internal rotating assembly. It features custom CP Carrillo pistons, forged Callies Compstar connecting rods, and a forged, center counter-weighted crankshaft, ensuring durability under high stress. Components like King Racing main and rod bearings and ARP main studs are included for enhanced reliability and performance. Buyers can specify either a 24x or 58x reluctor for compatibility with various engine management systems. Complementing the short block is a performance-oriented top end. This includes Frankenstein M311 Heads, engineered with LS3 ports for optimal airflow, and FED billet rocker rails. A custom Cam Motion camshaft dictates the engine's breathing characteristics, paired with a complete timing set. The package also includes a Moroso HP/HV oil pump for essential lubrication, trunnion upgraded rockers, TMS link bar lifters, and chromoly pushrods. To further support engine longevity and performance, a 12-month unlimited mileage warranty is offered when purchased with a qualifying oil pump, such as the Melling 10295 for naturally aspirated applications or the Moroso 22120 for engines with power adders. Finance options, including Advancial and Affirm, are available.