Featured Technical ***August 2025 Banger Meet Thread - Yes, Already***

I’ve got both a Best 509 and 573 head gasket. The 573 was sent with my D4B Head by Dan Price(Dan 4Banger). The only difference I can see is that the 573 has the steam holes. The fire rings appear identical. I would think the 537 could be used with no problem caused by the steam holes not being used.
Oddly enough the head does not have steam holes. The photos show the 537 overlaying the 509.