got the 1.75" pipe to mock up the 38mm wastegate. Looks like the diameter on the bottom of the SPA manifold if 1.75" anyway so a larger wastegate doesn't look like it would help unless I want to cut up the manifold. Looks like I can get everything right where I want it. Waiting on a gasket to fit up the turbo so I can have it in place while I fabricate the wastegate pipe to know if the oil drain will be in the way of the wastegate.


69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.