will 77 model 351w heads take .500 lift - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-03-2008, 05:44 PM
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will 77 model 351w heads take .500 lift

i have a 77 351w and i was wonder if the stock valve spring will take a cam this big with out mods any help
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 1,800-5,800
Intake Duration at 050 inch Lift: 224
Exhaust Duration at 050 inch Lift: 224
Duration at 050 inch Lift: 224 int./224 exh.
Advertised Intake Duration: 270
Advertised Exhaust Duration: 270
Advertised Duration: 270 int./270 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.500 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.500 in.
Valve Lift with Factory Rocker Arm Ratio: 0.500 int./0.500 exh. lift
Lobe Separation (degrees): 110
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.
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Old 06-03-2008, 07:16 PM
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Not sure about the 77 heads but the 69 heads will. I used to tell my customers that .500 was the limit for the studs. have replace several studs, because of too much lift.
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Old 06-04-2008, 06:53 PM
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thanks

i guess i wil have to get new springs thanks for the help
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