knocking noise
 

knocking noise comming from bottom end of motor
what could this be 454 motor

The sound of a rebuild knocking on your door.

But seriously, knocking is never good. Probably bearings going out.

Consistent or intermittent knock????
At all rpms or at idle/low rpms????

Internal exhaust flappers will sound just like an engine knock at idle/low rpm.

more like a clunking sounds to be comming from the bottom of motor at ldil more than high rs

and oil pressure will drop to about 5 psi when warm.

no oil preasure stayes between 35 and 40

Cut open the oil filter and see if there is metal inside.
You probably spun a bearing.

Put your hand on the exhaust hose near the transom and see if you feel the knock there. If you do, its probably just the internal flappers. Once when I installed a set of Corsa tips, I about chit because of the sound they make.

If its not the internal flappers, then its probably a rod bearing or wrist pin.

need a good shop in ft myers to rebuild motor without getting taken and what should it cost total rebuild

somebody must know a good engine builder in ft myers

What engine do you have? Are you pulling and installing the engine yourself?

If you have a base 300hp 454 just go with a reman, even it is if a mag I would also consider a reman. Switch out your stuff and core the old. Many people on this site (except one lol) have had good luck with Eagle Engines.

If you are doing the swap yourself start a thread, many people on this site would be happy to guide you through it.

How many hours on the engine, any idea what caused the failure?

Fixx
 

how about tampa area,,nelson compition engine..727-321-5756..ask for chris..

http://www.nelsoncompetition.com/