Re: need a little help...
 

Go back either to a Manley or Ferrea valve. Low cost valves made overseas tend to be softer. I have checked lower cost valves for hardness in the past, and there is a difference. Quality control for materials and processing is not the same with overseas made valves that are mass produced. They cannot sustain lean conditions and the higher spring pressures used in racing.

Re: need a little help...
 

two years ago we had a ford v6 in the shop,same deal intake tuliped also did the exhaust valve in as well ,found that it had a bad crank sensor caused timing to retard and they ran it hot ,check the timing,maybe the bump in compression was enough to do it in,check the distibutor make sure your pickup is phased with rotor, this will raise combustion temp,whats your ignition set up gmonde

Re: need a little help...
 

I run msd ignition, dist.,6al-2 box, blaster coil. 16 deg. intial, all in at 2750rpm and 32 degrees total.

Re: need a little help...
 

Count your lucky stars the head and stem are still intact!