Exhaust manifold swap

[Cooose]

So after researching around quite a bit here's what I've decided to do. I thought I would share in case anyone else needs it down the line.

Part # Chva184 - BBC manifolds
Part # 20-0097 - 3" spacer block
Part # 53-2027 - Barr/imdmar Riser with 3.5" OD outlet

This keeps the longer riser putting the water /exhaust mix further from the exhaust flange and keeps a very similar geometry to the original PCM manifold/riser. It also keeps the 3.5" outlet to match the original PCM riser which is NLA.

The total height difference between what I plan to go with and the OEM is ~ 9/16" measured from the center of the manifold flange to the highest point of the riser. If I remember i will post up a picture or two once the new parts come in.

I did also consider looking at the Barr risers but these put the water/exhaust mix closer to the block than OEM and they also come in either the 4" or 3" outlest vs the 3.5" OD.