PAC 1903 Springs.

[ValiantKindOfGuy]

Anybody test pac 1903 from 1.8” down to 1.2”. Need pressure measurements haven’t got the heads yet but I want to order springs if they won’t work. Cam grinder recommended 140 on the seat and 340-360 open.

 

[j par]

@70aarcuda

 

[PRH]

On my tester they check very close to the published specs.
Which are:
149@1.800
384@1.200

 

[70aarcuda]

• installed Height/Pressure: 1.800"--145#

• Pressure @ .550" lift: 358#

• Pressure @ .600" lift: 375#

• Pressure @ .650" lift: 400#

• Pressure @ .700" lift : 425#

• Coil Bind: @ .750" lift

• Outer Spring ID/OD: 1.075" /1.459"

• Inner Spring ID/OD: 1.078" / .794"

• Type of Spring: Dual

• Spring Rate 391

Best to ask PHR.....