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  1. Engine
    Just got the dyno numbers from Mark on my new 496 4 bolt build. Cant speak high enough about working with Mark thus far I'm excited to get this monster installed!! 4.310 X 4.250 9.9 compression, ported 049 GM heads 1.880/2.190 238/248/578/608/108/104.5 Hyd roller, Performer RPM air gap intake...