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Mercury C4 automatic transmissions recalibrates your automatic transmission for optimum performance and extended life
316 Stainless steel weldment bungs for 1/4" EGT probes
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BlackHeart LS Swap Exhaust Manifolds-Rear Dump SBC Exit-Black - 8506-3HKR header-back-exhaust Mercury C4 automatic transmissions recalibratesFor applications or projects where our standard LS swap manifolds (8501HKR, 8502HKR, 8503HKR series) don't quite fit and our "center dump" manifold (8504HKR) exits too far forward, our new rear dump and rear dump SBC exit cast iron swap manifolds have arrived. These differ in that they exit in a straight down fashion much like a block hugger header but exit more toward the rear of the engine than our "center dump" manifolds. While almost the same as
