Burtz high compressinon head 6.5:1

[Bruce of MN]

The maximum advance that the Burtz head is happy with will be interesting. I assume it is a bit less than the 6:1 likes.

[Johan Ottosen]

Originally Posted by Bruce of MN

The maximum advance that the Burtz head is happy with will be interesting. I assume it is a bit less than the 6:1 likes.

I have no idea how many degrees, as I have no means of testing it. But it feels that the engine runs better advancing furthest at higher speeds. I advance 1/3 at city speeds and 2/3 at 70-80 kph

[Johan Ottosen]

Originally Posted by alexiskai

I'm 95% sure there have been no direct dyno comparisons of those two.

It would be fun to see the difference on paper. By the way, love your videos!

[Bruce of MN]

This thread addresses spark advance for high compression heads.

https://www.fordbarn.com/forum/showt...+cutting+wheel

[C1Nelson]

I talked to Shaun at FS Ignitions. He is telling me that the Burtz 6.5-1 head should be run at about 18-20 degrees.

[C1Nelson]

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Does anybody know the torque specs on the Burtz head? I would think same as the snyder or original heads?

UPDATE: I found in the Burtz Builder Guide torque is started from the back of the motor and work forward. Loosen 1/8 turn then torque to 55 lbs.

[Bob Bidonde]

Ford has the coolant circulation in the block & cylinder head wrong for all Model "A" & "B" head designs. Coolant does not flow aft as it enters the block, it takes the shortest route to the water pump.

[Terry Burtz, Calif]

Originally Posted by Bob Bidonde

Ford has the coolant circulation in the block & cylinder head wrong for all Model "A" & "B" head designs. Coolant does not flow aft as it enters the block, it takes the shortest route to the water pump.

This thread is about the new 6.5 head which corrected the original flow path problem. Cylinders 3 & 4 are no longer bypassed.

The coolant passage holes in the bottom of the new 6.5 head have been designed to divert more water to the rear of the cylinder block.

The large oval hole in the center has been eliminated, the large hole between intake ports 1 & 2 has been reduced, and the holes on the side opposite the valves have been made smaller.

When Dennis Kliesen drove his 1929 Tudor with the "New Engine" equipped with the new 6.5 head across the southwest deserts from Southern CA to Kerrville, TX for the MAFCA National Meet in 110+ degree F heat, the new head was the same temperature from back to front when measured with an infrared thermometer gun.

Please study the attached picture and note the changes made to the coolant passage holes.

[Synchro909]

I like it - Nice work, Terry.

[Flathead]

Does anybody know why Ford changed from not having that center hole in the early motors to adding it and continuing it through the end of production?

[alexiskai]

Originally Posted by Flathead

Does anybody know why Ford changed from not having that center hole in the early motors to adding it and continuing it through the end of production?

It was always there, but it was changed from a circle to an oval during production. The change occurred on the block side in Mar. '28. It's noted as a change on the head side in the Oct. '29 service bulletins. The given reason is to reduce overheating.