I can get a 70'-79' model sbc 350 block from a old van with crank, rods, and pistons for $50 from my friend. I have a 91' LB9 in my GTA right now. Mechanically will my top end (intake, heads) bolt on to the block? Is there a hole for the knock sensor? If it will im of course gonna have it cleaned up and put new bearings, rods, and pistons in it, custonm prom, etc.

 

the two inner bolt holes on a 87+ sbc intake are at a different angle than a 87- sbc.but the intake can be drilled out to make it work.

the hole for the knock sensor is there.it was originaly use as a coolant drain plug for the block.

hope this helps

 

Mechanically/physically you're dealing with most of the same stuff, you'll want a new cam and one thats going to be friendly to efi, also your injectors are going to be a tad small, but the rest is easy, who knows how old my block is.....

 

Thanks for the info. BANDIT can you give me a little more info on the "intake holes" that ill need. If you would send it in a PM.
THanks

 

You might want to use the heads that came with the 350 since they will have bigger ports.

The intake bolts around the EGR port in the head are drilled at different angles. The 87 and newer go straight down into the intake while the older style are at 30 degrees (or something like that).

You will need an adjustable fuel pressure regulator (AFPR) to raise you fuel pressure due to the smaller 305 injectors and a 350 chip for the computer.

If the older heads have big combustion chambers, consider buying aftermarket heads.

If you are going through the short block and replacing the rings and bearings, do a full overhaul instead with new pistons as well. If your 305 is ok, you can take your time and do it right. Replacing an engine in a TPI car is enough of a pain to do once, much less do it twice!!!!!

 

I may be doing the 305 TPI to 350 TPI swap soon too. I may have an engine but I don't know what year it is yet. Where can I get this 350 chip for the computer? Or yet a 350 computer? If I got new injectors would I still need the fuel regulator? What would happen if I ran the engine on the 305 ECM?

Sorry for using your thread man!

 

One thing to remember is that the Federal Clean Air Act states that a motor must be replaced with one out of the same type of vehicle (car, truck, bus..etc) of the same year or newer. That means that you are commiting a federal offense if you swap a 197x truck motor into a 199x car. Most states dont actually run the #s that are stamped on the block, but people have been heavily fined due to these types of swaps.

 

If the motor has had machine work done, kike block decked, teh year of the motor is petty hard for the average Smog guy to find out since some blocks cover many years. Also, I'm not sure that the ruling applies to rebuilt engines..... Better check to be sure!!!

The Computer is the same by vehicle for a 305 or 350 only the EPROM (chip) is different. Their are other differences such as the ESC and EST modules are different as well. Most people, including your dealer will say they are interchangable but they usually aren't. As long as you don't mind getting a check engine light with your favorite babe in the car, go ahead and use a 305 ESC module with a 350.

The injectors are 19# per hour on a 305 and 22# per hour on a Camaro. I think the Vettes had 24# some years.

If you use the 305 injectors with a 350 you need to boost the pressure up to make them pump 22# per hour. You need the 350 chip for the computer to give the right amount of fuel and timing to the engine.

For more information check out the following link:

http://www.fuelinjection.com/ Go to the GM Port Injection link......

Do a search on the web and you can come up with a number of different sources for info....

 

Where i live we dont have inspections and as country as we are around here we prolly never will. Its just a block. No heads

 

I have to bud in and ask a few questions since this pertains to what I'm doin....

I just got this 1968 camraro SS motor from a guy. It was a long block. Now I think it was rebuilt, but I'm not sure. It looks like the pistons are aluminum and somewhat new...I'll get ya part numbers later today...

Heres are my questions

1) The heads are the stock 78cc heads. Now I'm swappin all of my 86 IROC TPI stuff over will te TPI lower intake bolt up? If not what are the mods that need to be done?(havent seen any clearification on this yet)

2) Is that 78cc to much cc's for this set-up?

3) Will milling the head drop the cc's?

4)I'm looking at TPiS's head gasket which raises compression .5 of a point. Good Idea?

5) what sensors have to be changed, or can the 305 sensors all be used?

Mods I expect to do are in the sig. please help me out I wanna drive before snow flys. But I am in no hurry cause I really dont want to deal with this again. TPI is a PITA when it comes to pullin a motor.

 

1: 86 will bolt up fine.
2:Yeah, thats a bit much... average is 64. You could probably use the heads of the old 305 for added compression
3: yes it will, but i dont know how much milling it would take.
4: .5 is a lot. i dont see how it could drop a whole half a point.
5: umm the 350 requires differnent knock sensor, and fuel injectors and something else... cant remember.

TPI is a PITA over all. hehehe.