Wiseco WIS-K416B3
The Wiseco piston is a maximum-performance XLS (Extra Light Series) flat-top designed for road or drag racing. The pistons incorporate lateral gas ports, which keep them free of carbon for better long-term sealing. Each valve relief features extra-deep valve pockets for use with big cams and valves. The special skirt shape stabilizes the piston in the bore, for decreased wear and increased power. Also of interest, Lunati pistons are designed in conjunction with Wiseco for its specialized rotating assemblies.
| Bore | 4.030 inches |
| Stroke | 3.750 inches |
| Rod Length | 6.00 inches |
| Compression height | 1.125 inches |
| Compression | 11.3:1 (approx) |
| Style | Flat-top, 2 reliefs |
| Material | Forged 4032 alloy |
| Head | 62 cc |
| Pin diameter | 0.927 inch |
| Pin type | Floating |
| Top groove | 0.043 inch |
| Second groove | 0.043 inch |
| Oil groove | 3mm |
| Weight (grams) | 329 g |
| Dome volume | -4.6 cc |
| Price | $710 |
CP S1510
This piston from CP Pistons is capable of operation with up to a 200-horse shot of nitrous or mild boost applications. Each piston is manufactured within 1 gram and features precision ring grooves. The pistons are machined with dedicated left and right installation and will work with all 23-degree cylinder heads. Available from CP Pistons.
| Bore | 4.030 inches |
| Stroke | 3.750 inches |
| Rod Length | 5.70 inches |
| Compression height | 1.425 inches |
| Compression | 10.9:1 (approx) |
| Style | Flat-top, 2 reliefs |
| Material | 2618 Forged aluminum |
| Head | 64 cc |
| Pin diameter | 0.927 inch |
| Pin type | Floating |
| Top groove | 11/416 inch |
| Second groove | 11/416 inch |
| Oil groove | 31/416 inch |
| Weight | 447 g |
| Dome volume | -5 cc |
| Price | $716 |