cylinder heads stages

[Guest cortinamad-gonetoo]

how do you dertirmine if a cylinder head is stage 1 ,2 ,3 ,4

 

anybody

 

mines ported and flowed to the limits standard exhaust valves (36mm), bigger inlet valves 44.5mm rather then 42mm all valves wasted, head skimed 30 thou and a fr32 cam vernier pulley on a pinto ...... what stage is that

[SmokeEm]

No golden rule but usually Stage 1 is just skimmed n flowed, Stage 2 is bigger inlet, Stage 3 is bigger inlet & exhaust & stage 4 doesn't really exist but if it did it would be mega flowed & hand finished etc.

[Guest cortinamad-gonetoo]

cool so mines stage 2

 

just so i can update my tech spech sheet

[V8ian]

its a head refurbishers term, and normally specific to that company, my heads a stage 4, as they are larger TVR challenge valves fitted into his stage 3 big valve heads, with more porting around the seats and throat,