I'm going to be taking my head off soon and will be replacing my valve guides for decent strong bronze ones. Where can I buy these at a good price? Is it worth spending a bit more and going for those Colisbrowhatsis? (spelling?)
Also, while the head is off, would it be worth getting some high flow valves? They would cost just under £90 for a set of inlet ones. How much power will these genuinly give? I suppose I could go for some 6mm or 5mm seam valves if I'm doing the guides anyway - are these worth it? Are they strong?
So many questions - doh! Obviously I want as much power as possible, but I'm not made of money - I need best bhp per pound.