Hi,
Depends on cc of the engine, 40 to 50mm, some are parralel bores but most are tapered. taper from 42mm engine side to 50mm airfilterside is most common I think. There is a lot of information about this on locostbuilders.co.uk and various english ford and zetec forums.
Super cars
Sports cars
Depends on cc of the engine, 40 to 50mm, some are parralel bores but most are tapered. taper from 42mm engine side to 50mm airfilterside is most common I think. There is a lot of information about this on locostbuilders.co.uk and various english ford and zetec forums.
Super cars
Sports cars