The Ford Barn - View Single Post - What Y-Block camshafts work well with automatic transmissions?

dmsfrr · 08-20-2021, 01:47 PM

If you have them, the original power brakes and vacuum operated windshield wipers depend on intake manifold vacuum for their operation. 19 to 20 inches of vacuum at idle is normal. (more is better, if possible)

Aftermarket camshafts will usually reduce manifold vacuum so chose carefully.
Especially if you drive mountains in rainy weather. ???

What carburetor and distributor are on the engine? The originals are '56 only, vacuum matched to each other and may figure into your question & answers.

The shifting pressures of a FordOMatic are mechanically controlled by the throttle linkage position.

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08-20-2021, 01:47 PM	#3
dmsfrr Senior Member Join Date: Aug 2012 Location: Abq, NM Posts: 3,607	Re: What Y-Block camshafts work well with automatic transmissions? If you have them, the original power brakes and vacuum operated windshield wipers depend on intake manifold vacuum for their operation. 19 to 20 inches of vacuum at idle is normal. (more is better, if possible) Aftermarket camshafts will usually reduce manifold vacuum so chose carefully. Especially if you drive mountains in rainy weather. ??? What carburetor and distributor are on the engine? The originals are '56 only, vacuum matched to each other and may figure into your question & answers. The shifting pressures of a FordOMatic are mechanically controlled by the throttle linkage position. . Last edited by dmsfrr; 08-20-2021 at 10:49 PM.