Just going to get some quick information up here for you. This will go over the DIFFERENCES between the Gen4 07-14 AFM delete and the Gen5 L83/L86 engine when performing a complete AFM delete, getting rid of AFM Camshaft and Lifters.
The ONLY parts that carry over to the L83/L86 for the mechanical AFM delete are the 16 lifters, and the 4 lifter guides. EVERYTHING else will be different. I'm not going to list all the other parts, head bolts, gaskets, so on, you should look those parts up for your specific vehicle application. The direct injection engine is a lot more complex. You should refer to factory service manual procedures for camshaft replacement, head r&r, so on. The gasoline direct injection fuel system on these engines operates at thousands of PSI, you need to know what you are doing. Local shop I work closely with has deleted a 2015 L83 truck with these parts listed below and everything worked out perfect. Programming is the same $50, go back to the main AFM delete page to purchase programming service.
Lifters - GM Part# 12499225 Your AFM engine will have 8 standard lifters, and 8 AFM lifters. This part# gets you 16 new standard lifters.
Lifter Guides - GM Part # 12595365 These are the plastic guides that keep the lifters from rotating, keeping the roller going correct direction on the cam lobe. These guides are different for AFM lifters, and you will need 4 of these.
CAMSHAFT NOTES: There is not a factory GM camshaft to delete AFM on these engines. You MUST buy a custom camshaft to delete AFM on the L83 and L86 engines. Currently, the ONLY camshaft on the market is for the L83 engine, the L86 camshaft for AFM delete is currently in development and should be available soon.
Brian Tooley Racing sells the camshafts, and talking to them today 8/1/2019 they say the L86 cam should be available in the next week or two! These camshafts will match FACTORY LIFT and DURATION meaning factory drivability, power and performance. There are many performance camshafts for the L83/L86 that will also delete AFM, but these will require further custom tuning beyond just shutting off AFM in the ECM. I DO NOT offer tuning for performance upgraded camshafts. https://www.briantooleyracing.com/btr-gen-v-truck-dod-delete-cam.html AFM delete camshaft for L83 5.3L only, do not use in L86 6.2 or loss of performance will result.
VALLEY COVER OIL TOWERS: Just like the 07-14 Gen4 engines, when doing the AFM mechanical delete, you must BLOCK the oil towers. There is not a factory GM part to accomplish this. The aftermarket DOES have a replacement valley cover, but they are expensive. I suggest using these block off plugs also from Brian Tooley Racing. These steel plugs drive into the oil towers under the factory valley cover. They fit snug to block the oil, and the original valley cover bolts back on and will prevent them from lifting out. The plugs are also threaded in the event you wish to remove them, a small slide hammer can pull them out. https://www.briantooleyracing.com/gen-iv-v-dod-oil-block-offs-set-of-8.html