Classic/Antique Car Repair: intake manifold leak - antifreeze, silicone sealer, lock washers

Question
Rebuilt engine installed in my 1979 corvette about 1,500 miles ago.  Small visiable leak from the two front ( closest to the fan ) intake manifold bolts.  Someone told me to remove them and apply sealent.  I drained the antifreeze, removed the two front intake bolts, applied sealent and replaced them.  The next day, I filled up the antifreeze and the leak appeared to be repaired.  Now, about 400 miles later the leak has reappeared only much worse.  I assume the intake maniford ( an after maket new manifold ) was installed incorrectly.  I don't know, for example if it is important to tighten the bolts in a certain pattern and which bolts require sealent?  Also, I assume the bolts must be tightened to a certain tork.  I could really use your help on this problem

The 1979 corvette was the last year that they had carburators. Also, this new engine has a new water pump, radiator, and new thermostat.  

Answer
HI
 Scott, sorry as I did answer this but it did not go threw
so here goes, first I would take out the bolts and clean them up real good than put a lot of silicone sealer on each one and put them back , start from the center and work out to the front and back and make them snug as far as a toqure I think it is around 35 ft lbs but I would just snug them by hand and than re-tighten them the same way when the engine is hot . Note if the intake is a aluminium one tighetn the same way but use lock washers and be carefull
not to over tighten as it will crack the intake and than it will be a expensive piece of junk as it will be useless . ok be carefull ->> again use enough silicone on the bolts as some go right threw water ports .so do not be afraid to use to much
good luck
roger jm w