Known aspect of the 390 engine I have learned is that the OEM components of the top end are susceptible for quick failure if in case used at high redline and racing use (have seen 30-hour engine top end being found to be almost at catastrophic failure condition ).
Now fixing this not to be an issue (TI retainers, beryllium valve seats, swapping out head bolts to hardened studs) I do wonder if it would be of any help to address the high RPM valve float trough adding a bit of preload to OEM springs via thicker valve spring base seats. I wonder if anyone has any experience on that aspect as so farI have found no alternative valve springs been offered available what wold be a degree harder, but still acceptable for OEM valves.
Now fixing this not to be an issue (TI retainers, beryllium valve seats, swapping out head bolts to hardened studs) I do wonder if it would be of any help to address the high RPM valve float trough adding a bit of preload to OEM springs via thicker valve spring base seats. I wonder if anyone has any experience on that aspect as so farI have found no alternative valve springs been offered available what wold be a degree harder, but still acceptable for OEM valves.