
Then I figured once you modify/custom build the section to suit the Holden head, then the head will limit things anyway. So I thought about what makes the head so crap compared to others and realised (yeah I know- Derr!) the ports limit things, they just can't flow big numbers.
That's when I thought about the turbo lads using 'steam pipe' bends for various things. Me thinking more experimental than practical- I wondered about using something like the steam pipe to replace the intake and exhaust port-to-chamber sections?
My 'idea' is to remove the face of the head with the ports, and grind out the ports completely and weld in the steam pipe sections (90deg bend up from the valve seat and a straight piece to the manifold surface if needed) and re-weld on the valve guides etc. and weld a plate across the lot with the port holes, bolts/threads etc. to fill in the side again. This would give a true circle shape from the valve seat to the port which could be shaped accordingly to match the manifolds. The ports could be arranged intakes up high and exhaust low to give a bit more room for piping, and a straighter inlet path.
The other option may be to do both sides of the head and make it a cross-flow but I don't know how that would work with the pushrods?
DISREGARD COST & DIFFICULTY! I know it's not practical, I'm thinking about the THEORY of this working, NOT whether it should be done or another alternative.
What I'm wondering is- would a true circle shape and even bend in the port work performance-wise or would this actually cause problems re: airflow. IF done, would it be purely for crazy airflow only eg. turbo and stupidly high boost/revs or MIGHT this work for a street engine?
Could this (in theory only) be an improvement?