mast motorsports harrop L8T

Herop blown L8T on the dyno – Dubai Car News

IIt’s no secret that Ford has dubbed the Goldzilla with its 7.3-liter pushrod V8. Built primarily for use in F250 trucks, the Godzilla is also proving popular as a boost-ready crate motor for the aftermarket.

GM has a similar offering, though it doesn’t have as many cubes or such a catchy name. Nevertheless, the 6.6-liter L8T is going to be an important part of GM’s arsenal in the aftermarket.

The iron-block L8T in stock form makes 401hp at 5200rpm and 464lb-ft at 4000rpm. Like the rest of the Gen V or LT family, the L8T runs direct injection.

The compression ratio is 10.8:1, a touch down on the L8T’s smaller cousins. Other key specs include aluminum heads, forged cranks, forged powder metal rods and hypereutectic pistons.

Street Machine Features Mast Motor Sports L 8 T


The aftermarket is already on the case, as Harrop’s crew found out when they visited Mast Motorsports in Nacogdoches, Texas.

Street Machine L 8 T Supercharged


Mast is currently testing one of their L8T crate motors with a 1046hp Harrop port fuel injection option strapped atop a TVS2650 blower.

With a 102mm throttle body and running on E85 fuel, the blown L8T engine makes 1046hp and 958ft/lb on the dyno.

As GM pulls back production of LS-based motors, expect the L8T and other Gen V-based mills to move down the line.

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