Will the factory fuel system support a GM 383 and supercharger, I can live with that. My daily driver runs 13.7 with a 2.4 sixty foot weighing in at 6000 pounds, I want the tahoe to be close. Well at least fun to drive!!!!!

 

I know it will with a 350 as they sold tons of Centrifugal kits for them. So the new 383's with the better heads and cam might be ok if you keep the RPM down a touch.

I know the new Rams uses added injectors to fuel the added boost, and I beleive the TBI Chevys were the same. Call around to get your answers before you go off and order to many parts. The Hi-Po TBI trucks have been known to use the 454 tbi, and now they have a Edelbrock Port fuel injection retro fit kit that should do wonders compared to a TBI.

 

Basically yes, but since you are using 8 conventionally placed injectors, you have to lengthen the stock injector harness. No biggie wiring wise.

peace
Hog

 

Big negative on that 1.
The highest naturally aspirated ported Vortec head/LT4 hotcam 383 dyno number using the stock injection was 330rwhp.

the stock intake uses 19 pph poppets which simply wont support more cubes AND a blower.

To do this properly you would need a marine intake or some other intake manifold that allows conventional and replaceable larger injectors.

Post #9 shows teh stock Vortec 305/350 intake and amrien intake side by side. It laso pictures the stock poppets and teh GM MPFI conversion spider that uses Multec 2 injectors. Unfortunatley the Multec 2's still flow 19 pph.

https://www.performancetrucks.net/fo...ghlight=marine

peace
Hog

 

Yes, I had some input on those swaps.

the newer 4.3 blocks are actually cast differently in the timing cover area to accept the 58x reluctor.

peace
Hog

 

I checked out the marine intake and I shall be using one. What the deal with the crank trigger wheel, will i be able the use the 350 trigger wheel with the 434 bottom end if i use the whole 350 front timing cover?

 

Very interesting build. I have a 99 2 door Tahoe and I wanted to do the exact same thing. I ran into a couple of questions and I just kind of let it go. I also realized that much power in that vehicle just wasn't necessary for me, overkill IMO. I originally wanted to do something like this:

http://airflowresearch.com/articles/article039/A-P1.htm

I wanted to use the vortec heads and port them to get back a little flow to make the HP more respectable but also keeping the TQ nice and fat! I found a article in CC about porting the heads they did a before and after and the results were great. It picked up 17 lb/ft of peak torque,[ 464 vs 481 @ 4,400 rpms] and carried a ton more at higher rpms vs. falling flat. Same thing with the HP too and it gained another 29 HP from peak to peak[436 @5,500 vs 464 @5,700]. The HP gains were 30-45 more at the rpms of 5,500 and above. So there is a good amount there to gain with a little work. (motor was a .060 over 350, 10:1, 750 cfm Demon, 230/235 lunati)


Isn't there an issue with the old 400 block and the cranks that they used and the reluctor wheel? I never understood exacly what the issue is. I guess now they have a new block and you can use it's crank to solve this problem. Again I don't know all of the little peices that go with it to make it work, but I'm sure it's possible. I read about it in here:

http://www.pacificp.com/forum/viewto...t=vortec+heads

Then I came across this engine and I think it would be a great compromise. Plus the crank/reluctor issue shouldn't be a problem, I think. Awesome torque curve on that thing. They make a two others with bigger cams that make more HP if you look at all his items. But you're just robbing from below 2500 RPMS and 95% of my driving is at or below this range. Then you get into fueling issues, tranny issues, rear dif and transfercase issues........ You're spending a lot of money that is going to make many more expensive issues down the road. Here is the motor:

http://cgi.ebay.com/ebaymotors/350-C...5788QQtcZphoto

Then I got thinking if I'm already spending "X" amount for a motor, how much power will that buy. I found this engine builder. The motor is along the same lines of reliability and power. I haven't found a better deal around than this. Throw a carb on it and have a blast! But again all that power and many things are going to snap like twigs.

http://cgi.ebay.com/ebaymotors/454-4...Q5fAccessories

In the end I decided that if my 350 ever does give out the best bang for the buck is to throw in a 3.8 crank. Find somebody to work the vortec heads to breathe better. Throw in a good cam and headders and be done. Put together right with a 230's cam you should easily be around 470-480 fwhp/fwtq. Which will more than max out the stock poppet injectors.

Sorry for the novel, but I love Vortec motors and will build one some day for my Tahoe. Good luck and please keep us posted!!!