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It takes a lot of work to make a non vortec manifold work.The angle that the intake meets the head is completly different.Takes lots of welding and macchine work.When vortecs first came out there was not many performance intakes available.They had to be built.
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70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires
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