guys and gals, i did a compression test on my 5efhe today in preparation for turbo'ing and putting in my GT. the test was done WOT and the first number is based on 4 revs/turns of the key, the other is max reading. Piston 1 - 160psi (max = just under 200psi) Piston 2 - 145psi (max = 170psi) Piston 3 - 150psi (max = just under 170psi) Piston 4 - 90psi (max = 105psi) My plan was high compression td04, i take it number 4 needs sorting - what about others? cheers