Pressure in cooling system

[pugbug]

Thanks for the reply. it's a 17/20 hybrid with 360 thrust bearing I'm using. I think using a long silicone pipe to the from the wastegate to the boost controller has caused this, I've seen readings of 27 PSI before it stabilises to 20PSI, too many times has caused it to blow. It's confirmed either a head gasket or cracked head. I've got a spare head, I'm getting that skimmed and ported and it's back on the road.

Reckon it can be taken out and dropped back in a day? I've got air tools.