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Just to ensure, this morning I removed the passenger side exhaust pipe and verified that I did indeed delete the butterfly. I also added a pressure / vacuum gage to the exhaust O2 port to measure back pressure. At idle, it is a fairly constant 1 psi. At 2K RPM, it becomes unstable, and the...

Thanks for the comment. I was looking for some first hand experience with the 383. Are you saying that a pedestrian L-code 2V-383 in a C-body should not be able to reach "normal" vacuum of 20-22 inches at idle? I'm also puzzled at your exhaust temperature observation. 1800+ in the...

Yes, and that's a great first thing to check. The heat riser manifold valve has been deleted via acetylene torch to the butterfly.

I think I DID use the same gearset. That is a great observation. Thank you for the insight. Easy enough to slap a degree wheel on it and verify valve events. I did put a piston stop in it to verify TDC on the damper, and timing marks. But a retarded cam, and then compensating by advancing...

Help. I am working on my 1970 'cuda with the 383 / 4 speed. This has been an on-going problem since the restoration several years ago. The car runs sluggish and hot. I restored it using the original Holley 4bbl, and 906 heads on a standard bore 383. 26 inch radiator, 3.55 gears, Accurate...