FIA Homologation Papers & HTPs

[one-two]

John, I don't claim to be an expert in App K contents and interpretation, but here are some sections that may be relevant. (There is a new version of App K in effect from today, but these sections haven't changed.) Best, Robert

6.4 Engine
6.4.1 The engine components and ancillaries must be of period specification, must be of the same make, model and type fitted and conform to a manufacturer’s specification for which period evidence exists.
6.4.2 The bore of the engine must not be increased by more than the period specification, except in case of cars of Period A to D for which bore may be increased up to 5%. This operation may be carried out only if it respects the capacity limits of the formula to which the car belongs (see Appendix I).
6.4.3 Engines which were less than the upper capacity limit in period may not be enlarged beyond the swept volume employed during the car’s international life.
6.4.4 Only cars originally fitted with DFY engines may utilise DFY-derived engines. Cars fitted with Cosworth DFV engine may use any Cosworth DFV-derived engine component.
6.4.5 The stroke may not be altered from a dimension shown in a period specification.
6.4.6 Crankshafts, connecting rods, pistons and bearings may be of larger dimensions than the period specification, within the limits of the standard crankcase. They must be made from the same material type. The method of construction is free.