Ls1 valvesprings for stock magnum heads

rumblefish360 said

Longer valve useage???????

Behaive springs come in assorted sizes as well.
Retainers as well. They can change a few things around.

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Agree. best thing to do is to put +.100 long 11/32 sbc stem valve into them and get into the 1.725 range. Then you can implement +/-.050 locks and or shims.