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PostPosted: April 14, 2017, 7:18 am 
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need an intake manifold for a y block, it needs to be the bigger pattern for the carb mount. I was unaware there were 2 different ones.

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PostPosted: April 14, 2017, 8:50 am 
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The casting number you are looking for is ECZ-9425-B.

If you need it in a hurry, there is always 1 or 2 on eBay, but the price is getting to a point that an aftermarket aluminum intake is really the way to go.

If you have time, they can still be found at a fairly reasonable price.

Another option is to use the 1956 ECZ-9425-A manifold with an adapter. It has smaller ports and is generally not as good a design as the '57 on manifold but for most people, it does the job perfectly. It should support a little over 210hp as is and maybe 250-300hp with some port work. With an adapter, this will probably cost less than half of the B intake.

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Last edited by charliemccraney on April 14, 2017, 1:14 pm, edited 1 time in total.

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PostPosted: April 14, 2017, 1:08 pm 
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What Charlie said above.

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PostPosted: April 14, 2017, 10:09 pm 
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http://forums.y-blocksforever.com/Topic129780.aspx

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PostPosted: April 15, 2017, 6:10 am 
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Thanks. I think I found another intake. I did not know there was a difference in them.

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PostPosted: April 15, 2017, 4:44 pm 
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Let me know if you don't find one. I left one with the guy I bought the boatload of Y-blocks from. Charlie, do you know if I can use two adapters on the Edelbrock 2-4's manifold to run a couple of FiTech throttle bodies?
TIA,
Paul

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PostPosted: April 15, 2017, 5:24 pm 
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You can use two adapters. However, since the carb spacing for all Y-Block 2x4 carburetors was designed for use with Tea pot carbs, most modern carburetors have to be turned sideways in order to fit. If the FITech throttle body is one of those designed to resemble a carb, then they will probably have to be sideways. That will complicate linkage and other things.

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PostPosted: April 15, 2017, 5:30 pm 
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Thanks, if the transverse carbs cleared; I believe the FiTechs will. It would likely make more sense to just get a correct after-market manifold.
Paul

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PostPosted: April 17, 2017, 6:34 am 
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One thing to keep in mind with y-block manifolds is that there are big and small port heads. The 312 heads have the big ports and will work with the larger flange manifold. The other common y-blocks (2239,272 and 292) have slightly smaller port heads and you want the smaller flange manifold to have the ports align. The manifolds will all bolt up and seal, but they will flow better when the ports match. That's the reason why Edelbrock has both the 553 and 573 tri-power manifolds.


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PostPosted: April 17, 2017, 8:55 am 
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That is incorrect. With few exceptions, there is no 312 head. The few that actually did only come only on 312s have ports the same size as the rest, and could be quite rare and very valuable. A head that came on a 312 usually came on other displacements as well. The break down on port size is by year. 1954 have the smallest. 1955-1956 are in the middle. 1957 and later are biggest.

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318 Y-block (292 +.070 bore, +.170 stroke), FMS T5-Z w/Mustang 10.5" diaphragm clutch.


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