Factory Valve-Spring 'Load Rates'

69 Cuda 440 said
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"
___________________________________________________________

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"
Click to expand...

Rico-Suave,

Mopar did offer 'High Performance Valve Springs'.

In 1965 Mopar offered up a 'Dual Valve Spring for the 273.

It had a Load-Rate of >
... #98 lbs. @ 1.69"
.... #210 lbs. @ 1.295"

The 'Inner' Valve-Spring was rated @ 28 lbs. @ 1.53"

Mopar did offer a 'Extra High Performance' Valve Spring for the 340.

Mopar #5249847

It had a Load-Rate of
.... #103 lbs. @ 1.65"
.... #260 lbs. @ 1.21"