The intakes are single plane for 4150 style Holley, and single plane with Dominator carb pad.  The intake manifold on the right( in the picture above) is a single plane 4150 that I ported after I got back from the 2019 EMC for testing on the 303Y where it made about 12 extra horsepower.  I wanted to test it on my 375 Y, and I have been waiting on the opportunity.  There is a big difference in horsepower on a well built engine over the dual plane intakes.  There was a 13 hp difference in the 4150 style carbs, and 30 hp difference on the 4150 single plane with the Dominator and super sucker on the 375Y.  With the single plane Dominator and tunnel ram, there was a 35 hp difference on the 375 Y.  

JDC

Very tasty intakes.
what are the differences on the three intakes shown together and how can I get one.
John if your viewing this please send me a PM or email rcphillips20@gmail.com prices and availability 

Check the posts below this where the answers are listed.  Single 4V makes 613 hp.   Joe-JDC

Here's the link.  
SINGLE 4V INTAKE MAKES 613 HORSEPOWER ! (y-blocksforever.com)  


JDC

Very interesting stuff!... So, do we get the answer to JDC's question, as to which combination gave the most H.P & or Torque readings?..  Or is this possibly going to be released in Y-Block Magazine first ?.. 


Paul

Thanks for the in-depth answer. Very thorough.

       A  L  A  N   F  R  A  K  E  S   ~  Tulsa, OK    

These heads are angle milled .125", and when received from JM, the exhaust side was not milled back to the same angle as a stock head causing the header to hit the oil filter and block.  I added the 1/2" spacer to move the header out further, and also give the exhaust port some taper to speed up the exhaust flow into the header.  Ted milled the exhaust side of the head back to the correct angle for me before this rebuild, and I chose to keep the plate there to help the exhaust port.  It was allowed in the Vintage Class at EMC, so I chose to make use of every "trick" to up the horsepower, if possible.  Moving the header away from the sparkplug wires is also a good thing.  Joe-JDC

JDC

What's the purpose of the additional thickness spacer on the headers to the heads

       A  L  A  N   F  R  A  K  E  S   ~  Tulsa, OK    

More pictures of Joe’s Ford Y-Block engine on the dyno.
  

  

  

  

Lorena, Texas (South of Waco)

Here’s the picture of the Mummert dual plane on the engine that was also used in this round of testing.
  

Lorena, Texas (South of Waco)

On the dyno pictures.  Joe-JDC

JDC