275cc LS3 HEADS SPRING KITS:PAC 1209 DUAL SPRING KIT 040 Exhaust: 1

040                    Exhaust:     1

We offer this cover with or without our breather design

140                    Exhaust:     1

8 Int 159 250 302 347 386 410 416 Exh 105 181 187 223 240 248 252

275cc LS3 HEADS SPRING KITS:PAC 1209 DUAL SPRING KIT 040 Exhaust: 1Our 275CC heads start as an aftermarket casting that we designed our own port for. These heads perform very well compared to other 260cc heads on the market. Our 260 LS3 ported heads include: Our in house CNC port Bronze valve guides PCD surfaced to your desired chamber size Proprietary competition valve job Your choice of spring kit Rev 2. 165 intake valves REV 1. 600 exhaust valves This is our most common setup, but if this doesnt meet your needs