Noop. I got these heads in October, I think it was, fresh from 440S. Glad to hear this is not prevelant. Going with the Lunati 703 this time. Been running the 702 in a 383 and loved it - well-rounded performance, street manners, great vacuum, all of that. Saw 6400rpm a few times. The 703 in the 432 I'm thinking will come about the same on idle and performance, but with vacuum dropping a couple ". Should be great fun though. Looks like I'm indoors for a few weekends with family time. Cheers.