many including myself have had trouble with the silicone bead tearing as the bolts are torqued... try a cheap set of Mr Garbage paper gaskets
watch the thickness, according to Summit
the 215's are .125" thick (1/8")
the 214's are .0625" thick (1/16")
http://www.network54.com/Forum/215649/thread/1343480476/351-C+PARTSthere'll be phantoms, there'll be fires on the road... and the white man dancing