V8 to V4 Conversion: Get 40 Percent Better Gas Mileage

A V8 to V4 engine conversion will give you much better gas mileage for a small reduction in performance.

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Remove the outer four rockers from the right assembly. Seal the oiling holes as you did those on the left side.
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Wrap the four oiling holes that serve the center two cylinders' rocker arms (cylinders three and five) with brass shim stock. Secure these makeshift seals with 1" hose clamps
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The V8 to V4 conversion entails deactivating four cylinders (two, three, five, and eight). Expect up to 40% better gas mileage.
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Block the valve guides with 3/8" x 3" National Fine bolts, washers, and nuts to prevent air from being driven up through the guides into the valve covers.
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For the last conversion step, block the right throat of the two-barrel carburetor.  
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Fabricate "hydro-holders" for each of four sets of two lifters. First, notch a 4"-long piece of 1/8" x 1" x 1" angle aluminum to fit the grooves in the lifters. Then drill and tap the block, and bolt the "lifter locks" in position. 
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The leftover pieces after a successful operation. 

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