As above got a question regarding my Comp Ratio.

I built my engine to 7.5:1 comp. We then decided to use a thicker Cometic multi layer head gasket instead of a Grp A, which dropped it lower again. Car was mapped a few weeks ago by Ahmed and at my request mapped Safe as i will give the car lots of abuse.

The problem i have now is the Cometic Gasket has started to pressurise the system[like many others], now i want to just fit a Grp A instead as never had a problem with these. I know its going to raise the comp and bring it back up to 7.5:1. What i want to know is does it need to go for another session of mapping or will it be alright?

Cheers Nash.