I got a full race manifold not long ago and I'm about to be putting the engine in soon and all I need is a wg. This is the manifold I have:
Full-Race Motorsports

My question is does that manifold use a 44mm wg? The reason why I ask is when I measure the in opening its exactly 40mm and the outside is 50mm. I'm a little bit confused on how do I know what wg do I need.

 

44mm.

 

Thanks just waned to make sure before I spend another $350 on a wg

 

If you look at the flange on a 40mm Tial, you'll figure out immediately why it's not the one you have. It's square with 4 botls. The 44 is common V-band one.