Originally Posted by
Rob_DOHC
Why do you need to lower the compression ratio? I wouldn't on the next engine i build.
There are people with over 300brake and a standard ish compression ratio.
PS, my pistons were skimmed, standard mahle. But as above, i wouldn't again. But i would definitely use ford gaskets ALL the way through.
Rob,
My tuner reckons the comp ratio is too high. It was something like anything over 12degree's ignition and 13psi of boost it would det regardless of what he did. As far as I know the head has been skimmed twice which he said could affect it.