[rb25det powered S14]

in my opinion, bent valves wouldnt be the problem.. once you bend one, they rest follow quickly because they dont bend for no reason.. normally its piston contact againt the valve.. so the rest would have dont the same thing.. i could be wrong about this but thats how it happened on 2 of my cars.. lol.. i wouldnt be surprised if the piston ring was gapped wrong or it was ovaled out due to cheap products.. i know this sounds like a stupid question but have you checked to make sure your getting spark and fuel? fouled plug?? also if you had a bent valve, you would hear it threw the intake hardcore because as the cylinder tries to compress the gas and air, it would just shoot back threw the head via bent valve..