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| Brand | | Speed Pro |
| Manufacturer's Part Number | | ZH345NP30 |
| Part Type | | Pistons |
| Product Line | | Speed-Pro Hypereutectic Pistons |
| Summit Racing Part Number | | STL-H345NP30 |
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| Bore (in) | | 4.030 in. |
| Bore (mm) | | 102.362mm |
| Piston Style | | Flat top, with four valve reliefs |
| Piston Material | | Hypereutectic aluminum |
| Compression Distance (in) | | 1.560 in. |
| Piston Head Volume (cc) | | +5.00cc |
| Wrist Pin Style | | Press-fit |
| Pin Diameter (in) | | 0.928 in. |
| Piston Ring Thickness | | 5/64 in. x 5/64 in. x 3/16 in. |
| Quantity | | Sold individually. |
| Calculator | | Compression Calculator |
| Tool | | Stroker Combinations |
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If you're looking for pistons with an unbeatable combination of performance and value, then Speed-Pro hypereutectic pistons are for you. These pistons are manufactured from FM244 aluminum alloy, which contains 16 percent silicon for greater strength and wear resistance. They're also molded in the latest permanent-mold technology to ensure the precise fit and tight bore clearances that today's top engine builders demand. They're ideal for use in high performance street, bracket racing, and oval track racing and will work perfectly with normal ring end gaps.
Due to the multiple variables possible with any engine combination, all compression ratios listed are approximate. To accurately calculate the static compression ratio of any engine, the following values must be known: Bore diameter, stroke length, rod length, deck height, combustion chamber volume, cylinder head gasket compressed thickness, and cylinder head gasket bore diameter.