Factory Valve-Spring 'Load Rates'

Factory Valve-Spring 'Load-Rates'

1964 thru 1967 {'Mechanical' Camshaft}
273/180 HP ~ 2-Barrel ......... #53 lbs. @ 1.69" ...... #143 lbs. @ 1.31"

1965 thru 1967 {'Mechanical' Camshaft}
273/235 HP ~ 4-Barrel ......... #83 lbs. @ 1.69" ...... #177 lbs. @ 1.31"
......................................................................... #189 lbs. @ 1.28"

1968 and 1969 {'Hydraulic' Camshaft}
273/190 HP ~ 2-Barrel ......... #103 lbs. @ 1.69" .... #142 lbs. @ 1.31"

1968 and 1969 {'Hydraulic Camshaft}
318/230 HP ~ 2 Barrel .......... #103 lbs. ~ 1.69" .... #142 lbs. @ 1.31"

1968 thru 1973 {'Hydraulic' Camshaft}
340/275 HP 4-Barrel ............ #96 lbs. @ 1.65" ..... #242 lbs. @ 1.21"

1970 and later {'Hydraulic' Camshaft}
318/230 HP ~ 2-Barrel ......... #92 lbs. @ 1.65" ...... #189 lbs. @ 1.28"