need help on cooling

[demons9872]

OK i have a 3.2e p4 cpu now i can get it to o/c and stable for about 30 min. then heat starts to mess me up @ 4.2ghz . I want a new hsk that will work with the stock p4 retention clips any suggestions.
3.2.@4.2
Abit is7-e motherboard
2x256mb kingston hyperx pc3000
asus 5900 ultra with vivo 256mb dual 40 gig maxtor 7200 rpm hdd