Yes you will need to swap the lifters out for the LS7 lifters (or use the short style already in the engine). Some people just swap the tall lifters out, but since they are cheap for the oem LS7 we recommend replacing all of them. We always have these in stock if you need a set.
You could do it that way! But, using Hp tuners to turn DFM off is still using the failure prone DFM lifters to get slightly more life out of them. Our delete is allowing you to put the "LS7" non DFM style lifter to properly delete the DFM lifters.
Even if the block off plates and LS7 lifters are used, doesn't the ECM still have to be tuned to stop the ECM from commanding the DFM on and off?
Yes you will need to re-tune the engine
Do you have to swap the lifters out after for non-DFM style? Or will the stock ones work for short term.
Yes you will need to swap the lifters out for the LS7 lifters (or use the short style already in the engine). Some people just swap the tall lifters out, but since they are cheap for the oem LS7 we recommend replacing all of them. We always have these in stock if you need a set.
No LocTite on the hardware?
Loctite is always recommended! We did not use any as this is an engine for mock ups only!
Why wouldn't I want to defeat DFM through HP Tuners and simply turn it off? That's what I did for my L83.
You could do it that way! But, using Hp tuners to turn DFM off is still using the failure prone DFM lifters to get slightly more life out of them. Our delete is allowing you to put the "LS7" non DFM style lifter to properly delete the DFM lifters.