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

If you could buy the best intake for the Y Block for all out performance, what would you choose?  I have four intakes from Mr. Mummert that I was fortunate to test back to back on the dyno with a serious Y Block engine.  These intakes were not tested in "as cast" condition, but were ported by me for my personal 375 cubic inch Y.  I spent two days at Ted's dyno stressing these intakes to their limit in NA (naturally aspirated) form.  I believe we have just about reached the limits of airflow with the current series of Mummert aluminum heads and intake manifolds.  Anyway, the intakes are the Mummert dual plane, Single plane 4150 carb, Single plane Dominator, and the Tunnel Ram(modified).  This is the engine that I took to EMC in 2018 expecting to have good race gas to compete with, but found they were using 100 octane which resulted in 5 of the 7 Vintage Class engines detonating themselves to death(mine included) and I finished in 2nd place to Jon Kaase.    I have rebuilt the engine with several modifications since the fiasco at EMC.  I did a half fill of the block, honed the cylinders +.001", coated the pistons again, new rings, Mike Jones camshaft, new Trend lifters +.100" to work with the larger camshaft lobes, reworked the heads, intakes, and added electric water pump motor.  Here are the intakes.  Which one do you think made the most torque and or horsepower?  Joe-JDC 

JDC