8005 Single Spring w/dampner, springs are designed for big block motors that require a 1.5250 outer diameter spring. Springs are desigend for street/strip applications with cam combination with no more than .690-.750 lift. Spring pressures and installed heights are as follows.
140lbs at 1.900
165lbs at 1.850
180lbs at 1.800
350lbs at 1.300
365lbs at 1.250
380lbs at 1.200
Coil bind at 1.160
Installed spring height should be checked with your camshaft specs of your application.
Guide Plate & Rocker Stud Kit For These Heads Available for $69.95,
Head Stud Kit $89.95,
BBFord 1.73 Premium Aluminum Roller Rocker Arm Set $125.00
Average Flow Figures @28" CFM Water Intake (according to manufacturer tests).