A friend just completed a modified head. He put in large valves and removed the boss in the intake ports. Also done the porting of the chambers both intake and exhaust. Nothing radical on the porting,just a good clean up job with matching ports. Problem- when the head was torqued on the block the head had a leak around the #6 exhaust valve. This was discovered when new valve springs was being installed. Various gaskets have been used but still the same thing. In fact the last time it leaked even worse and around other exhaust valves. Have came to the conclusion the head is flexing in that area. Has anyone else had a problem of this kind with a modified head? Any feed back would be appreciated.
