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Tri-Fives with the popular "605" power steering box will encounter header clearance issues using the latest aluminum heads with raised exhaust ports. We tried 2-inch headers made to fit with stock heads, but they would not fit with our new castings. The 2-inch tubes also rested against the bellhousing area of the block and trans, creating a N-inch gap between the header flange and the head. AFR's Tony Mamo recommended we use 2-inch (minimum) or 2 V-inch tubes for the higher-flowing heads to produce optimum power.