ok i have a 89 firebird with a weenie 2.8l in it and i have a 4.3tpi motor in the garage and im thinking about changing it (oh i also have a 700r4 from a 90 van) im wondering what kinda of modifacations i would have to make other then the correct motor mounts.

 

It's basically a V6 to SBC swap with some twists.

You can get more details via

 

sorry about that but before i posted i tried the search and everything game back with no result

 

Hmmm, you're right. Something about the period, I think, that messes with the mind of the search function.

I don't recall the details, but I believe the engine mounts are not the same dimension from bellhousing to mount bosses as the standard SBC. Of course, they're different from the 60 degree and 90 degree V6's, as well. So, some fabrication is required.

If I recall correctly, that is. I've never had a 4.3, so everything is from what I've seen/heard around here.

Exhaust will be 100% custom until you get it to the stock cat location. After that, you can use standard 3rd gen aftermarket stuff.

The good news is the bellhousing is the same pattern as the standard Chevy V8. At least, that's good news to some.

 

Here's a couple of things to try:
Google search
ede's response

 

Moderator note: The originator let me know he's decided not to do this swap, therefore I'm going to lock this thread. I won't delete it so future searchers can find the info.