Seller notes

High port flow gives great performance now, and more later when additional upgrades are doneHeads are fully assembled with springs and valvesCompression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications79cc heads work great with stock motors for 88" to 103" motors; 89cc heads work best for motors over 103" or with high-compression pop-up pistons79cc have 1.940" intake and 1.575" exhaust valve and springs for up t...

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