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Tri-Power was the name for an arrangement of three two-barrel carburetors [1] installed on large performance V8s offered by the Pontiac Division of General Motors in the late 1950s and 1960s. [ 2 ] Three individual Rochester 2G carburetors were arranged inline on the intake manifold, the center one operating normally and the outer two acting as ...
Several LS-7 intake manifolds were individually produced and sold to the general public by a few Chevrolet dealers as optional performance parts. The LS-7 was later offered as a crate engine from Chevrolet Performance with an officially rated power minimum of 500 hp (373 kW) gross.
It offers the airflow of more expensive heads, at a much lower cost. It does, however, require a specific intake manifold (the L31 has four bolts per head attaching the intake manifold, as opposed to the "traditional" six bolts per head found on older Chevrolet small-blocks). Chevrolet's L31 was replaced by GM's LS-based 5.3L LM7 and 6.0L LQ4.
Aftermarket port fuel injection and re-engineered cylinder heads have been the norm, although parts for the inline-six, such as aftermarket intake manifolds (from a three-carburetor setup or a single 4-barrel carburetor), exhaust headers, and hybrid cylinder heads based on Chevrolet's small-block engine are costlier than those for the small ...
The 260 was designed for economy, and was the first engine option above the Chevrolet 250 straight-six, then later the 3.8 L Buick V6, which was standard fitment in many Oldsmobile models by the late 1970s. While the 260s were not very powerful compared to the larger 350 and 403 V8s, fuel economy was almost as good as the base V6.
In 1967 Chevrolet introduced the L71, a variant of the L72. This new engine had three 2-barrel carburetors - known as "tri power" - in lieu of the single 4-barrel of the L72, and a 435 hp (324 kW) rating. Aside from the intake setup, the two engines were identical.