well i have a 93 6.5 with 140,000 on it and its out of the motor and im going to regasket the motor i was told to go with the thicker gaskets on a stock motor....now can i do that? please let me know asap wanting to start it today....thanks

No need to go with thicker gaskets unless the block deck or heads are warped and need to be resurfaced. Have them checked for flatness with a machinist's straightedge. Don't resurface unless you have to and there are limits on how much can be ground off. Some think that thicker gaskets are more prone to failure than the stock gaskets - I don't know for sure. There are some specially made thicker gaskets out there that are more reliable and quite spendy. Don't remember the brand though. Clean the block deck and head surfaces really well, follow the torque sequence carefully and use new head bolts.

The stock original head gaskets usually succomb to the compression ratio of 21.3 to 1.pushing certain areas on the deck & cylinder heads to eventually leak coolant,then compression. Thicker gaskets will lower the compression ratio.That is a good thing as lower compression ratio has benefits. Such as being able to make more power with an increase in turbo charger pressure.The next simple steps should be an intercooler & turn up the fuel some. Look at what the MFR's have acheived applying these principles to make more power. Also you need to install the stock 1999/2000 water pump,fan blade & fan clutch to increase the engines cooling ability & reliabilty.With the cooling system changes.The single thermostat & crossover will work fine with the increaseed water pump volume!

The stock original head gaskets usually succomb to the compression ratio of 21.3 to 1.pushing certain areas on the deck & cylinder heads to eventually leak coolant,then compression. Thicker gaskets will lower the compression ratio.That is a good thing as lower compression ratio has benefits. Such as being able to make more power with an increase in turbo charger pressure.The next simple steps should be an intercooler & turn up the fuel some. Look at what the MFR's have acheived applying these principles to make more power. Also you need to install the stock 1999/2000 water pump,fan blade & fan clutch to increase the engines cooling ability & reliabilty.With the cooling system changes.The single thermostat & crossover will work fine with the increaseed water pump volume!

thanks for the info and i do already have the dual thermostat the duramax fan had a upgrade waterpump but let it go with my old motor but will get another one this week....