Watto Part number of the engine is 498252. (Top points to you for quoting the engine number properly, and including the numbers cast into the block).
498252 is a B20A, originally fitted with an M40 transmission. Original head p/n is 460801-4 for that serial number - this version of B20A head has 44mm inlet valves.
The type number of your car is 1441342Y, yes? If so, that vehicle is an import, not a locally-assembled car.
You'll need the 462623-0 head gasket - applies to serial number 10627 for B20A (498252) according to the book.
You'll need the bigger 'O' rings for the water pump.
Forg Do you need more than “B20”?
Yes! Because there are different head thickness measurements, different inlet valve sizes, and different main bearing sizes, depending upon engine type and year of manufacture. e.g. B20B has two different sizes of inlet valves, depending on year. e.g.2 The head thickness will dictate the size of the two 'O' rings which go in the top of the water pump.
