KUNAGUERO66

Ima go to the Long Beach Swapmeet on suinday and was wondering how to determine if the manifold is stock or an aftermarket one particularly a tpis big mouth? as for the runners i could kinda distinguish them cause i want the accel/tpis runners and they are huge compared to the stock ones, but a lil tip on those would also be great.

Viprklr

iTrader: (5)

There are measurements on here somewhere regarding the runner hole diameters. Take your calipers with you to the meet.

Now, if you're looking for a Bigmouth it'll say TPiS Bigmouth on it.

Kevin91Z

iTrader: (1)

I'm probably too late on this, but its very simple to tell.

The aftermarket manifold will say "Edelbrock" or "Accel" or "TPIS" on it. The stock GM manifold will say "GM" on it with the engine firing order.