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Smog/Non-Smog Legal Heads


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Does any one know the difference between smog legal heads with C.A.R.B numbers and non-smog legal cylinder heads? Could i get away with using heads with out C.A.R.B numbers on my 92 Silverado, as long as I still past emissions tests? Also what items are checked for such, egr, etc..., during a safety/emissions test? Any help would be greatly appreciated.

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