67 twin turbo dart

Mad Dart said
The motor that was in the car and I took out when I sold it to you had the same problem. The rings didn’t seal correctly on the Dyno. I tried a lot of things like you did and none of it worked. I didn’t have to change any of my gaskets though put a GZ vacuum pump on it. Problem fixed.

Same motor that is now single blow through CSU e85 custom built Carb. Four bowls and four Needle & seats. The vacuum pump is under the driver side blow off valve.

View attachment 1716048506

That's one sick motor. Yeah all the gaskets like yours were good too, just changed the rear main just in case since it was coming more from there. Even had it diamond honed at QMP. Just one of those things that happen. Can't wait to hear what your motor runs.