i just purchased a nice 91 z28 i was thinking of removing the engine and replacing it with a small block 400 carbureted that we had built for our 80 camaro that i no longer have does anyone know of problems i might have doing this swap will the trans still work also its the 700r

 

Unless your 400 makes over 500 hp, you're much better off sticking with TPI.

 

The 400is about 480 hp the motor in it now is stock

 

What are your plans for the Camaro? Usage?

What are the specs of the 400?

 

Mostly a weekend driver every now and then down the track just curious if the 400 would b easy to install since I would have to eliminate the computer and everything thx for ur input

 

Well, depending on the specs of your 400 you may or may not have to eliminate the computer.

With the right cam, you can keep the tpi and will have a great drivable car.

Perhaps consider a cam swap and a stealth ram intake for a great set up.

Or course you could yank out all the EFI stuff for a carb, but that is just going backwards in technology

 

Let's see, "problems" putting a 480 horse carbureted 400 in a car that originally had TPI:

- Not emissions legal
- Will need to regulate fuel pressure down to a carb-friendly 4-7 psi
- Stock TPI pump probably not up to the task of supporting 480 HP
- Will need to figure out some way to turn on the fuel pump if you remove the ECM
- Exhaust inadequate to handle 480 HP - can we assume headers?
- 400 uses an externally balanced 2-piece rear main seal 168-tooth flexplate. Many 168-tooth starters interfere with 3rd gen headers. Mini starter typically solves this problem.
- TH700R-4 not up to the task of handling 480 HP stock. Some upgrades, or a complete rebuild, to be expected.
- Stock stall probably not friendly to a 480 HP 400 SBC.
- Without the input from the EFI system to the ECM, and/or without the ECM, the torque converter clutch won't lock up when cruising. Can be fixed with a simple switch, or one of several kits available.
- Typical carb throttle arm not compatible with the TH700 TV cable. A geometry corrector bracket available for most popular carbs (Holley, Edelbrock).

That's for starters. The rest depends upon the details of the 400.

 

WOW ya shot a big hole in that

 

Thx for ur input were pulling the trans today was going to send it out for the rebuild I was told tht a th400 trans would b better to install in the car what's ur opinion on using tht instead if the 700r

 

Your gonna need steam holes drilled into the heads for a 400. Unless you use the 400 heads and in that case you would have to go carb.

 

Trans, really depends in engine and use.

For a street driven car, th700r4 is way to go.

Th400 will require a cystom crossmember, custom torque arm mount, drivesshaft, different shifter, and you'll be losing overdrive.

 

Sounds like the 700r is gonna b the easiest install the converter lockup kit should b good

 

So, no hopes of keeping the efi?

 

Can the 700r4 hold up to 480 hp if not what do I need to do too it or what is a good 4 speed trans to buy I need to know Bc I'm putting a ls3 in my 91 camaro plz help