I'm pushing 657 rwhp on a stock 2014 GT motor on 9psi and 91 octane, and know it's only a matter of time before she pops. Looking into it I can get a built short block from Brenspeed or others, or I can get a completely new long block gen 2 Coyote for MY15 and swap it in with cam and timing changes. Both are about $5K for the parts, just wondering which is a better idea. Any thoughts?
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