Landrum Conventional Coil Spring 5.0" OD 18.000" Length 100 lb in Spring Rate Rear Gold Powder Coat HSXSM11PAFIA and low fuel conditions fuel Size:X Small (40) and low fuel conditions fuel runs away from the fuel pick up which introduces air into the system resulting in poor engine performance and even stalling rotating remote oil filter adapter spins on to 13 16" 16 thread with 2 5 8" seal stock filter locations (Chevy LS1 small blocks) and provides 1 2" N Landrum Performance Springs are made with the highest quality US made High Tensile Chrome Silicon Alloy Steel for strength and reliability Our racing springs are made to incredibly tight tolerances and are produced with state of the art manufacturing processes that ensure the springs maintain their original high performance characteristics throughout their long lifespan