useing the stock bolts for water pump.its not a thinner bolthead .that is the one bolt i would forget to put in and water would just pour out when you filled the rad.
:lol::lol::lol::lol::lol::lol: BWAHAHAHAH! My dad and I just did this putting my 360 back together, I even picked up the chrome bolt we have that came with the rest of the dress up kit and my dad says I have no idea where you got that bolt from, we threw it on the bench and 30 min later coolant is all over the ground, we think its the water pump, gaskets all this crap, nope we left that FRICKING bolt out, so off comes the front of the motor again to put that damn bolt in!!!!!