I have a set of 289 hipo heads that I wont be using. They appear to be standard, no porting or polishing. Date codes are 4G23 and 4H3. $1800.00 plus shipping located in northern California. Would be willing to work out a trade with date coded 5H hipo heads. email: tscarano1@hotmail.com. I have more pictures if needed, I could only post 4.