HI Cooperess

you still have enough metal left no problems, you just need some 3mm spacers but you need to measure your spring heights for the springs you are using.
Graham Russell

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"It's better to be not informed than ill-informed"

Hi GR, That's great. I will be using Cooper 'S' valves and springs. I just want to bring the head back to standard. God knows why the inlet seats were machined deeper than standard.

Helpful pictures!