these guys are in your hood and have helped me a bunch

http://sharadon.com/newhemi.htm

FWIW, I run stock retainers on my Manley Drag Pack springs with Manley locks.

I assemble a lot of heads for LS stuff and its all been 7* for the past several years and haven't had a problem. years ago, there were a lot of spring kits with 10* but I never see it any more


Gen 3 power 6.22@110, 9.85@135
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performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs