i have heard about having to drill out an oil hole for the pto side of this engine, but i dont know where it is. i just installed a set of PSI triple pipes on my 93 xlt 580 and want it to be reliable with this setup. i have read that running the engine between 8400-8700 will cause some bad vibrations in the engine and make the engine blow sooner, but that it will run fine at 9200 rpm. i thought that running heavier weights would be better to be able to use the extra hp and keep the rpms down and still have full shift-out. any help with this is appreciated.