EB casting pinto head myths

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Originally posted by Timw

This subject came up the other day and I clarified a few myths that have been circulating for a long time and from time to time.

After sectioning both the EB head and a standard head no major differences where found in the ports on both inlet and exhaust or the shape of combustion chamber.

Sectioning of the heads did reveal some differences but could be put down to tolerances in the casting procedure.

Minor cosmetic changes where found between the heads but flow testing of the heads before they were sectioned did not reveal any major differences in flow.

Yes the EB heads and blocks originated from a casting manufacturer in Germany.


I still have the sectioned heads when I dig them out I shall post some pictures. Both heads where cracked in the usual places.

Anyone that has any further info please add to this thread.

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How many heads did you do?

I agree to a point. When you find a good standard cast head and a good EB cast head they are equal to one another.

You can sift through a number of standard heads and find one equally as clean and good in the casting as an EB cast head.

The difference is that 9/10 EB cast heads have a good casting with no core shift an a slightly better short side radius and slightly taller inlet port (usually 2-3 degrees)

To get the same in a standard cast head usually means picking through 20-30 heads at least.

I also agree about the cracking, they will both crack in the same spots.

Bottom line is that regardless of what cast head you start with it means picking the one with less imperfections, less core shift and the best short side radius and to be practical the EB casting is better THAN MOST standard castings.

Woz

Wozzah, thanks for the info, the two heads that were sectioned were from a mate's engine reconditioning business when he was doing the final cleanup before selling the business. How many had he and I done, lost count of standard heads both types, had done a fair sample of EB heads and standard heads for race, rally customers over the years. This was back in the eighties.