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What Is the Visible Difference Between LT4 & LT1?

They say don't judge a book by its cover. The same does not go for engines. The LT4 engine for the Corvette is distinguished easily from the lesser powered engine it replaced, the LT1, by a few physical characteristics.

  1. Intake Manifold

    • The LT4's most noticeable distinction from its weaker cousin is the bright red intake manifold. This intake manifold was specifically cast with a cherry tint to distinguish it from the LT1.

    Valves

    • On closer inspection, sharp-eyed auto enthusiasts will notice that the intake and exhaust valves on the LT4 are larger than those on the LT1. The intakes have a two-inch radius, while the LT1's have a 1.55-inch radius.

    Throttle Body Plate

    • While the LT4's throttle body is the same as the LT1's, it did get a cosmetic facelift. The cover of the throttle body in every Corvette installed with an LT4 is stamped with the words "Grand Sport" in red letters.

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