Re: Enter stage left
stages are determined by the engine builder and don't really mean anything.
By rule of thumb their are normally 5 stages.
stage 5 being full race motor.
Stage 1 is a stock motor normally but some say it's a mild engine(cam exhaust)
I would define it as this:
Stage 1: Exhaust, extractors and cold induction
Stage 2: Mild cam (as in still works with current engine management) exhaust, cold induction.
Stage 3: more wild cam, exhaust, air, chipped ecu, larger injectors.
Stage 4: after market ECU, custom head, balanced and blue printed block with hardened rods and crank, wild cam, large injectors, exhaust, custom air intake,
stage 5: fully custom inlet and exhaust manifolds, custom ecu, fully ported head with larger race valves and double valve springs, race injectors (nearly straight fuel) fully custom block with race everything fitted (normally $8000+ for this sort of block depending on the amount of Cyl) blah blah blah.
So yeah basically it's a rough guide to say how tuff a motor is, I don't hear to many people claiming to have stage 6 anything (except maybe some ricers with a stage 11 exhaust or something)
Breathe! It's only the internet....