A machine shop removed about 0.25" on mine, yielded about 9.6:1 with flat top pistons.. So, probably around 0.2".

I did not replace the pushrods, but it's something easily checked when assembling the engine.

Ken C


I am  considering having the head on my Spitfire milled down to give me a
little more compression. It is a stock 80 head so it is currently about 7.5 to 1. I am thinking of taking it to about 9 to 1. Can anyone tell me how much
I would need to take off to get it to that compression?

If I  do have it milled down, do I need to get shorter pushrods or is that
within  normal adjustment.

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