Revs limited to 3500!

[Wiggles (Paul Wigton)]

As others have stated, ensure the throttles are fully opening, including the secondary throttles.

Then, do the “5-minute Strangleberg fix!”

1969 intake manifold throttle plates

John, The secondary throttle plates cause a proportion (a large proportion at low throttle settings, and progressively less at high throttle settings) of the air/fuel mixture to be diverted along the length of the secondary intake manifold and back, to preheat the mixture in an attempt to reduce emissions. Full details are contained in Section Q of your Service Manual. Removing them improves the responsiveness of the engine, and many of us have done so. How you do this depends on how much effo…