245cc port, it's their biggest 23* low port head.
I forget the min csa, think it's around 2.8" - 2.9"
Is that the reason for the big jump in min CSA from the 235cc to the 245cc heads?
OP got a screamin' deal on a really nice short block set up for 23° heads. A 23° top end is way cheaper than 18° or 15° and doesn't give up all that much power at 388 inches unless the RPMs are way up there, so what's the big deal?OP
If you're going to be spending some good dollars on a 23 deg top end, I'd first price up building a 4.125" bore 18 deg motor.
You can end up with either the same hp as a 23 deg build with a lower maintenance, cheaper to run build or a lot more hp with the same maintenance and cost to run as the 23 deg motor.