What are the options for valve spinrgs for the stock iron L98 heads? I understand that they are a 1.25" diameter spring. I DO NOT want to pull the heads and machine the seats, but I am going to replace the valve seals and add 1.6 rockers, and figured it would be a good idea to replace the springs. The cam will remain stock, for now...

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87 Formula 350 13.94@96.67
98 Z28 1LE 13.15@107.59
1LE Owners Association

 

I'd say you have a couple options. You could stay with GM or go aftermarket. I've seen lots of positive comments about Comp Cams. You could call their tech department and ask them for a recommendation. Several of these companies also will answer tech questions through e-mail inquiry as well.