SOLID ROLLER Dual Valve Springs, PROLINE, 250lbs@1.800" / 500lbs/in (LS1, LS2, LS3, Holden 308 & SBF 302w 351w Windsor SBC Chevy 350)

DRP High RPM Polished LS Dual Valve Springs fits LS1, LS2, LS3. PROLINE SERIES

Also Fits*- Chevy 350 & 302 347 351 Ford Windsor & Holden 308 wtih Solid Roller applications.

Also Fits* - 351 Cleveland & BBC 454 with small Solid Street Roller applicatioins. 

*Note* can be installed higher for a lighter application or more lift if required. 

Proline Race/Endurance high performance series valve springs by PAC Springs manufactued for DRP.

Small diameter, light weight PAC dual valve springs. These LS small OD style, Polished suits Solid Roller camshaft applications. A perfect balance of design between mileage and high performance. Upgrade to the DRP light weight valvetrain, the "Smart Spring System". 

Installed Height (normal): 1.800"  (LS)

Seat Load: 250lbs@1.800" /  225lbs@1.850" / 200lbs@1.900"

Open pressure @ .620" lift: 590lbs open / 1.800" installed height

Valve Spring Rate:   500 lbs

Coil Bind Height: 1.080"

Max Lift: 

• 0.660" @ 060" safety when installed at 1.800"
• 0.710" @ 060" safety when installed at 1.850"

MADE IN U.S.A BY PAC SPRINGS.

Recommended Parts:

Retainers:

• 11/32 Valve Stem: - use DRP-RT1132-16  (Chromoly)
• 11/32 Valve Stem "Tool Steel" - use Comp Cams# 1777-16
• 8MM Valve Stem: - use DRP-RT8mm-16  (Chromoly)
• 8MM Valve Stem "Tool Steel" - use Comp Cams# 1779-16

Spring Locators: 

• 0.500" Guides for LS1, LS2, LS3 use:  DRP-SL500-16 
• 0.570" Guides for aftermarket cylinder heads use:  DRP-SL570-16 

Load Chart:

Spring Height Inch	Load lbs
2.050	125
2.000	150
1.950	175
1.900	200
1.850	225
1.800	250
1.750	275
1.700	300
1.650	325
1.600	350
1.550	375
1.500	400
1.450	425
1.400	450
1.350	475
1.300	500
1.250	525
1.200	550
1.150	575
1.100	600
1.080	Coil Bind

*May require machine work and modification.