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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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
PHOTO: MICHAEL ROACH
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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.
MICHAEL ROACH
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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.
MICHAEL ROACH
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The leftover pieces after a successful operation. 
MICHAEL ROACH
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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. 
MICHAEL ROACH
058 v8 to v4 conversion better gas milage 03 block valve.jpg
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.
MICHAEL ROACH
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For the last conversion step, block the right throat of the two-barrel carburetor.  
MICHAEL ROACH











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