Quote Originally Posted by Taz View Post
Hello GXP25,

Sorry, I should have been more clear …

Are you saying the 05-06 LS4 engines are actually Gen III variants (24x CKP / 1 CMP) like the early LS2 engines were ?

And that the LS4 engines transitioned to Gen IV variants (58x CKP / 4 CMP) in 2007 as did the later LS2 engines ?
Yes, even though they're officially classified as Gen IV engines. Then again, aren't all Gen IV engines based off of the Gen III design?

"Gen IV" doesn't necessarily equate to 58x/4x.

If so, this would be very helpful to anyone considering an LS4 / 4T65 conversion (especially the Fiero die hards) - potentially allowing the use of a LS1-B PCM - which puts cruise control, Lean Cruise, DBC, and other options “back on the table”.
Have you been to fiero.nl lately? LS4 swaps are all over the place, lol.

I greatly appreciate your input - we were lacking Gen IV information from reliable sources when putting the conversion chart together.


Regards,
Taz
Not a problem at all!