Ok so i have an 86 friebird with a 305 tpi system. I bought a 350 TBI out of a 91 GMC Sierra. Im gonna put my 305 fuel injection system onto the 350 engine. I need to know wat all i need to do in order to put this 350 engine into my car. Any help would be greatly appreciated. Thank you

 

The 305 might have the old style intake pattern, the 91 should have the newer style. Look at the 4 center bolt angles. Old style has them coming out at a 90* angle to the mounting surface, newer ones is like 70*(?) angle, more vertical.
You should probably start w/ some new injectors, for a 350.
Make sure you get a flywheel w/ that 91 motor, oil pan too.

 

you will need to reprogram the memcal to a 350, $6e mask is the best, 22 #hr injectors from southbayinjectors and keep that 91's flexplate. you can elongate the holes in the intake manifold or get one from a 87-92 tpi. and hope you have a heated garage, its cold in aurora today !!!

 

We wont be starting until friday, me and some buddies will be doing it together so hopefully we can get it done in a couple days. And yes it is heated thankfully. And i knew about the injectors but wats this memcal thing?

 

You also need the 350 knock sensor

 

Jason I thought you car was a 87!!!! That CL add where you bought is said 87. Yep flexplate will be needed.

Guys whats the difference in the knock sensor? Later blocks use different sensor?

 

I thought it was too. However the title says its an 86, and the vin matches that statement so yea. Its ok. its a third gen thats all that matters lol. Later on down the line i might get a 92 firebird lol

 

How much will a flex plate run me??

 

Knock sensors are just microphones looking for a very specific sound. The 305 and 350s, with their different bore sizes, make different sounds.

 

I got cha! I just knew the connector and the part visually looked the same from 305 to 350.

 

Don't worry about the knock sensor now, do the swap & get it running. Easy to change it out later. A knock sensor aint gonna keep from starting up.

 

Why would you not do the knock sensor right off the bat? Just do it and get it over with while you are doing the swap.

 

You don't "need" to do any of that. '86 is MAF, and doesn't really care about the displacement.

The larger injectors are only needed at max demand, and at altitude with a TBI engine, 22's won't be necessary, and the 19's will probably run better, anyway.

'86 is 1-piece rear main seal, like the '91, and the '91 may actually be a 168-tooth and wouldn't work with the '86 starter (not particularly an issue if you have stock exhaust) - just use the starter and flexplate that work together.