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Lifters are the mechanical link between the pushrods and the camshaft. When a engine is cold, there is a gap in the valve clearance. As the motor warms up, the metal expands and the gap shrinks. Solid lifters require a adjustment from time to time to keep the gap within spec. Hydraulic ones negate the need for adjustment, however they sap a bit of power from the engine.
Small/big blocks usually refers to two GM engine families that use a basic block architecture.
The small block uses the same block from displacements from 262 to 400 cubic inches.
The big block uses a larger block from 396 to 572 cubic inches.
A big block 350 may be referring to the 348 engine in the late 50's. Other than that, im not sure what they are referring to.
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Saved by the buoyancy of citrus.
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