Lee Willis
Posts: 1991
Joined: 7/27/2005
Status: offline
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Why would you want aftermarket valve springs? If you change out the cam, or go to high ratio rocker arms, then yes, you need new and stronger valve springs (and pushrods), but get that with the cam, all as a kit with retainers and all the parts you need, as a whole and compatible with one another, all from the same manufacturer.
I always liked Crower myself - never have had a problem with them in, oh, maybe 15 built up engines and perhaps 30-40 different cams over many many years. But there are others just as good, I think.
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2007 Aston Martin Vantage Prodrive
Lincoln MKZ "Grandfather car"
''98 Z28 with iron LS 408, NOS, tricks, street driven mid 9s (sold to my youngest son for $1, Aug 28, ''07)
''02 SCd 427 cid ZO6, 704 RWHP, sold Aug. 28, ''07
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Printable Version
LS1 Aftermarket Valve Springs - 
