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A specially developed skirt shape is easy on cylinder walls and makes excellent power!   Wiseco Pistons - Chevy 23° 350 XLS (Xtra Light & XLS Pro) Included: Pistons, Pins & Spirolox (no rings) Piston Descriptions: Original Xtra Lite Series: sets new standards for light weight, quicker revving and reduced loads on the bottom end. A specially developed skirt shape is easy on cylinder walls and makes excellent power. GF Ring Series: Taking the XLS series a step further, the GF Ring package and gas ports reduce friction for noticeable increases in power. Extra deep valve pockets and a thicker deck allow for higher HP, bigger cams and more radically milled heads. Pro Series: The ultimate SB flat tops, the Pro Series, has ultra low drag rings, gas ports and gas equalizer grooves. Deeper valve pockets and thicker deck allowing for radical cams and head milling. All Pistons Feature: Radiused Valve Pockets Skirt design allows for as little as .004" clearance with excellent wear properties. Anti Detonation Grooves with the added benefit of keeping the top ring groove free of carbon Pressure groove for enhanced ring seal. Features Chrome Moly Pins and Spirolox

Part # Bore Comp HT Stroke Rod Avg. WT Vol. Comp Ratio at: Price 58cc 62cc 67cc 76cc 350 XLS - 2BBL Xtra Light Series (STD Tension Rings: 1/16, 1/16, 3/16) K167A3 4.030 1.50 3.480 5.700 379 -3.2 11.3 10.8 10.1 9.2 $667.30 K167A4 4.040 $667.30 K167A6 4.060 $667.30 K166AS 4.004 1.250 3.480 6.000 336 -3.2 11.3 10.8 10.1 9.2 $667.30 K166A2 4.020 $667.30 K166A3 4.030 $667.30 K166A35 4.035 $667.30 K166A4 4.040 $667.30 K166A6 4.060 $667.30 K261A2 4.020 1.125 3.480 3.750 6.125 6.000 331 -3.2 11.3 10.8 10.1 9.2 $667.30 K261A3 4.030 $667.30 K261A35 4.040 $667.30 K261A4 4.060 $667.30 350 XLS - 4BBL Xtra Light Series - .047 GF Ring Packs - Deep Valve Pockets - Thick Deck - Gas Ports (STD Tension Rings: 1.2, 1.2, 3mm) NEW for '09: Updated to include GFX Gas Nitrided Rings & Skirt Coating K412F2 4.020 1.550 3.480 5.700 374 -4.6 11.1 10.6 10.0 9.0 $729.89 K412F3 4.030 $729.89 K412F4 4.040 $729.89 K412F5 4.050 $729.89 K412F6 4.060 $729.89 K413F2 4.020 1.250 3.480 6.000 335 -4.6 11.1 10.6 10.0 9.0 $729.89 K413F3 4.030 $729.89 K413F4 4.040 $729.89 K413F5 4.050 $729.89 K413F6 4.060 $729.89 350/383 XLS Pro - 4BBL Xtra Light Series - Pro Series .043 Rings - Deep Valve Pockets - Gas Ports (Low Tension Rings: .043bc, .043, 3mm) K414BS 4.000 1.550 3.480 5.700 380 -4.6 11.1 10.6 10.0 9.0 $729.89 K414B3 4.030 $729.89 K414B4 4.040 $729.89 K414B6 4.060 $729.89 K415BS 4.000 1.250 3.480 6.000 345 -4.6 11.1 10.6 10.0 9.0 $729.89 K415B3 4.030 $729.89 K415B4 4.040 $729.89 K415B6 4.060 $729.89 K416BS 4.000 1.125 3.480 3.750 6.125 6.000 329 -4.6 11.1 11.9 10.6 11.3 10 10.7 9 9.7 $763.22 K416B3 4.030 $763.22 K416B4 4.040 $763.22 K416B6 4.060 $763.22

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