Notes on Cylinder Crankcase

Short block engine
For the engines 615, 616, 617.91, instead of non-uprated short block engine models, only uprated engines will be kept available on stock following the exhaustion of stocks.







A Circular combustion chamber trough (non-uprated)
B Star-shaped combustion chamber trough (uprated)

These uprated short block engines are characterized by the pistons with star-shaped combustion chamber trough (B).







A Prechamber with oblique burner bottom (non-uprated )
B Prechamber with spherical burner bottom (uprated)

For installing an uprated short block engine, use the prechambers with spherical burner bottom (B).