They are opened up a bit and cleaned up a lot. I don't recall the exact measurements off hand but I think they were essentially gasket matched to this gasket.

(this is my cleaned up head in the photo ready to go to the port shop)

This is what the head on the engine currently looks like. No work done to the ports.


I scaled the pictures best I could and cropped them next to each other to show the difference in the chamber shape. The top head is currently the one on my engine. Basically opened up around the intake valve to unshroud it.


Hard to believe this engine looked like this when I picked it up a few years ago.






Edited by TheSilverBuick (05/26/14 08:36 AM)
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Rebuilding an OHC Pontiac 250 with EFI and a Turbo