I installed a TRD/Kazuma Supercharger on my 1993 Land Cruiser a few years ago and have experienced pinging/detonation problems at hard acceleration and/or when the truck is running hot during the summer months in Las Vegas. Now the head gasket has gone out as well, although it only has 10K miles on the rebuild. Does anyone have any suggestions as to how to stop the pinging/detonation? Also, any suggestions on keeping the engine cool during heavy loads or in the summer time. Finally, is there a heavy duty head gasket set out there I can buy? I would humbly appreciate any advice anyone may have on these topics. Thanks in advance.