| rkennan2010 | -- 08-29-2010 @ 5:06 PM |
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Are the 1938-48 intake manifolds interchangeable with the 1949-53 V8's if not why???
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| supereal | -- 08-30-2010 @ 9:14 AM |
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The later, 8BA, intake manifold will bolt onto the earlier block, but the oil filler is moved to the front, and the manifold requires the later breather pipe, which also is located at the front of the engine. The fuel pump, stand, and push rod is also changed. There is no provision for a vacuum tap, as the later engines draw the vacuum from a port on the carb.
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| rkennan2010 | -- 08-31-2010 @ 2:21 PM |
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Thanks for the info in your opinion is it wise to switch or would you stay with 49 to 53 Thanks Rich
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| 37RAGTOPMAN | -- 08-31-2010 @ 2:31 PM |
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what exactly are you trying to accomplish? what engine do you have, using multi carbs ? this would make answering the question just a little easier, my 3 cents, 37RAGTOPMAN an KEEP ON FORDIN,,,,
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| Stroker | -- 08-31-2010 @ 3:32 PM |
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If you have a Ford 8BA or equivalent Merc., I think I'd stay with the later manifold. The later blocks have an internal breather riser pipe in the left front (as viewed from the drivers seat) corner of the valve chest (the cavity in the "vee" under the manifold). This was engineered to vent to the front external breather pipe found on the post 48 manifolds. Switching to a pre-48 manifold presents a rather circuitous path for the crankcase emissions, as they exit the left front corner of the valve chest, and then must travel to the back of the manifold in order to exit through the oil filler, which was really designed as a fresh air intake. The early blocks had a crankcase vent incorporated in the front corner of the oil pan. If you have a post 48 engine, it does not have this feature. So.....in the interest of good crankcase ventilation, combining an early intake with a late engine can essentially eliminate any exhaust path for crankcase emissions. Having said this, If you have a pre-48 block, and want to install a 48 or later manifold, then you have provided TWO paths to get rid of the "bad stuff". Now-a-days, we think of crankcase emissions as something that we recycle back into the intake manifold to be consumed by the engine. Prior to the advent of the PCV valve, crankcase emissions were something we really wanted to simply "get rid of". Sequestering the contents of these "nasty" emissions within the confines of the engine in any case is not a happy thing, as they contain byproducts of combustion, including acids, and water which do not contribute to a happy environment for our precision "innards".
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| supereal | -- 08-31-2010 @ 4:39 PM |
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It is simpler, and less expensive to match the intake with the block. We sometimes mix up years, such as a later cam and "post hole" distributor with an earlier block, etc. Most aftermarket flathead pieces, such as heads, are designed for the 8BA style engines. Much of this is done for cars, such as street rods, where the engine is exposed and appearance is a consideration.
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