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JFM
03-12-2009, 05:22 PM
Are they any good? I have heard bad things about the springs and they would be replaced anyway. I am doing a rebuild and was looking at using them but not sure if it is worth the time and money. What is the max HP guys are getting out of them?

Griff
03-12-2009, 08:48 PM
500HP heads are just GM rectangular port heads.