I swear by marvel mystery oil.get 2 bottles and put 1 in gas tank other in crankcase.quiets lifters and injectors instantly

 

I'm a little bit terrified putting anything in the crankcase, even this has me petrified !

 

Relax just don’t put anything in the crankcase that you aren’t supposed and you’ll be fine. If you do put some seafoam, MMO, etc just don’t run the hell out of it and don’t leave it in there for an extended period of time.
I’m really curious to hear your motor, can you take a video when you’re up to op temp and post it? Go watch my video on YT and tell me if yours sound like mine did.

 

I used MMO with every oil change in the Lycoming engine in my airplane. Did what it was supposed to do (kept valves from sticking). That was mixed with a straight 50 weight aviation oil. I tried it in the wife's Avalanche several years ago and the oil came out like thin jelly at the next oil change. Maybe they've changed the formulation since then and it mixes fine with synthetic multi weight oils. It didn't back then.

 

If youre only driving it occasionally thats the issue
If you run ir reguarly and it bugs you switch to dino oil quiets them right up
I never run solvents in oil, not good for lubricating...oils have enough cleaners in them

 

I have solved low oil pressure and noisy lifter problems on several 5.3's (with DOD lifters) by simply installing an ACDelco Gold Ultraguard Oil Filter - UPF48R. You can do the research on it yourself, but they are made differently than the cheaper GM Filters and they do quiet lifters that are noisy due to oil flow problems. It won't fix a lifter that has already failed and admittingly, it seems almost too simple of a solution compared to the nuclear bomb approach of tearing the engine down, but its cheap and easy to try, You can swap filters without draining your oil pan if you want to.

 

I tossed my factory lifters when I took my ls3 out.

Get Johnson 2110's or 2116's if you want the link bar. Best hydraulic lifter out there period. Hold records on LS hydraulic cam, on viper v10 hydraulic cam etc, but are still quieter than stock. And there are a few ls's that make over 2000hp 9k rpm with just a 2116. I have bought both, have a set of 2110's to go back in the stock ls3 down the road. They make a 2126 which has axle oiling, and a "race" extra low travel version of the 2110 and the 2116.

Johnsons are also run in the copo Camaro, 2110's (the reduced travel version). They run it with the plastic tray, but keep in mind copo guys rebuild all the time, so they replace that plastic thing often. But they run the 2110 well over 8k rpm.

It's just not a comparison. If you get the standard travel 2110 or 2116 you'll get a bit of extra travel and that gives you some wiggle room for pushrod length. If you are willing to spend the time to get the pushrods exact, then get the reduced travel race versions. The 2126 is badass, and if I were doing it again I would grab them instead.

ISKY solid roller lifters are just a Johnson with bushing and no spring really. I like needle bearings personally over bushing. And I don't think you lose very much power at all with a nice hydraulic like Johnson over solid roller. It basically is a solid roller with a little hydraulic travel instead of having lash.

 

Lsx engines sound exactly like a sewing machine when cold....Drive it....love it. If its quiet warm you're good imo...To my ears even when warm I wouldn't call them quiet...injectors are noisy too.......You can hypochondriac a metric **** ton of dollars on these cars.I also highly doubt internals are dirty especially when you've done a sample check....




Good luck and enjoy your car...