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#1
01-17-2022, 06:07 PM
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TH400 info??
Can't recall for sure if the original vacuum modulators for '71 TH400 equipped Firebirds were the adjustable design or not (threaded screw in the outer end). Pontiac MPC's appear to only show Service Replacement types, which were adjustable.
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#2
01-17-2022, 07:37 PM
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Some black can mods were adjustable, I just do not know when they started
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#3
01-19-2022, 04:43 PM
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Stock in 69 , 70, and 71 that I have pulled, original, were Not adjustable.
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