Hi,<br />Just got done doing a bunch of neglected maintenece on my dads boat. Put a new head gasket on, Torqued it to 270 inch pounds, (as called for) When we started the engine, the gasket would slowly leak water all around it, to the outside. Re-torqued (with calibrated Snap-on torque wrench) Started motor, same problem.<br /><br />All bolt threads were wire brushed clean.<br />All bolt holes were cleand and chased with tap.<br />New washers were used under head bolts.<br />Head is perfectly flat, checked it many times in many directions.<br />Block is flat, the cylinders seem to be @ .005 lower that the rest of the deck of the block, I believe this has to do with the fire ring around the cylinder and would not cause to leak to the outside.<br />Bolts were tightened following the right sequence and in 5 steps up to the 270 inch pounds.<br /><br />So, I took the head back off, checked again for flatness - dead on.<br />Gasket was not crushed nearly as much as the old one that was taken off. New gasket .054 thick at the fire ring. Old gasket .040. They are not the same manufacturer of gasket so that may not be eaxcty the same, but seems to point to not being tight enough.<br /><br />The only area where it think I have made a mistake is that I put anti-seize on the head bolt threads. This may have given me inaccurate torque readings.<br /><br />What do any of you use on the thread of your head bolts???? I always used 30w engine oil or Moly lube on a ll the automotive engines that I have built. <br /><br />Also. do any of you use anything like abrush on sealer? We always used "super 300" on our high peformace v-8 automotive engine when we would have hed gasket issues.<br /><br />Any thoughts we be greatly appreciated.<br /><br />On a good note, engine fired right up. Checked compression, 110 and 112, but engine was only just warmed slightly.
