I believe there round ports are way underrated as they work very well low down and midrange to 6500 after that the oval port comes on its own but the majority of the time most work is done under 6k so the round port combined with 1300-1400 is a good balance. Is that the thrift port swirly model head?

Some old rallye guys back in the 90s bought several of my round port weber manifolds saying the round port with some work was better for the dirt coming out of corners. No doubt the oval ports are better at flowing more air while round ports maintain good port velocity at most times but oval ports are better suited to over 1400cc pepped up engines and maybe a stroker 1800+cc with modded E15 crank like Lemonhead was building would see the oval port head on its own.

If I was a tig especialist, Id love to hit the water jackets on a round port by going all the way up fill in the roof, lift the port floor base up, weld some 6mm plates for a unitary rocker cover and fill behind it for some very high position big round ports finally some big valves porting and oven curing by specialist.
That would be the ultimate high round port head :)

I have no idea. From memory the head was the late A12 bolt pattern and it was a round port with the H89 combustion chamber.

I haven't even fine tuned the carbs yet and it has no trouble wheel spinning through second gear, provided it gets a good kick start off the back of first gear.

The carbs have been quite impressive too, I haven't seen anyone run these on an A-Series before apart from the very old excel kits offered for the 1000 range. I would recommend them in a heartbeat over the DHLA, DCOE, PHH variants (for street engines).

Havent heard of anyone actually having this motor :O. Whats it out of?

I've got an a14 thrift motor with twin 35dhlb carbs which have a better flowing, closer bore spacing. The motor is just about stock with exhaust and it absolutely hauls ass even more so than my a15 that had twin dcoe 40's.

What sort of power characteristics do the round ports offer and why are they so? Anyone else run a similar setup to me?