Hi Guys how much boost is safe on GRP A head bolts & gasket when clamped to an RS500 bolck (7.2CR) ?

And based on the max boost from the above what approx power 'could' the engine make with correctly speced injectors, turbo, map etc ? For info the cams are standard and the head is ported and polished.

Thanks in advance for any replies / guidance.

WD