[Chevy454]

I¥ve heard from several person¥s about this but some say I¥m gona lose my bearings doing this???

I've personally never done this, but I don't see WHY this would hurt anything. At the very LEAST you're gonna be increasing the oil capacity (albeit slightly), which is a good thing.

The pump is going to be "blueprinted" and an washer is to be installed behind the spring.

Just curious, which pump, and what clearances are you setting up on your engine? Adding pressure and/or volume just eats power, and if it's not needed, then you're just wasting power. If you're not really opening up the clearances, then the stock pump with the regular spring MAY work fine.

the "By pass" in the spinn on filter holder is to bee blocked

I've heard of folks doing this, but I've read you gotta be CAREFUL, because if you spin the motor up very much at all when it's cold you could blow your filter off, or a line, or...?

Q Is my plan wrong?
Is the pump just going to cavitate?
Is the oilflow/pressure to be to low??
If its going to faile, why?

Granted, I'm no "Grumpy Jenkins" when it comes to engines, but I've done a LOT of talking to the Stock/SuperStock & NMCA boys as of late on different oiling issues, and you'd be VERY surprised at what the majority of them run on their cars. To my surprise, the majority run STOCK volume oil pumps (with AT MOST a heavier spring, but not all do that), some run small block pumps, and a lot even run with as little as 2-3 quarts of oil! Granted, they aren't street cars, but if their BBC's can repeatedly live past 8,000 rpms, then they must know a little something. These boys are literally chasing .001's of seconds, and do extensive testing, but their theory is "every little bit helps". Anyway, they feel the majority of oiling problems are attributed to cavitation, versus the traditional thoughts of too little oil capacity or too little volume or pressure.