Here goes nothing!

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87National

G-Body Guru
Apr 15, 2009
661
679
93
eastern SD
regarding Gen III vs Gen IV LS motors, be aware that the Active Fuel Management feature is on the IVs. A mechanic guy I know who used to work at the dealership on them mentioned that AFM lifters were always going bad, and those lifters run about $40-50 apiece...on RockAuto. He said you were better off just repacing them with standard LS lifters and then having the ECU re-programmed (I think) to disable the AFM feature.

05-06 were essentially a gen 3 with gen 4 rods and pistols. There was no AFM until 07. The 05-06 are the holy trail for low budget turbo applications.
 
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rancher

Not-quite-so-new-guy
Sep 24, 2017
15
26
3
Blackduck, MN
dyno'd my 81 cutlass a couple of days ago, got 582whp with pump gas and 15 lbs of boost, a real good day.
 

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