The Toyota K series was a straight-4

Straight-4

The inline-four engine or straight-four engine is an internal combustion engine with all four cylinders mounted in a straight line, or plane along the crankcase. The single bank of cylinders may be oriented in either a vertical or an inclined plane with all the pistons driving a common crankshaft....

 engine produced from 1966 through 1988. It was a 2-valve pushrod engine design, a rarity for the company.

All K series are non-crossflow engines — the inlet and exhaust manifolds are on the same side. They have cast iron blocks and aluminium alloy heads, with a crankshaft supported by 5 main bearings. K series motors have both Hydraulic tappet or Hydraulic Valve Lifters, solid lifter

Lifter

Lifter can mean:* Ionocraft, a device that can generate thrust using ionised air with no moving parts* Tappet, part of an internal combustion engine that actuates a poppet valve through rocker arms and pushrods...

s and 1.5 ratio rockers with an adjustment thread for tappet

Tappet

A tappet is the noise made by a worn cam follower, however the term is widely used to represent the cam follower itself. In mechanical engineering it is a projection which imparts a linear motion to some other component within an assembly...

 clearance.