swapped from the 5.3 (L83) to the 6.2 (L86) intake manifold and throttle body. suppose to give you some extra HP/TQ along with some improved throttle response. easy mod to do best to do with help but one guy could do it in about an hour an half.
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^^^^^^ where the idea came from
PART NUMBER FOR SWAP
12639087 L86 intake manifold
12639086 6.2 throttle body gasket
12626354 manifold gaskets
12678223 throttle body
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If you want to do a ported throttle for even more HP/TQ
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