[Land-speed] Lenco question

[Kirkwood]

I have used GM's Engine Oil Supplement (EOS) for years on all flat tappet
cam installs. Always with good success. EOS seems to have less zinc than
others advertise nowadays but so far it has worked well. Redline also makes
a zinc supplement.

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From: "Jim Webb" <jimwebb at nutsracing.com>

(Edit. .  .)  Which ZDDP additive would you recommend?