2021-22 Circle Track Catalog

Nomex Socks /LJKWDQGFRPIRUWDEOH¿UHUHVLVWDQW1RPH[ socks keep feet clean and dry. Meets SFI 3.3 VWDQGDUGV2QHVL]H¿WVDOO2IIHUHGLQZKLWHRU black. Size White Black One-Size-Fits-All K1R26-NSO K1R26-NSO-N Single Layer Nomex Head Sock NEW! K1R17-FPP-N 2QHVL]H¿WVDOOKHDGVRFNPHHWV6), VSHFL¿FDWLRQV%ODFNRQO\ Flex Balaclava %DODFODYDFRPELQHV1RPH[DQG QDWXUDOYLVFRVH¿EHUVWRSURYLGHLQFUHDVHG¿UHSURWHF - tion and improved breathability. Meets SFI and FIA standards. Choose from white or black. Black White K1R26-FHS-N K1R26-FHS-W

Nomex Headsock Comfortable and cool while providing an extra lay- er of protection, headsocks are offered in single or GRXEOHOD\HUYHUVLRQV0HHWV6),DQG),$VSHFL¿FD - tions. Choose from black or white. Description Black White Single Layer K1R26-SLH-N K1R26-SLH-W

Nomad Travel Bag NEW! K1R33-NOM Large enough to store

and transport a com- plete driving suit plus gloves, shoes, helmet, undergarments, etc. Rugged attractive bag is emblazoned with the K1 RaceGear logo.

Hypereutectic Pistons Keith Black pistons have several important advantages over conventional alloy pistons. High silicon content yields superior thermal and wear char- acteristics, greater strength, scuff and seizure protection, and resistance to cracking. High silicon content also keeps heat in the combustion chambers, eliminating heat transfer and improving combustion. Pistons are machined IRUWRSVHFRQGDQGRLOULQJXQOHVVQRWHG6ROGLQVHWVRIHLJKW with wrist pins (except Ford 2300cc, sold in sets of four).

Comp Ratio

Head Volume

Comp Ratio

Head Volume

Part No.

Description Bore Stroke Rod Length

Part No.

Description Bore Stroke Rod Length

Small Block Chevrolet 283-400 (Cont.) KBPKB157.030 Dome 4.030" 3.250" 5.700" 10.5:1 +.5cc KBPKB157.040 Dome 4.040" 3.250" 5.700" 10.5:1 +.5cc KBPKB193.030 Dish 4.030" 3.480" 5.700" 9.6:1 -12cc KBPKB197.STD D-Cup 4.000" 3.750" 5.700" 10.3:1 -12cc KBPKB197.030 D-Cup 4.030" 3.750" 5.700" 10.3:1 -12cc KBPKB197.040 D-Cup 4.040" 3.750" 5.700" 10.3:1 -12cc KBPKB228.030 Flat Top 4.030" 3.480" 5.700" 10.2:1 -7cc KBPKB231.030* Flat Top/LW 4.030" 3.480" 5.700" 10.3:1 -6cc Small Block Ford 289-351W KBPKB115.030 Flat Top 4.030" 2.870" 5.090" 9.1:1 -6cc KBPKB115.040 Flat Top 4.040" 2.870" 5.090" 9.1:1 -6cc KBPKB116.030 Dome 4.030" 2.870" 5.090" 9.9:1 +2cc KBPKB116.060 Dome 4.060" 2.870" 5.090" 9.9:1 +2cc KBPKB246.030* Flat Top 4.030" 3.400" 5.400" 10.0:1 -6.5cc KBPKB246.040* Flat Top 4.040" 3.400" 5.400" 10.0:1 -6.5cc Ford 2300cc 4-Cylinder (Sold in sets of four) KBPKB217.030* Flat Top 3.810" 3.126" 5.205" 8.7:1 -4.5cc KBPKB217.040* Flat Top 3.820" 3.126" 5.205" 8.7:1 -4.5cc KBPKB218.030* Flat Top 3.810" 3.126" 5.700" 8.7:1 -4.5cc KBPKB218.040* Flat Top 3.820" 3.126" 5.700" 8.7:1 -4.5cc Small Block Chevrolet 283-400 KBP9902HC.030 Flat Top 4.030" 3.480" 5.700" 10.4:1 -5cc KBP9902HC.060 Flat Top 4.060" 3.480" 5.700" 10.4:1 -5cc KBP9903HC.030 Dome 4.030" 3.480" 5.700" 11.6:1 +14cc KBP9903HC.040 Dome 4.040" 3.480" 5.700" 11.6:1 +14cc KBP9904HC.030 Dome 4.030" 3.480" 5.700" 11.6:1 +4cc KBP9908HC.030 Flat Top 4.030" 3.480" 6.000" 10.4:1 -5cc KBP9908HC.060 Flat Top 4.060" 3.480" 6.000" 10.4:1 -5cc KBP9909HC.040 Flat Top 4.040" 3.750" 6.000" 11.1:1 -5cc KBP9911HC.030 Flat Top 4.155" 3.750" 5.700" 11.7:1 -5cc Note: Compression ratios are based on a 64cc combustion chamber. Part No. Description Bore Stroke Rod Length Comp Ratio Head Volume

Small Block Chevrolet 283-400 KBPKB112.030* Flat Top 4.030" 3.480" 6.000" 10.2:1 -7cc KBPKB119.030 Dome 4.030" 3.480" 5.700" 11.2:1 +.5cc KBPKB120.030 Flat Top 4.030" 3.480" 5.700" 10.2:1 -7cc KBPKB120.040 Flat Top 4.040" 3.480" 5.700" 10.2:1 -7cc KBPKB120.060 Flat Top 4.060" 3.480" 5.700" 10.2:1 -7cc KBPKB122.030* Flat Top 4.030" 3.750" 6.000" 10.9:1 -7cc KBPKB122.040* Flat Top 4.040" 3.750" 6.000" 10.9:1 -7cc KBPKB125.030 Flat Top 4.155" 3.750" 5.700" 11.4:1 -7cc KBPKB129.030 Dome 4.155" 3.750" 6.000" 12.9:1 +3.25cc KBPKB134.030 Flat Top 4.030" 3.750" 5.700" 10.9:1 -7cc KBPKB134.040 Flat Top 4.040" 3.750" 5.700" 10.9:1 -7cc KBPKB135.030 Dish 4.030" 3.750" 5.700" 9.7:1 -18cc KBPKB147.030 Dish 4.155" 3.750" 5.700" 10.2:1 -18cc KBPKB156.030 Flat Top 4.030" 3.250" 5.700" 9.6:1 -7cc KBPKB156.040 Flat Top 4.040" 3.250" 5.700" 9.6:1 -7cc KBPKB156.060 Flat Top 4.060" 3.250" 5.700" 9.6:1 -7cc Notes: * Signifies piston machined for 1/16" top, 1/16" second and 3/16" oil rings. Compression ratios are based on a 64cc combustion chamber.

Claimer Series Performance Pistons Achieve maximum performance with high piston ring placement and low thermal con- ductivity. Top rings operate at higher temps and require slightly larger end gaps (4.000" ERUH[JDSIDFWRU WRWDOHQG gap). It is recommended that ignition timing EHUHWDUGHGƒ3LVWRQVDUHPDFKLQHGIRU WRSVHFRQGDQGRLOULQJV6ROGLQ sets of eight with wrist pins.

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CIRCLE TRACK 2021-22

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