I have knocking on top of the motor we've put oil in it and nothing works what could it be

Oh yea, lifters can be replaced , best if you replace cam an lifters together ! Loud knocking is not usually associated with lifters , they usually make a ticking noise ! Knocking noise is most usually in the bottom of the motor , main or rod bearings . most of the time rod bearings !

could be a cracked or broken flex plate

if its a top end knock its a rod ...if the knock sounds like its coming from the bottom it might be your oil pump

sounds like lower end bearing damage (connecting rod) when oil level drops at interstate speed a connecting rod bearing will seize very quickly thus causing the bearing to spin in the rod and enlarge clearance . that is the knocking sound you here .

Yes, I agree. Overhaul, or new engine time. Loud knocking indicates your crankshaft bearings are toast-it won't be long before a piston rod goes through the block, or the engine siezes up. Overhauling an engine with a bad knocking means a complete teardown and rebuild-very time-consuming, labor intensive, and very, very expensive. You might want to consider a used replacement engine with low miles as a cheaper alternative. Good luck.

Hello
Has the engine been run low on oil? Does the knocking get louder as the engine warms up? Have you had a automotive technician listen to this noise? Pistons don't really knock, the bearings in the engine called the crankshaft and piston connecting rod bearings do make a loud knocking noise, if that is the case the engine must be removed from the car and rebuilt.

Hi, this is not the first time i've heard of this problem..I have repaired engines with rod knock, crank bearing knock and piston slap after these treatments. These products can clean so much carbon and varnish from the engine that it brings the real internal problems to the surface. Try using thicker oil

Check the oil immeadiatlly or u might blow up ur motor if it's low on oil fill it to the top crosshatched line on the oil dipstick I suggest a quart of Lucas heavy duty oil stabalizer it will get ride of the knock an any engine wear use every oil change an save ur motor good luck

ok what that means is most likely ur oil pump is not pumping oil to the pistons and i hate to tell u this but even if u change the oil pump once that knocking sounds when u hit the gas and gets louder ur engine is on its way out there is nothing u can do to fix that engine its on its way to car heaven lol. take it to gershow car& recycling and get like 435 dollars for it. sorry to tell u that.

Sounds like you didn't put the pushrods back in the proper locations. There are two different lengths in this engine and you may have one backwards