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Old 04-21-2011, 01:58 PM   #1
Redhorse1947
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Default 1949-51 Intake Manifolds
Below are two manifolds. On the left is an 8RT & an 8CM on the right. QUESTION: What is the larger opening (plugged) on the 8RT used for? This is not present on the 8CM but the 8CM does have a fitting (NOT plugged) on the lower right of the manifold which is not present on the 8RT.

Are BOTH of these fittings for vacuum...when needed?
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File Type: jpg Intake manifold (1).jpg (45.3 KB, 26 views)
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Old 04-21-2011, 02:03 PM   #2
Henry/Kokomo
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Default Re: 1949-51 Intake Manifolds
Since the 8RT was a truck engine, I'd guess the large opening was vacuum for a brake booster. Vacuum assisted hydraulic brakes were fairly common on trucks of that era.
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Old 04-21-2011, 02:28 PM   #3
51 MERC-CT
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Default Re: 1949-51 Intake Manifolds
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Might possibly be something to do with speed governor
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