need help.
i have had my 351 2v heads done up for gas,with stainless steel seats etc.i replaced lifters also.apart from that everything is stock standard.i cleaned top of pistons which had very little build up on them.all new gaskets were fitted although there was some confusion with the head gaskets as they were marked "front" where in actual fact one had to be the reverse,so i've been told (?).once i'd assemble the top end i still had rocker noises on the passenger side only and noticed i wasn't getting the full amount of oil pressure.the pressure would rise to 40 psi but after running for about 10 minutes it would drop back to 20 psi and remain there.with a few more revs it slowly went back to 40 psi but it would drop back again.prior to doing the heads i had no oil pressure problems,the pump seems to be working,if it wasn't i don't think i'd be getting any pressure.i've flushed the block with oil just in case the pump had picked up any gunk,this changed nothing.i've let the engine run for 15 - 20 minutes to give the lifters time to pump up but i'm now at a stalemate as to where i've gone wrong.the only thing i can think of is the head gasket being installed the wrong way round,but if that was the case,would the engine run as long as i had it before noticing any problems,or would that even have anything to do with the oil pressure.
your advise or ideas would be greatly appreciated,
thanks
i have had my 351 2v heads done up for gas,with stainless steel seats etc.i replaced lifters also.apart from that everything is stock standard.i cleaned top of pistons which had very little build up on them.all new gaskets were fitted although there was some confusion with the head gaskets as they were marked "front" where in actual fact one had to be the reverse,so i've been told (?).once i'd assemble the top end i still had rocker noises on the passenger side only and noticed i wasn't getting the full amount of oil pressure.the pressure would rise to 40 psi but after running for about 10 minutes it would drop back to 20 psi and remain there.with a few more revs it slowly went back to 40 psi but it would drop back again.prior to doing the heads i had no oil pressure problems,the pump seems to be working,if it wasn't i don't think i'd be getting any pressure.i've flushed the block with oil just in case the pump had picked up any gunk,this changed nothing.i've let the engine run for 15 - 20 minutes to give the lifters time to pump up but i'm now at a stalemate as to where i've gone wrong.the only thing i can think of is the head gasket being installed the wrong way round,but if that was the case,would the engine run as long as i had it before noticing any problems,or would that even have anything to do with the oil pressure.
your advise or ideas would be greatly appreciated,
thanks