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Originally Posted by Idaho2018GTPremium
How about DOHC vs pushrod on an emissions per hp basis? I'm thinking DOHC designs allow for cleaner exhaust, thus, lower emissions on a per hp basis, but I am not certain. My Gen 3 Coyote (2018 GT) is an ULEV (ultra low emissions vehicle) engine, I think the LT1 in the SS is only LEV...the design might have something to do with it.
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If anything the DOHC engines might actually have poorer MPGs for what it's worth. A lot of those numbers you're talking about that gives them this or that certification are easily manipulated. And it might not really be about the engine. It could be the gear and trans ratios etc. It could be the tune. The cats...I remember Ford used to put 6 cats on the New Edge GTs. So is it a low emissions "vehicle" or a low emissions "engine"? If it is the vehicle then GM could simply slap an extra cat on it and clean the tune up and there you go.