Well I just pulled off my runners and plenum to re-do the gaskets and I saw these big letters cast into my manifold that say "TPIS Big Mouth." I'm guessing this is aftermarket but it's dumb that the PO put this on and kept the stock runners and everything.

Here's a picture:

 

You're right, that is dumb. But I'll happily send you a stock manifold in exchange, I'll even pay shipping

 

I'll give you money for it LOL

 

Ha nope I think I'll keep it and throw some big runners on when my bank account can handle it

 

You sure the runners aren't TPIS stuff already?

 

Actually, no. How can I tell?

 

Match them up with TPIS.com they might be aftermarket too.
Do you know what stock looks like?

 

put up pics of the runners. Or mesure the opening. They will be about 1.75" if they are the big like AS&M.



See how there's not a "lip" where the runner enters here? Stockers have a lip on the flange.

 

Not really sure what you mean by a lip but here's a pic:


TPIS runners or not?

 

stone stock.

 

Yep! That's the stock runners.

 

I have a stock TPI setup for sale with a set of dent free runners off my 91 Z

 

Damn that's disappointing.

 

Eh, you've got the good base though

 

Have any pics? How much?

 

pm yer email for pics

 

if it's any consolation, the aftermarket base is more expensive than the runners.

e.g. SLP runners are about $330, the Edelbrock TPI base is about $410.