Life is like a box of chocolates....L9h engine

[rdezs]

L92's, L9H, L94... And everything else with VVT.... You have that groove in the camshaft to send oil to the actuator. I've always looked at it and see it as putting the load from the camshaft on about 30% less area of the bearing. Compound that with much of the oil that's headed to that bearing goes up and through the camshaft instead.... So by design that overworked bearing receives less oil than the rest of them. Lol, that's just my perception of it anyway.

The non-VVT motors don't take out the number two cam bearing it seems.

 

[ckeister]

So now that this engine is suspect of being a Frankenstein how do I ID this cam? If it’s been changed or different from the factory installed, I don’t want to have to deal with tuning issues.

 

[rdezs]

Little blurry when zooming in. Can you make out all the numbers?

 

[rdezs]

.... It does look to be a GM from that square on it.

 

[rdezs]

The number you're looking for.... for an oem camshaft should be 12711967

 

[solli5pack]

Not sure if it helps but this is what the back of a 12689035 GM genuine cam looks like. Its a mild cam that I used when doing my AFM delete 2 yrs ago.

 

[solli5pack]

And here's the AFM cam I took out. They both have that QR code looking square.

 

[solli5pack]

For clarity I have a 10 Suburban with a 5.3

 

[ckeister]

Little blurry when zooming in. Can you make out all the numbers?

I'll take a closer look but IDK wh it has that 8 stamped in it. Someone did that and its covering 2 of the oem stamps.

 

[ckeister]

The number you're looking for.... for an oem camshaft should be 12711967

Yeah its definately not that......

 

[ckeister]

And here's the AFM cam I took out. They both have that QR code looking square.
View attachment 459578

Yeah the number looks more like that one that why I dont think this has the right cam in it

 

[solli5pack]

Do all brand cams come with that square on it?

 

[ckeister]

Do all brand cams come with that square on it?

As far as I know but im just learning the LS platform

 

[rdezs]

I would take it into a GM parts counter.... That will be your best bet to identify it if it is a GM camshaft.

 

[rdezs]

Do all brand cams come with that square on it?

I've only seen it on GM camshafts. That doesn't mean it's the right cam for the application. Really needs to be identified

 

[ckeister]

That doesn't mean it's the right cam for the application. Really needs to be identified

Yeah what a nightmare that would have been if I had installed it and its not the right cam. That would have been the absolute last thing I would have thought of.

 

[solli5pack]

Someone should be able to identify it with the numbers engraved on the end......

 

[Tonyrodz]

We have a GM parts guy on TYF. Maybe he can help identify it-- @915_Tahoe.

 

[01FormulaTA]

So now that this engine is suspect of being a Frankenstein how do I ID this cam? If it’s been changed or different from the factory installed, I don’t want to have to deal with tuning issues.

The part number for that cam is 12617373....it's a factory GM L9H cam, it has identical specs to the L92 cam, you will not need a tune with that cam

 

[rdezs]

Excellent, hopefully the cam is in good shape?