Factory Valve-Spring 'Load-Rates'
273/180 HP ~ 2-Barrel ......... #53 lbs. @ 1.69" ...... #143 lbs. @ 1.31"
273/235 HP ~ 4-Barrel ......... #83 lbs. @ 1.69" ...... #177 lbs. @ 1.31"
......................................................................... #189 lbs. @ 1.28"
318/230 HP ~ 2 Barrel .......... #103 lbs. ~ 1.69" .... #142 lbs. @ 1.31"
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1970 Engines
318/230 HP ~ 2-Barrel ......... #92 lbs. @ 1.65" ...... #189 lbs. @ 1.28"
340/275 HP ~ 4-Barrel ......... #96 lbs. @ 1.65" ...... #242 lbs. @ 1.21"
