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Re: TFI ignition upgrade
To the "won't rev over 3.5k" owner. Wouldn't be surprised if you had a crankcase ventilation problem.
Recommend switching the PCV valve to a "Breather cap / PCV valve" It's a breather cap (with wire mesh in cap) plus a pcv valve. Available at Autozone. Fits right on the ol' 258.
Mine works great.
Hope this helps.
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