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Old 12-03-2023, 09:11 PM
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Does anyone know what the valve spring open/closed pressure is on the SM HR heads?

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Old 12-03-2023, 10:22 PM
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See post 66.

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Originally Posted by Johnny406 View Post
Does anyone know what the valve spring open/closed pressure is on the SM HR heads?

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Old 12-05-2023, 10:56 PM
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Does anyone know what the valve spring open/closed pressure is on the SM HR heads?

I'm looking for the same info, but for the flat tappet version if anyone has it handy.

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Old 12-05-2023, 11:04 PM
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I'm looking for the same info, but for the flat tappet version if anyone has it handy.
If you're running a solid flat tappet, the HR springs are quite adequate.

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1978 T/A 463 Pontiac, KRE 74cc 300CFM D-ports, Howard's custom SFT, Nash Intake,QFT 950 E85 carb, TCI TH-350, 4200 converter 3.73 12 bolt [email protected]
1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car.
1972 LeMans 350 Pontiac H/S Drags project
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Old 12-05-2023, 11:38 PM
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If you're running a solid flat tappet, the HR springs are quite adequate.
I bought the HFT version for a future project. Don't have a cam picked out but the spring specs would be helpful.

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