360 LA installing Promaxx Aluminum heads

Ottmundr said
Which promaxx heads are these? I'm looking at ordering up a bare set of the CNC Shocker 185's with the 63cc chamber size. After tax, over two grand, kicking myself for not ordering them up last year.

These are the 171's/63cc, fully assembled.

I ordered them 04/2021, $1400 and change shipped.