The Edelbrock TES headers have unequally tuned runners for the left and right banks, they were designed to work with the carb'd Edelbrock Performer manifold.
Not sure how a TBI motor would react to use of the headers only. They are not a bolt-on fit in a Trooper, anyway. Jim Paget had a set of these headers cut-up and rewelded to fit his Troop. But these were strictly a one-off deal.
Calmini has a prototype set made up, but could not garner enough interest to make it worth their while to make a production run.
The HT 3.4 Goodwrench motor cam would probably make a good torquer cam for a 2.8. It certainly will fit. I put a set of Comp Cams 1.6:1 roller rockers on my old 2.8 and they jazzed up the midrange and top end quite a bit, lots easier than a cam change. If your valve cover gaskets are leaky, it's a good excuse to pull them, install the rockers and change out gaskets.
The 4.3 TBI or Holley Big-Bore works fine on a 2.8, but for best effect you need a larger exhaust and free-breathing intake system to go along with.
For my money, I'd first do the exhaust mods (2-1/4" including cat, 2-1/2" if you're going to swap in a 3.4 in the future); then the roller rockers; last the TBI.
You won't need to make any mods to the 2.8 ECM as it adjusts just fine. In fact, the 2.8 ECM works fine on a 3.4, too, as long as you're running a larger-bore TBI or 4.3 injectors in the 2.8 TBI.
There's a ton of performance tips at this site:
http://forums.s-series.org/viewforum.php?f=14
Also check out this Power Tips article at the Outdoor Wire:
http://www.4x4wire.com/tech/60degreeV6/
Another Outdoor Wire link you may be interested in:
http://www.4x4wire.com/forums/showflat. ... Post123022
Holley Big-Bore:
http://www.off-road.com/isuzu/womb_tbi.html
Anyhow, that should keep you busy for a while!!!!!!! :wink:
Not sure how a TBI motor would react to use of the headers only. They are not a bolt-on fit in a Trooper, anyway. Jim Paget had a set of these headers cut-up and rewelded to fit his Troop. But these were strictly a one-off deal.
Calmini has a prototype set made up, but could not garner enough interest to make it worth their while to make a production run.
The HT 3.4 Goodwrench motor cam would probably make a good torquer cam for a 2.8. It certainly will fit. I put a set of Comp Cams 1.6:1 roller rockers on my old 2.8 and they jazzed up the midrange and top end quite a bit, lots easier than a cam change. If your valve cover gaskets are leaky, it's a good excuse to pull them, install the rockers and change out gaskets.
The 4.3 TBI or Holley Big-Bore works fine on a 2.8, but for best effect you need a larger exhaust and free-breathing intake system to go along with.
For my money, I'd first do the exhaust mods (2-1/4" including cat, 2-1/2" if you're going to swap in a 3.4 in the future); then the roller rockers; last the TBI.
You won't need to make any mods to the 2.8 ECM as it adjusts just fine. In fact, the 2.8 ECM works fine on a 3.4, too, as long as you're running a larger-bore TBI or 4.3 injectors in the 2.8 TBI.
There's a ton of performance tips at this site:
http://forums.s-series.org/viewforum.php?f=14
Also check out this Power Tips article at the Outdoor Wire:
http://www.4x4wire.com/tech/60degreeV6/
Another Outdoor Wire link you may be interested in:
http://www.4x4wire.com/forums/showflat. ... Post123022
Holley Big-Bore:
http://www.off-road.com/isuzu/womb_tbi.html
Anyhow, that should keep you busy for a while!!!!!!! :wink:
