Posted by engineoops on March 01, 2016 at 09:06:57 from (107.220.205.68):
In Reply to: 2008 GM 5.3 with AFM posted by jeff nwoh on February 29, 2016 at 08:19:07:
Don't have answer to all your questions , but the lifters are roller lifters and very seldom hurt the camshaft . just put the AFM lifters in daughters 07 GMC AFM , and they were 54.00 each (8 AFM lifters and 8 regular lifters in this engine) . rock auto had the AFM lifters for 22.00 each but we were in a hurry. Problem started when they put 10w30 and Lucas oil stabilizer in the engine and it went haywire .ran bad ,shifted bad and lost 1 lifter . so proper viscosity is important 5w30. with the thick oil the pressure went up to 40 then slowly down to zero .proper oil and it's back to normal . seems there are some fine screen in the AFM solenoids and one under the oil pressure sending unit . I hope someone chimes in to tell if you could put all non AFM lifters in and disable AFM with device or reprogram . some guys disable AFM by removing sensor wire on brake booster or plug in device found on the net , but have not heard if all non AFM lifters can be used . hope this info helps someone . most people just get the lifters replaced and drive on. Eo
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