I have a olds 455 with block class Fa  and  F5  puts it 72-76 Fa is marine how can I make a sound 450Hp with out all the problems 

...X 2.......Chevy or Ford

I hear you guys and agree and untill I can aford to do a BBC this is what it is for now want it to run this summer and collect BBC parts as I go along  

Nothing wrong with the Olds! It was THE definative jet boat engine back in the day, and many knowledgeable people on here can support that.

450 HP? should be a cake walk, really.

I've posted this no less than 5 or 6 times, but at the risk of beating a dead horse, yes, drainback is the main issue. There are restrictor kits to the top end, special pushrods, etc, etc. (My experience is based on Pontiacs with the same condition.)

The "problem" is the oil system is too good. Pumps too much oil to the top end (Hence the "restrictor kits or fixes")

Not really necessary, IMO. removing all casting flash and adding a large capacity pan/pickup WITH a windage tray should solve most issues. Yeah, we used to smooth the inside of the heads and lifter valley, but that was extreme. the problem is more cavitation of the overly efficient oil pump through frothing of the oil on drainback. The smoothing and streamlining stopped that.
Regardless, in the 5000 rpm range, you'll be fine. It's when you push the issue with hotter cams and make your max power to 5500 or better these things show their ugly head.

450 @ 5000? Easily attainable. Call Tom at JBP or Dave at A&D to find out how.

Ray

For what it will take money wise to get the Olds to make a reliable 450HP, you would be able to build a longblock 454 that will do the same.

IMHO, if you are going to build a BBF or BBC anyway, I would start there, otherwise you will be putting in twice the effort for half of the result..

There is nothing wrong with a properly prepped Olds, the will run long, hard and forever...But you have to start from the beginning on one, meaning not in the middle......
Start with all the parts spread out on a table and hand inspect and critique each area of concern...

Have I ever mentioned I hate doing shit twice?   

GT

Nothing wrong with the Olds! It was THE definative jet boat engine back in the day, and many knowledgeable people on here can support that.

450 HP? should be a cake walk, really.

I've posted this no less than 5 or 6 times, but at the risk of beating a dead horse, yes, drainback is the main issue. There are restrictor kits to the top end, special pushrods, etc, etc. (My experience is based on Pontiacs with the same condition.)

The "problem" is the oil system is too good. Pumps too much oil to the top end (Hence the "restrictor kits or fixes")

Not really necessary, IMO. removing all casting flash and adding a large capacity pan/pickup WITH a windage tray should solve most issues. Yeah, we used to smooth the inside of the heads and lifter valley, but that was extreme. the problem is more cavitation of the overly efficient oil pump through frothing of the oil on drainback. The smoothing and streamlining stopped that.
Regardless, in the 5000 rpm range, you'll be fine. It's when you push the issue with hotter cams and make your max power to 5500 or better these things show their ugly head.

450 @ 5000? Easily attainable. Call Tom at JBP or Dave at A&D to find out how.

Ray

the motor i have is relitively fresh just want to change a few things 

OK hear ya GT ive got all but carb  resticters and cam kit  comp has a kit with roller rockers push rods lifters chain and gears and cam has lift and duration and correct overlap for OTH kits about 450.00any body want to buy my inclosed trailer

Thanks Dave wisdom from the doc is of value 

Ok...here ya go...IMHO...
for a marine "Olds"...which I believe are great engines I suggest:
1. Restrictors for mains/proper oil clearances...thru out.
2.Stock oil pump but Blueprinted./Huge marine pan
3.Isky or Clay cams.
I prefer .0007/10 per  1.000 Journ. dia. oil clear. on the Olds for rods and mains./ cam oil clear..0030/10

Just my opinion.

Yaaa....I have plenty of experience with Olds.....even the diesel ones..never had any trouble.
Build them correctly and they last forever....maintenance free.

I have the foundation but iam going to check those clearances as Dave said   Dave on PB a guy had drilled the back of the heads at the oil return and put fittings in to drain oil back to pan said it worked great seems like cool idea

A guy on PB drilled back of heads at the drain back holes and ran lines back to pan drain hole and said it works great seems pretty cool idea 

Thanks mopartec

your very welcome there Honda1.