get a block test kit from ur local auto store. it tests ur coolant for exhaust.
I would advize that u change out ur hg if it hasnt. even if it's stock.. retorquing it may not help. since u have to have everything off to retorque... mightaswell change it out. with a good hg.. and some arp bolts/studs. better to do it now then to let it blow later and do some damage.
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