What is the maximum safe valve lift

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06-18-2017, 06:54 AM

CobraEd

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Join Date: May 2000

Location: Northern VA, VA

Cobra Make, Engine: Classic Roadsters

Posts: 2,765

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What is the maximum safe valve lift

I have a 70 302 with factory pistons with stock valve reliefs cut in them. I have Edelbrock Performer RPM heads and a Crane flat tappet cam that has .488 lift and 108 LSA.

I think I may have a lobe problem (another whole enigmatic story) and so I am thinking I need a new cam. I am thinking of a roller cam with 107 LSA.

What do you all believe is the maximum safe lift I can go to on the new cam with my piston/head combination ?

Thanks
Ed

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