Installing a Camshaft 4.9

I have knocking from my cam shaft. That what I'm inspecting. It started after oil change. I put the right oil 10w-30 about since October 2017. I heard YouTube channel video shows a cam lobe rounded off making the cam chewing up lifters by stuck valve. But I don't see stuck valves when I took the side lifters plate off while engine was running. But sure seems moving ok. I have noticed when I droven it it only knocks when the engine ravs up to shift another gear. Normal drive I don't hear it. Only when shift or siting rav it up in park. I took it apart and took out all the lifters all where good accept one was chewed up from the bottom. So I changed one of those lifters. Same sound so I took that one back out change one more time. The truck doesn't knock during idle but if I rise the idle over 2500 or less it sounds awfull. I bought the truck last year in September 16 2017 for 3000 and doesn't even leak a drop of any fuilds of any sort even as today aswell. It ran good for 3 weeks then it suddenly over heated. Blown head gasket.😫 So I bought a head gasket master kit. Install it. October the knocking sound started happening while I was on the freeway. I didn't know until I pull in autozone parking lot planning to buy a repair kit for gas tank.. another issue?. Dame😫👀..... Well anyway just wanted to know if could change the cam and wanted to know if I have to change the camshaft bearings or is it recommended to do so. My truck is a 1995 Ford f150 XLT single Cab 8 ft bed. Everything works excellent inside and out, nice interior. It really nice truck 3 owner including me orginal factory warranty papers and books . I just wanted to fix it up for to go to work and to grocery store without having to spend alot of money and worry about breaking down some country side. The truck has been sitting in my driveway since November 2017. 156,677 miles on it. it haven't driven since. The sound seems to coming from next to camshaft in the back of the bottom of litter plat cover that sits on the side of the driver side of the engine. There only one long cover there. I thought of take one of the was bad and running the truck to see if the nose would go away just to see if I'm right about the camshaft and one lifter make the noise lifter slaming against the camshaft. Of course I'm not going to drive it like that. Any suggestions would really appreciate it


1995 f150 XLT 4.9L Big Six



@Warriorking1980
@Warriorking1980
Installation of of camshaft and bearings
Thanks for your support
Sorry I don't have any mechanical gauge expect factory gauges which it says normal in oil pressure and temperature in the dashboard. Oil pressure is showing in the middle. I have noticed sometimes when I drive it for approximately 30 miles from mt sterling KY to Lexington KY , Im at a traffic light it goes up and down while sitting about 40 psi 25 it just a guess I pushed the gas so the engine wouldn't starve from oil. After waiting at stop light it goes to normal range in the middle while I'm driving. It seems be doing this only drive for awhile far as oil pressure. I assume because of the oil is warmed up it loses thickness. The truck seems to run fine no lost of power, except the knocking sound. I have noticed that it does drink alot of gas on the high way since the knocking sound started. Factory Warranty papers saying 20 miles a gallon on the high way and 15 in city. Lol I wish is was like that now. I getting about 10 on highway and about 15 city. So drive it on the country road it seems running best at 45 to 55 mph anything higher severely drinks alot of gas. It takes a half a tank to go 30 miles and maybe a 8th or alittle more of a tank. I just wondered if if need to change bearings with the camshaft and if it recommended