2014 6.2 bit the dust

CamGTP · January 30, 2020

1 hour ago, 2018GMC said:

Was there a bad batch of springs?

I’ve seen info on this forum about keepers coming out and some bad head castings.

Guess we know why 2016+ models only have 60k powertrain warranty.

my 2018 just turned 10k miles. I’ll probably hit the 5 year mark before 60k miles.

I believe the spring change came in late 2015. I've only really seen this issue and pictures of damage on 2014-2015 trucks.

i82much · January 31, 2020

does the 6.2 have an aggressive cam profile compared to the other OEM cams?

also, i don’t know much about DOD/AFM, but any chance it affects how much oil gets to the top end to cool those valve springs?

CamGTP · January 31, 2020

No, the 6.2 is still very mild. It's just a larger displacement engine and most of the power comes from that.

The AFM/DoD doesn't change how the oil reaches the rockers/valve springs. Oil is still sent up the pushrods to the top like any other LS engine.

i82much · January 31, 2020

7 minutes ago, CamGTP said:

No, the 6.2 is still very mild. It's just a larger displacement engine and most of the power comes from that.

The AFM/DoD doesn't change how the oil reaches the rockers/valve springs. Oil is still sent up the pushrods to the top like any other LS engine.

ok, thanks. i’ve heard of hot rod engines breaking exhaust springs because of lack of oil to the top end, but sounds like that is unlikely here.

swathdiver · January 31, 2020

Sorry to see this and the destruction it inflicted on your wallet!

In three years of perusing these forums, it seems that the 6.2s of both generations are prone to this happening far more often than the 5.3 motors. Was never a fan of beehive springs, always liked the doubles and in my Buicks, if one broke it would not kiss the piston. On the Gen IVs, it's usually the #8 cylinder on an L92 (2007-2008).

JONBLARC7 · January 31, 2020

18 hours ago, Snowcamo said:

How you liking the cam/ tune?

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love the cam and the remote tune went really smooth. Atomic Performance and fabrication killed it, I never waited more than 12 for an updated tune.

It was my first cam swap so it was a learning experience. The main problem I ran into is, if you buy a cam with a 32% fuel lobe. You need to measure for the lash cap, which isn't that hard. The problem I had is TSP says you need a comp cams lash cap. But after failing two different HPFP pumps after a week or two of driving I started to question them and they insisted I had the right lash cap.

Then I found a thread on the corvette forum about how you need to measured for the right lash cap because TSP was wrong on there 6.2 engines. So I followed their instructions and it came out the with the comp cams lash cap I was .018 thousands over and was bottoming out the HPFP. I put the LS7 lash cap on which gave me .002 of tolerance. And it's been great for the last 5000 miles

The cam is great and I didn't lose any low end. Now it pulls hard all the way to my 6200 shift point. It also holds gears better pulling my 24 foot wakeboat too.

Snowcamo · January 31, 2020

love the cam and the remote tune went really smooth. Atomic Performance and fabrication killed it, I never waited more than 12 for an updated tune.

It was my first cam swap so it was a learning experience. The main problem I ran into is, if you buy a cam with a 32% fuel lobe. You need to measure for the lash cap, which isn't that hard. The problem I had is TSP says you need a comp cams lash cap. But after failing two different HPFP pumps after a week or two of driving I started to question them and they insisted I had the right lash cap.

Then I found a thread on the corvette forum about how you need to measured for the right lash cap because TSP was wrong on there 6.2 engines. So I followed their instructions and it came out the with the comp cams lash cap I was .018 thousands over and was bottoming out the HPFP. I put the LS7 lash cap on which gave me .002 of tolerance. And it's been great for the last 5000 miles

The cam is great and I didn't lose any low end. Now it pulls hard all the way to my 6200 shift point. It also holds gears better pulling my 24 foot wakeboat too.

Very good info! Thanks alot man!

Now for that I shoulda got a prius question lol... What kinda mpg are you getting? I saw a youtuber stating 20+ mpg

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JONBLARC7 · January 31, 2020

Well my tires and wheels are really heavy, like 115 pounds a piece for 22x12 and 33" mud tires. So don't take mine as what a truck with stock tires would get. But cruising down the hwy I get 18 to 19 mpg after the cam and around 14.5 in the city. I lost maybe 1 mpg after i installed the cam. BUT i think my right foot has more to do with it and the extra power.

Snowcamo · January 31, 2020

Well my tires and wheels are really heavy, like 115 pounds a piece for 22x12 and 33" mud tires. So don't take mine as what a truck with stock tires would get. But cruising down the hwy I get 18 to 19 mpg after the cam and around 14.5 in the city. I lost maybe 1 mpg after i installed the cam. BUT i think my right foot has more to do with it and the extra power.

Heck man that's pretty good. Thanks a lot man. Doesn't have a bit of a lope at idle?

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JONBLARC7 · January 31, 2020

Right now I have stock CATs and stock exhaust manifolds on it. Along with the mild magnaflow 12909 that I had on my last 2008 6.2 with headers and loved the way it sounded.

I say all that to say with the stock cat and exhaust manifold and mild muffler it's not real noticeable. I can here it but I know it's there. Now after I got it together I ran it for 30 mins or so without the stock muffler hooked up and it sounded just like you would think a cammed 6.2 would sound. But it would be to loud for my wife and 4 year old. And I couldn't imagine pulling the boat that way.

But I'll have headers and not cats on here real soon and it should sound nasty once it all comes together.

Snowcamo · January 31, 2020

Nice! I bet that puts down some decent power compared to the stock cam. Headers will most deff make a difference. Likely a good bit more with another tune.

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JONBLARC7 · January 31, 2020

28 minutes ago, Snowcamo said:

Nice! I bet that puts down some decent power compared to the stock cam. Headers will most deff make a difference. Likely a good bit more with another tune.

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Yea I can't wait. The plan was to do full bolt on's then cam then boost. But that lifter had a mind of it's on.

I got a wideband ready to go on the truck now but I'll just wait until the end of March when I get the headers to add the wideband into the Y pipe. Then I'll redo the whole tune with the added headers and CAI. Then will see how this cammed 6.2 with bolt-on's and E85 does.

If you haven't done E85 do it. You can feel the difference. I added the sensor for 65 bucks and just enable the stock table in the tune myself since I have HP tuners and you could feel the power it picked up.

Snowcamo · January 31, 2020

Yea I can't wait. The plan was to do full bolt on's then cam then boost. But that lifter had a mind of it's on.

I got a wideband ready to go on the truck now but I'll just wait until the end of March when I get the headers to add the wideband into the Y pipe. Then I'll redo the whole tune with the added headers and CAI. Then will see how this cammed 6.2 with bolt-on's and E85 does.

If you haven't done E85 do it. You can feel the difference. I added the sensor for 65 bucks and just enable the stock table in the tune myself since I have HP tuners and you could feel the power it picked up.

Thats interesting. Im in luck as my truck came with the e85 gas cap. I may just give it a shot and see how it goes. Sounds like it really isn't bad at all. But dyno time [emoji38]

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