Engine Blue Printing - 1275cc A-series - Cylinder Head #2

DISCUSSION:

• To put it bluntly, the last guy to touch this head and did the machining should never be allowed to get near an automotive part or a machine shop again.  I could do better at age 8 when my father started giving me access to the home machine shop.  What comes to mind for the guy's new name... The Butcher of Cylinder Heads.  Well, onto what I discovered.
• Turns out the deck flatness ain't bad.  But take a look at the rocker surface flatness.  Yeah, that's the 0.005" in the first pink rectangle.
• Next take a look at the variation of thickness... 0.0105" is a mile for a machinist.  I have no idea how anyone could be this far off.  Needless to say, the head is wedge shaped inline and across.  And to get it back to reasonable, a fair amount of material will need to removed.  I haven't investigated what this means for compression ratio of valve length, but for a fairly stock motor it will most likely be fine - once re-machined.
• I didn't even bother with the combustion chamber volume (cylinder volume in the spreadsheet) because I think the wedge shape will affect it too much.
• Besides the above issues, this is another on of the good cast iron heads according to Vizard.

SUMMARY:

• Ok cylinder head that should serve a stock motor just fine is the verdict... even if you want to port it and open up the combustion chambers.  But, man... the previous machining.  It hurts thinking about it.

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