Hey guys I will be swapping my 89 Iroc 350 TBI to a 6.3 383 stroker specs below. I have a dilemma the stroker is carbed and I current have the TBI system. What is involved in the swap? Should I stay carbed or upgrade to an Holley sniper? What are the pros and cons or issues I may run into.


https://blueprintengines.com/product...tor-bp3830ctc1

 

It would take a lot of tuning to run that engine on TBI, It would also take a higher PSI fuel pump, Vortec style intake.. Doable but much easier and probably better in long run to throw a Holley Sniper or FI-Tech on there and let it pretty much tune itself. I upgraded my TBI system for my engine and it wasn't cheap and still had to get someone to burn me a chip for it and If I had it to do over mine would have a Holley Sniper on it now. Carb would be simple also but fuel injection sure is nice for obvious reasons.

 

Would I need a new fuel pump I've read that the sniper efi needs 60 psi fuel pressure.

 

If your pump is the stock TBI pump yes. Stock TBI pump only puts out 10-15 psi.

 

Walboro 255 worked great on my sniper setup

 

I was thinking of just getting the mater kit I think Holley sends it with the fuel pump. But going from TBI to EFI not sure If I need all that comes in the kit. What was your experience?

 

I considered that kit too but I did not want an external fuel pump. Instead I got a new pickup off rock auto, installed a 255lph pump and modified the pick up and return tube then ran soft lines to the sniper unit. I am glad I went internal pump I would not have enjoyed hearing the pump running under the car all the time.

You can probably get a thirdgen pump upgrade, install it in the stock pickup. Modify the feed line to meet the sniper it should already be 3/8 then run a 3/8 return and modify the pickup to work with it.

 

Thanks I've been doing to much reading on the forum now I'm considering the eddlebrock pro 4 as well.

 

+1 to all of the bolt on fuel injection kits, they work very well and are quite easy to install. You will need a new fuel system. There is really no point in going old school carburetion when fuel injection is so (relatively) cheap. Be wary of knockoff walbro 255's, buy from a good website.

 

Here is my fuel setup. Working good for 6 months now