hi im new hear been a lurker for awhile tho and have made due but this issue is driving me nuts. i have a 07.5 silverado 1500 lmg 5.3 i bought with 350k in 2019 i did a dod delete not long after with a crane 1449511 cam cut the cats out bc one was shot and welded pipe in there place and shut of the rear 02s and it ran fine for awhile. about 2 years or so later i was burning alot of oil and the engine just sounded like sheet after awhile so i figured id pull it and rebuild it. i ended up finding a low mile 83k lc9 for $250 that had a stuck lifter i used the heads and the alum. block of the lc9 bought new flat top pistons honed the cylinders real nice put it all back together just rite. the one thing that happen was i got a set of comp 850-16 or so i thought off amazon that was open box new when i first started the rebuilt 5.3 after priming with oil the lifters were so loud i shut it down rite away like wtf ended up firing it up again tried to let it get to operating temp but shut it down again worried it was gonna blow or something it was that bad the third time i fired it up it was quiet but had a obv. misfire and a p0300 you could feel it stutter so i pulled the valve covers and the drivers side rockers didnt get oil all at the same time two in the middle were like 20 seconds after the rest but they all moved up and down like they should i pulled the passenger and fired it up and rounded the front of the truck and immediately ran to shut her down as there was oil being shot 6-7 ft in the air and all over the battery like a fire hose i figured ok bad lifters is my problem. i ordered another set of 850-16 and changed them out realizing the old lifters were def some china junk someone swapped out. lastnight fired it up and id say my misfire is slightly worse ive done a compression test and got 190 on all cylinders smoke tested for vac leak put a gauge on the fuel rail to verify the injectors would hold pressure and fuel pressure itself cleaned the throttle body with crc throttle body cleaner cleaned the maf with crc maf cleaner i did a injector service with a otc cleaner tank also tested resistence of the injectors i did a crank relearn swapped all the coils changed plugs a few time installed a new set of metal fel pro intake gaskets its got a flow master cold air intake on it that i cleaned the air filter wish i still had the stock air box to put back on but dont i checked the cam lobes when changing the lifters out this past weekend just normal wear didnt see anything of concern im at a loss im not sure if this is the rite place to post sry if not ive logged some idol and revs just before and thought id post here to see if anything stands out bc i have and hp tuner but dont really have any idea what exactly im looking at past fuel trims and 02 voltages any help would be very much appreciated comp lifter install.hpl