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Automotive Vehicle Repair & Performance Shop
AFM and DFM specialist!
USA Company Located SE SOUTH DAKOTA
Questions & Answers
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What the heck is this for?
What in the heck is this for, if I remember correctly it mounts on the driver side head wit the round part sticking up like its protecting you from the end of the fuel rail when it blows out.
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2018 Silverado 5.3 with failed lifter, not collapsed it seems
Hi. First, thanks for all the video lessons, they have been invaluable to me.
-2018 Silverado 4x4 5.3 L83
-Cyl. 7 misfire
-This happened very quickly, no previous indications of issues-- tapping, rough idle or smoke. Just boom, engine light and rough running, smoke etc. Truck was limped home immediately after and has only been started to test if tune-up resolved misfire and then to park in garage. Well, possible previous indications (in hindsight) of difficulties with transition from V4 to V8 that I had attributed to transmission issues, as the result was a kind of lurching, stutter-start type increase in speed that felt more like the tranny in the wrong gear for what I wanted or something worse.
-Oh, zero compression cyl.7
-Very back valve (intake?) barely moves during manual turn over and I can manually compress the lifter instead of the valve with a pry bar.
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Crazed Performance Repair
Sep 28, 2024
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You have somewhat of an understanding but I'm glad you're asking questions.
Pull the valley cover first and inspect for roller/cam damage. You should be able to see the lifter on 7 without head removal.
If it appears good proceed with pulling the head.
To check the plastic trays, grab the AFM lifters while they are sitting in the tray and try to rotate them. If you can rotate them with very little effort the tray is no good. If it takes a decent bit of effort and it isn't rotating, move on to the next one. Don't overly force it. You can cause damage to the plastic.
Might want to replace all AFM lifters. However there is a way to take them apart for inspection if you like. They can be purchased at most parts store or online parts places. They will be individually purchased though and not a set. Just avoid cheap knock offs.
You definitely need head bolts, they are stretched during tq process. One time use only.
Pushrod upgrade at $14 is base price for a single pushrod. The full set of 16 is much more. Though the more you buy the cheaper per single one gets. I do this to promote buying a full set. While having the option to only do the problem pushrod.
Only do the VLOM plug and cutting of gaskets. Don't get the oil galley/tower plugs. If you block those oil towers with AFM lifters the main oil galley under the lifters will eventually fill up and pressurize the oil tower leading to lifter failure.
If I missed something let me know.
VVT vs Eliminating VVT
What are the pros and cons for keeping VVT and eliminating it?
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ryan.schalk
May 09, 2023
Thanks. I’m currently building a Gen V 6.2 for my Tahoe to swap out the 5.3. Any things I should be aware of while swapping besides tuning. VLOM mod was done on the 5.3. Not sure if I’m going to buy a new valley plate or just use mine. Might use Camaro pistons. Not sure yet. Have you used any of TSP’s cams? I would like to keep it on 87 but give it a more aggressive sound with stock exhaust plus increased power.
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That's used during in assembly line for lifting the engine I believe. I toss it to make the ground install at back of head easier.