I will be swapping to a L98 350 out of a 91 Z28 shortly.. i have done some searches but i didnt get everything i need since everyones post is specific to what they need. I want to make sure i get everything i need. I do know i will need a caprice cop car chip to get the car up and moving.. as well as 65# injectors or 61# injectors. my question is what other little stuff will i need to complete this swap TBI wise i am pretty set with the engine swap itself and the required gaskets and all. Any help would be appreciated this will be my first swap and all advice is welcome.What do you guys think of that vafpr that you can get from gmpartsdirect???

Also i have a weiend stealth intake sitting around but it is made for pre-87 heads. how hard is it for me to elogate the center two bolt holes.. Any of you local guys know how to do this? You think a machine shop would be able to do it for me??
thanks all help is welcome and advice
Shawn

 

There should be a sticky that covers the 305 to 350 TBI swap. Anyways, I'm pretty sure it's mainly the chip, injectors and knock sensor. But I'd definitely get my hands on a Walbro fuel pump, and a wide-band O2 sensor while I was at it.

It's not that hard at all. But if it's you're first time though, have a machine shop do it. The last thing you want is to ruin you're intake. Unless you have a 'spare' lying around that you can practice on...?

 

thanks man.. must of been a brain fart forgot to check the sticky's...

so opinions people what do you think a l98 motor will do with tbi on top... and the before mentioned combo...

Shawn

 

ive got a chip u can borrow for a little bit, i passed smog with it in, so im guessing its tuned somewhat correctly... if you need any help man, LET ME KNOW!!! im bored!!

U also need, a 350 knock sensor (GM# 10456288), 350 knock module (GM# 16128261)... ive seen some guys running the VAFPR, but ive also heard it makes tuning IMPOSSIBLE... its not that hard to do the bolt holes, bill (azvolfan) and James (90_ws6_Formula) did the reverse of that to fit a newer intake on older heads.

 

you should be making a little less than what the TPI stock says... im guessing arond 230ish hp and 320ish tq...

more than me for the moment, but less in a month or so..

 

350 knock sensor?? isnt the knock sensor in the block? and my block wasnt taken apart so it should still be there.. maybe i am stupid..

Shawn

talk to me on aim Shawnrs914

 

No no, there actually isn't a sticky for this swap, I was just implying that there should be one.... as this topic is one of the more common.

 

well make this one a sticky... i listed part numbers already... ive done this swap so if anyone has any questions, shoot me a line

 

if you are taking the block out of a 91z28 then it has a 350 TPI knock sensor, i dont think the TPI and TBI sensor are the same.

 

no i thought the knock sensor was located internally on the block.. i'll go back to the guy i bought the engine from and try to get his..

Shawn

 

The knock sensor is threaded and screws into the side of the block on the passenger side. I think the late model TPI knock sensors were different, I think not a separate ESC module.

Don't bother getting it fromt he guy, just buy a knock sensor and ESC module from a Caprice 350 TBI or something similar.

 

do they go bad or something?? its not like this guy is a ***** he is actually really cool??

Shawn

 

They don't go bad, they just have to match the displacement (mainly bore size). What i'm saying is that his engine is a TPI engine and you're going to make it a TBI engine, so use a TBI sensor. A 350 TBI sensor is what you want.

 

well i just made things a little harder.. i just bought a zz4 cam to put in as well.. i am pretty sure i am staying tbi with gas prices...

Shawn