Many mods, still not the results I hoped for!!!

[TylerZ281500]

custom tune all the way

 

[WILFRE]

X2. Got mine done by Justin at Black Bear, he is very reasonably priced and offers lifetime retunes. I would also recommend doing the 411 swap, it is well worth it, that alone would probably wake her up a little bit. Your most limiting factor is the SPFI, it will only handle about 300HP, maybe a little more, but not much. If you've got the cash I would do the Marine intake swap so you can run true MPFI. When you did your eFans did you remove your clutch fan?

Yes, I have Dual Electric Fans, and I did remove the fan clutch... I am going to check on in the marine intake.

 

[VorTecxas]

Yes, I have Dual Electric Fans, and I did remove the fan clutch... I am going to check on in the marine intake.

Just checkin man, I've known guys who put the efans and then leave the clutch fan on for some reason. Marine intake takes a little work, but is well worth it as far as unlimiting your injector selection.

 

[WILFRE]

X2. Got mine done by Justin at Black Bear, he is very reasonably priced and offers lifetime retunes. I would also recommend doing the 411 swap, it is well worth it, that alone would probably wake her up a little bit. Your most limiting factor is the SPFI, it will only handle about 300HP, maybe a little more, but not much. If you've got the cash I would do the Marine intake swap so you can run true MPFI. When you did your eFans did you remove your clutch fan?

where could I find that marine intake?

 

[BadBowtie 98]

http://www.michiganmotorz.com/cast-iron-marine-intake-manifold-2002current-p-486.html

And some info on the swap
http://www.pacificp.com/forum/viewtopic.php?t=317

 

[VorTecxas]

Here's a complete setup on eBay -
http://www.ebay.com/itm/Mercruiser-..._Accessories_Gear&hash=item4abd4de618&vxp=mtr

 

[94Sierra4x4]

Here's a complete setup on eBay -
http://www.ebay.com/itm/Mercruiser-..._Accessories_Gear&hash=item4abd4de618&vxp=mtr

Wow. Didn't realize they were that pricy.

 

[VorTecxas]

Wow. Didn't realize they were that pricy.

That's actually not a bad deal. I've seen bare intakes alone, no wiring, TB, or injectors, for $700+. If you plan on keeping the truck indefinitely then it is a very good investment. I plan on doing this swap on my next 350

 

[94Sierra4x4]

That's actually not a bad deal. I've seen bare intakes alone, no wiring, TB, or injectors, for $700+

While that might not be a bad deal, as I said before, still pricy

 

[SAATR]

One of these:

http://www.ebay.com/itm/Edelbrock-P...Parts_Accessories&hash=item5af20a6dfc&vxp=mtr

plus one of these:

http://www.ebay.com/itm/NEW-LS1-LS6...Parts_Accessories&hash=item20d35085f9&vxp=mtr

and one of these:

http://www.ebay.com/itm/Edelbrock-F...Parts_Accessories&hash=item19dda62a8a&vxp=mtr

some of these (which can be had cheaper if you search around a bit) :

http://www.ebay.com/itm/1-Year-Warr...Parts_Accessories&hash=item3f2409644f&vxp=mtr

Then an injector harness off a truck LS engine and 0411 PCM, new intake tube, fuel line to adapt to the new rails, and a little wiring and retuning and you'll have a great deal more power than you do right now. This for about the same price and effort as getting the marine intake and modding it to work on your truck. Oh, an it's a lot lighter to boot!

In all seriousness, the induction and fueling system is this engine's biggest Achilles heel, along with the 5800 RPM limit of the PCM. Take care of that, and you will see a good deal more power from the setup you have now, to say nothing of adding long tube headers and some proper gears.