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If I ported my stock heads what would be an appoximate HP gain on a 1991 VR4, heavily upgraded, turbos, Fuel system...........Corey
 

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i got mine done when i blew my engine, it cost me 650 for porting and polishing and a triple cut valve job, the shop said it would give me 25hp. when everything went back togather i did other mods as well so i cant tell exactly how much more power i got from that alone. at the least i can say that it hasnt caused me any problems.
 

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Yes, this is in the area of the possible gain. But you'll benefit more of this with running more fuel and bigger turbos. Also you may think about upgrading the throttle body as well !
 
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