The Toyota K series was a straight-4 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. With the exception of the 5K, all K engines have solid lifters and 1.5 ratio rockers with an adjustment thread for tappet clearance.
Toyota Unser in Malaysia is the latest K-series in Toyota. The 1.8 L (1812 cc) 7K was produced in 1983. Cylinder bore was 80.5 mm (3.17 in) and stroke was 87.5 mm (3.44 in). Output was 76 hp (57 kW) at 4600 RPM and 103 ft·lbf (139 N·m) at 2800 Was available with a 5 speed manual & 4 speed automatic transmission.
The 7K was the final revision of the Toyota K series engine before it was dropped from production in 2002. Boasting 1800cc and plenty of torque, this was an engine designed for and destined to be used in Toyota's Commercial series mini-vans. These can be found by searching for any later model Toyota Vans whose chassis codes begin with KR4xxxxxx
Essentially the 7K block was just a revised 5K (1500cc) design with identical piston width and specs? but the 7K was "stroked" ~300cc larger overall. This meant an engine with plenty of torque (pulling power) but not intended for huge revs or racing.
There was also a 7K-C (Carburettor) version earlier on, with the main difference being crank diameter was a couple of millimeters larger in the EFI engines to handle the higher torque. Also there are some holes in the 7K-E head that don't exist in any of the other K engines.
With a bonus for people with KExx chassis id'd cars, these engines are a much more straight forward "bolt-in" option (compared with Twin cam installations) with the promise of Bigger Torque, Bigger Power and the best benefit of EFI !
The 7K-E inlet setup features a much shorter and efficient runner design than the 4K-E did.