OST-093: My, My, Mystery

[oldeskewltoy]

(07-26-2022 12:10 PM)banpei Wrote:  I see you stamped OST-096 over 63. Does this mean you worked on this head before? Or was the 63 stamped by someone else?

far more innocent... I mis-stamped it.

(07-25-2022 06:34 PM)oldeskewltoy Wrote:  If you watch Garage 4AGE's videos you may have seen the earlier head makes a bit more power. This is likely because at the bowls the earlier heads have a better shape as the bowl turns to the valve...



... BUT there is more room in the floor of the later head (arrows).

I've come to the conclusion that the later heads were partially designed to better accommodate Formula Atlantic engine builders....... but that's another story...

(from soon to be posted "Catching up thread")..... This is a later head now fitted with oversize seats for Atlantic valves.




more to come....

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(07-25-2022 06:34 PM)oldeskewltoy Wrote:  The Mystery here is the head I'm working for OST-093. It appears that it is a mixed head, with some newer features, and some older features......




more to come......

So... what makes it a mixed head?

Please note that the front of the head is cast as a later type - albeit it isn't drilled/tapped




and yet the intake ports have the earlier shape




more to come......