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Old 03-03-13, 06:18 PM
412usa 412usa is offline
Join Date: Jul 2008
Posts: 107
Default BS engine specifications

I have been asked the following by my engine builder and I don't know the answers. Can anyone help?

Rocker ratio.
Duration and lift on a 40:80:8040 cam.
Valve lift
Spring pressures on the seat and on the head.

Any help would be appreciated. I can't find this info in the manual but I might be misunderstanding the terms.
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