toomuchjunk

Can anyone share horror stories of cam choices that were bad decisions in order to help those undecided souls, such as myself, from making costly time and money mistakes? Melling makes an almost identical stock cam for dod afm motors. I am trying to get best MPG but do not want to build a led sled either (Chevy Avalanche pickup).
MEL-MC1390 https://www.summitracing.com/parts/mel-mc1390/overview/year/2008

swathdiver

The Gen III 5.3 L33 camshaft, 12583623 is the same grind as your original without AFM.

toomuchjunk

Thanks swath for recommendation but I like to see specs on cam , I have scoured the internet and can not find them for the cam you have suggested. I have talked to melling about mc1390 cam and surprisingly they told me the single bolt cams they sell they more than likely buy them directly from GM! Looking heavily at GM 12625437 also ---when will all the madness endddddddd .

01FormulaTA

iTrader: (16)

@toomuchjunk

In the future if you need to know stock cam specs go to https://help.summitracing.com and type in the RPO code of the engine you are looking for...in this case I typed in "L33"...this will provide info on the block, rotating assembly, cylinder heads, cam specs, valvetrain, etc...

193/193 .482/.482 116LSA

IMO for your goals you should stick with a factory cam as suggested by swathdiver....as far as I know there is no cam out there that was designed to increase MPG, the factory cams will produce the best MPG over any after market cam out there...

Also, if you are going to lift it and add bigger wheels and tires you should really consider re-gearing the truck to at least a 3.73, but really should go with 4.10's...these trucks are tanks at 6k lbs are already dogs from the factory, literally everything you want to do will kill performance and MPG

swathdiver

That is a smaller camshaft: 191-190 .457-.466 114

Like 01FormulaTA stated, the specs at Summit's database is pretty accurate, being updated by Brian Nutter, a wealth of LS knowledge.

07NBSChevy

My 2007.5 Gen4 LMG 5.3 AFM/DOD cam Specs;

2007.5-2009 (Non-VVT) Engines had 9.9:1 Compression with 0cc Flat Top Pistons
#12593207
193°/193°
0.482 in./0.482 in.
116°

2010-2013/14 (VVT) Engines had 9.6:1 Compression with -3cc Flat Tops Pistons due to Valve Relief Cutouts in Pistons for VVT
#12625436
196°/201°
0.481 in./0.481 in.
116°+2

As far as I am aware, these are the cam specs for the Gen4 5.3 Silverado engines
These specs are off of Summit Racings Database.

toomuchjunk

Thanks for all the people who responded, Swath you got the cam specs spot on! I am not looking to get better mileage just trying to make truck as close to factory specs as I can to prevent any headaches down the road.

crutt

GMNUT

iTrader: (13)

I'm running tsp's non DOD stage 2 low lift truck cam in the wife's tahoe and it's got plenty of pep.

turboal1

Stay away from Comp Cams VVT cams, they suck.