Streetline Dual Valve Springs Kits Hydraulic Flat Tappet Suits "CAST IRON" Holden 304, 308, Chevy 350, 302 Windsor cast iron heads w/ 11/32" valve,

Detroit Racing Products - Dual Valve Springs Kit for Hydraulic Flat Tappet Streetline Series. The DRP One System - Dual Valve Springs System

Fits Holden 253, 304 & 308, Chevy 350, Ford Windsor Cast iron cylinder heads with 11/32" valves.* Note: Machine work is required to use dual valve springs. 

Upgrade & modernise your 308 Holden* with these small OD, light weight valve springs kits. 

DRP Streetline dual valve springs increase RPM & power to your build without breaking your budget.

Engineered for the street and built to perform, it’s the perfect choice for street machines, cruisers, and classic V8s that take the punishment of everyday performance.

Ideal for street use and moderate race applications, Streetline parts are manufactured from premium-grade materials, engineered for reliability, and priced for value!

What's in the Kit?

• DRP/PAC Dual Springs - DRP-8336S-16
• Comp Cams Steel Retainers - 7 Deg Chromoly
• Comp Cams Street Locks - 7 Deg / 11/32" Valve square groove 
• Comp Cams Valve Stem seals: Teflon push-on type - 0.530" / 11/32" Valve
• *No locator - use the cast iron guide in the cylinder head

*Note for Cast Iron Cylinder heads & Holden 253, 304 & 308: 

• Holden cast iron V8 heads will need spring pads machined down to fit a 1.800" installed - use Comp Cams cutter #4716CPG - Cutter is 1.320" OD x 0.630" ID
• Or use cutter Comp Cams# 4672 1.340" OD with .560" ID.
• No Spring locator is included in this Kit as the guide will locate the spring. Use a steel shim as the base when getting your target spring installed height. 

Installed Height: 1.800"

Seat Load: 125lbs @ 1.800" / 142lbs @ 1.750"

Spring Rate:   336 lbs / inch

Max Lift: .660" @ 060" safety. when installed at 1.800"

BE ADVISED: IMAGE MAY DIFFER FROM ACTUAL PRODUCT.