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Our reciprocating assembly consisted of a Lunati rod/JE Pistons tandem. The 6.125-inch 4340 rods are lightweight and compact in size, requiring minimal block clearancing as noted before. JE's Forged Side Relief (FSR) pistons are designed to avoid reluctor wheel clearance issues in Gen X engines. The inverted-dome configuration is intended to create forced-induction-friendly compression ratios.