PAC Racing Springs LS Extreme Duty Dual Springs, Set of 16, PAC-1237X
PAC
PAC Racing Springs Extreme Duty Dual Springs are a severe duty, dual valve spring designed for lightweight valvetrain applications. Direct replacement for most aftermarket cylinder heads with LSx style springs.
This spring can be used in most severe duty hydraulic roller and some solid roller valvetrains and features PAC Racing's patented materials and wire construction.
| Part# | I.D. Outer (in) | O.D. Outer (in) | Inside Spring I.D. (in) | Install Load (LB) | Install Height (in) | Open Load (LB) | Open Height (in) | Coil Bind Max (in) | Lift Max (in) | Frequency Outer (CPM) | Frequency Inner (CPM) | Damper | Quantity | |
| PAC-1529 | 1.284 | 0.9 | 0.630 | 180 | 1.900 | 600 | 1.150 | 1.085 | .750 | 32185 | 34200 | No | 1 | |
| PAC-1530 | 0.900 | 1.284 | 0.616 | 160 | 2.000 | 580 | 1.250 | 1.180 | 0.750 | 29735 | 32947 | No | 1 | |
| PAC-1335 | 0.900 | 1.3 | 0.616 | 250 | 1.800 | 860 | 1.050 | 0.985 | 0.800 | 40679 | 44180 | N/A | 1 | |
| PAC-1237X | 1.274 | 0.9 | 200 @ 1.800 | 585 @ 1.100 | 550 | N/A | PAC-S128 | N/A | 1 | |||||
| PAC-1238X | 1.274 | 0.9 | 250 @ 1.800 | 700 @ 1.050 | 600 | N/A | PAC-S128 | N/A | 1 | |||||
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