I can't believe how old this post is.......
Anyway......There are a few variations but the numbers on the front bolt boss
better be 19, 20, 21 to be hipo 289.
Contrary to popular belief, the 289HP heads are not the only SBF heads to have
cast-in pockets for the springs. The C6FE also does. Definitely not a production
piece but cast-in pockets non-the-less. They were technically referred to as
289HD by the foundry folks.
Here's a photo that separates the BS from fact.....
As the drill sergeant said, "I taught you everything you know. I didn't teach you everything I know."
"Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so."
- Douglas Adams