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I agree with Jan, first diagnose boost issue before rebuilding turbo. Even cam timing being retarded will cause your low, delayed boost issue.
Another possible cause for low boost is a pressure leak. I know you said you checked for leaks, but double check the lower intercooler hose carefully for a tear as it passes near the clutch cable area on the tranny case. They rubbed in this area from the factory. You can trim the case of the tranny some to eliminate the problem. See red circle in attachment. It won't effect the strength of the case one bit.
Boost on a 86 GLHS is sloped, but does increase to 12 PSI after around 4000-4500 RPM. Do yourself a favor and replace that terrible LM with a stage II MP, or do some some mods and install a 87 MP stage II LM for Shelby Z. The 87 LM requires an external MAP and two wires switched in red and blue LM connectors. EZ to do. The Whittier plant did the crazy lazy sloped boost curve to try to save the a525 for warranty purposes. Then bragged about it on the window sticker like it was a good thing, and that you should pay extra for it! Performance, economy, and driveability is all enhanced with replacing the neutered LM. The 87 Shelby Z came with the Getrag a555 tranny, so even the stock LM offered a much more aggressive spark and boost curve. The MP stage II offered even better performance.



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