Speedex Heads

[Ian Williams]

Alan, sorry to be pedantic but in one of your posts you referred to the 9E heads as being the same design to the 37 heads, I would argue against this statement. The combustion chamber and plug placement of the 9E, reproduction or not, is noticeably different to a 37 head, I agree however that other than the improved plug position reducing fouling issues little noticeable performance is to be gained with the 9E. I agree to that the LRM head is a good one, mine worked well but did not last long! The problem is that many of our opinions are somewhat subjective unless someone were to dyno a whole range of the options out there on the same engine we don't know for sure, then there are all the other variables, cam, valves, manifolds etc which come into the equation.