So I ordered my lifters from Speed Inc and the part # on my invoice is 12499225 thats the # for LS7 Lifters. The part number on the box the lifters came in and the # on ea individule lifter box is 17122490. I was about to have the new motor buttoned up tonight but then discovered this!! Its going in my LS1 383 I'm building that will be spinning to about 7200 or so, cant afford pne of those catastrpohic lifter failure disasters! Anyone have any info?

 

Part number 12499225 is for a set of 16 lifters. The individual lifter part number is 17122490.

 

OK> Heres what I have discovered from SDPARTS.com

17122490-L92 Hydraulic Roller Two-Stage Valve Lifter

"The valve lifters have inner and outer bodies, which normally
operate as a single unit. When the engine controller determines
cylinder deactivation conditions are optimal, the outer body moves
independently of the inner body on the disabled cylinders’ lifters.
The outer body moves in conjunction with camshaft actuation, but
the inner body does not move, holding the pushrod in place. This
prevents the pushrod from actuating the valve, thereby halting the
combustion process. Solenoids in the engine lifter valley operate
to deliver high-pressure oil to the switching lifters, activating a
release pin to separate the inner and outer bodies. Oil circulation
and pressure do not vary, regardless of the engine’s operational
mode. Lifter design and pushrod length are the same for every
cylinder, but camshaft lobe profiles differ for cylinders
designated to be deactivated.

 

But why are they coming up as the L92 lifter for the Dsiplacement on demand engines???? Something isnt adding up here...

 

You just gave the explaination of how DOD/AFM lifters work. Those are DOD lifters the way you describe them.

 

Thats the description it gives when I run the 17122490 part # on Scoggin-Dickey, yet my search on here ppl were saying its the # for an individule LS7 lifter. Why would it be coming up different now, need to know if the numbers were recently revised or what...

 

It's the correct lifter. That's the part number for singles....the 12499225 is the part number GM gave the kit of 16 lifters. Their website saying it's an L92/AFM lifter is a mistake. Do a quick search for the 17122490 part number and you'll get a ton of results on which lifter that is.

 

That 17122490 is a Delco short # HL124 also, GM is using this lifter to fit all GM's that have roller lifters. I think the only thing different is that they have started packaging a lifter that appears to be a little more heavy duty where the roller is. If you compare one of the new lifters to an old one say a stock one out of a 2001 you will see the difference in the lifter body where the roller tip is.

 

Actually they look the same as the lifters out of my 98Z and out of my 2000, both had stock lifters....no visual difference, must all be internal

 

FYI, LS1, LS2 and LS7 lifters are actually all the same.

 

non-active fuel management
ls1, ls2, ls3, ls4, ls6, ls7, ls9, lsa, lq4, lq9, l76, l26, l36, l32 l67 and others

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