absolutely you can. Sometimes make just as much power as you could with aftermarket versions. The E7TE heads suffer bad from flow potential so any porting and polishing will greatly help them. Most people port and polish their stock heads when they don't have money for aftermarket versions. So yes you can.
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68 Camaro
Gene Fulton 632ci Two stages of Jug
8.41 164mph Rockingham 1-26-03
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