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Florida_Phil (4/7/2020)

Ted. Why were stacked ports abandoned?

I can only guess at the reasons for the Argentina Ford engineers to convert the intake ports from stacked (Fase I) to being evenly spaced across the length of the head (Fase II). At the top of my list would be to get the two center exhaust valves away from each other. That would promote a more even distribution of heat in the cylinder head. It’s difficult to say if exhaust manifold life would be improved by evenly spacing the exhaust ports but add that to the list.

Without a Fase II cylinder head to look at, it’s hard to determine from the pictures if there was a combustion chamber shape and head gasket change that eliminated the decks being part of the combustion chamber. If the head gasket became round to fit the cylinder bore, then that would be a positive. I don’t see any advantage with a firing order change but it could also be an underlying reason for the cylinder head change.

There could have potentially been some negative advertising about the stacked ports by competing car manufacturers and rather than just replacing the Ford Y with another engine, it was more cost effective to simply redesign the heads. And it could have been that the Argentine engineers at Ford just wanted something different that they could claim as their own.

Lorena, Texas (South of Waco)

Author	Message
DryLakesRacer	Posted 5 Years Ago
Supercharged Group: Forum Members Last Active: Last Year Posts: 1.7K, Visits: 340.0K	Thinking about it since they were cast a head with just different port arrangement keeping the shaft rocker system that makes sense. It wasn’t retrofitting a newer head. 56 Vic, B'Ville 200 MPH Club Member, So Cal.
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Ted	Posted 5 Years Ago
Co-Administrator Group: Administrators Last Active: 2 Weeks Ago Posts: 7.4K, Visits: 205.0K	Here are some pics of the Fase I and Fase II cylinder heads. Lorena, Texas (South of Waco)
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Florida_Phil	Posted 5 Years Ago
Supercharged Group: Forum Members Last Active: 2 Years Ago Posts: 1.2K, Visits: 285.6K	Ted. Why were stacked ports abandoned?
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ian57tbird	Posted 5 Years Ago
Supercharged Group: Forum Members Last Active: 5 days ago Posts: 495, Visits: 21.3K	Looks like Windsor intakes and exhausts would bolt straight on.
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Ted	Posted 5 Years Ago
Co-Administrator Group: Administrators Last Active: 2 Weeks Ago Posts: 7.4K, Visits: 205.0K	Florida_Phil (4/7/2020) Ted. Why were stacked ports abandoned? I can only guess at the reasons for the Argentina Ford engineers to convert the intake ports from stacked (Fase I) to being evenly spaced across the length of the head (Fase II). At the top of my list would be to get the two center exhaust valves away from each other. That would promote a more even distribution of heat in the cylinder head. It’s difficult to say if exhaust manifold life would be improved by evenly spacing the exhaust ports but add that to the list. Without a Fase II cylinder head to look at, it’s hard to determine from the pictures if there was a combustion chamber shape and head gasket change that eliminated the decks being part of the combustion chamber. If the head gasket became round to fit the cylinder bore, then that would be a positive. I don’t see any advantage with a firing order change but it could also be an underlying reason for the cylinder head change. There could have potentially been some negative advertising about the stacked ports by competing car manufacturers and rather than just replacing the Ford Y with another engine, it was more cost effective to simply redesign the heads. And it could have been that the Argentine engineers at Ford just wanted something different that they could claim as their own. Lorena, Texas (South of Waco)
	Reply Quote

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