What's your oil pressure doing when the oil flow stops? If it's a pump problem, the pressure would have to be dropping to virtually zero.

What cam and lifters are you running, and are you sure it's a mechanical lifter cam?
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!