Let me start off by saying I have searched the Internet and forums for weeks looking for information to help me with my build. I have found lots of useful information but I need a little more help from some people who are more experienced with trucks. I know how my Evo x works inside and out but I am somewhat new to N/A and truck performance.

I have a 1996 Chevy k1500 5.7l vortec completely stock. Last winter the crankshaft broke at 214k miles and I figure why not rebuild it and have some fun.

It will be daily driven in the winter and used for random truck duty/hauling things once in awhile but I would like to have some fun in it too. Currently I have the entire engine torn apart (had to get another block core due to irreparable grinding from the broken crank). And I'm ready to have the block and vortec heads dropped off at the machine shop, and then begin rebuilding. I'll be doing all the work myself except for the machining and tuning of course.

Here is what I have planned with the goal of 350-400hp.

1. Bore block .030 from a 350 to a 355.
2. Vortec heads machined, valve job, and possibly ported if needed.
3. Go from stock dished dual relief pistons to flat top single relief pistons sized to the new bore.
4. Comp cams custom specced hydraulic roller camshaft
5. Upgrade from stock single valve springs to comp cams beehive dual springs.
6. All new timing, gaskets, arp head studs, bolts, nuts etc.
7. Standard bolt-ons (headers, full dual exhaust, intake, plugs & wires etc)

Doing research I ran into other SBC 5.7 builds basically using this setup to achieve around 400hp. Where I need the most help is with the tuning/fuel system. Or any other advice that may help me with this build .

Does anyone know if the 96 k1500 stock fuel system can support that power range? If not what would I need to upgrade to make it work? Can/will it need to be tuned? Or would I be better off swapping to a carburator?

Any and all help/input is greatly appreciated, if this is not the correct section to post this, please inform me where it would be more appropriate to post it. Thanks!

 

Carburetor will open up a whole other bunch of problems. Easiser to get a Marine intake and convert. If you were going by gross HP in say HotRod magazine the stock L31 is already 300-310 hp at the flywheel. 380-400 gross HP is the upper limit of the stock fuel injection even at 70 psi. The other problem with making 400 HP from a L31 is the 430-450 ft/lbs of torque will quickly cook your 4L60E .

 

You could do what I did with my blazer, got rid of the stock TBI when I put in a 350 GMPP crate motor rated at 330 hp and put FAST EZ EFI, self tuning and takes a few hours to put in. You could probably use your stock fuel lines with a couple of adapters and a seperate regulator with a walbro 255 pump. Then all youd need is a carb intake. Then you wouldnt have to worry about tuning at all