[Cheesehead]

Brent,
The datasheet of the Edelbrock Performer Heads says: Maximum valve lift is .575". A lift of .574" is very close to this max. No more no less. It made me wonder if that will become a problem in the long run.
The sheet also mentions that the max rpm for these heads is 5500 rpm. That seems a little low to me (thought it would be 6000 rpm), but it is what the sheet says.

Nice to know this cam will fit my engine! Thanks for letting me know.
I wonder what in practice the difference is between a XE284HR and a XE274H.

Have a nice day!