Port and Polish?

If your truck is normally aspirated dont be surprised if you dont get a lot of improvement over stock in the normal or useable RPM range with port and polish. I had a set of heads done by a very reputable shop 4 years ago and had nothing but problems. The improvements were all in the high RPM range(4500+), no noticeable difference in the lower RPM range, Dyno'd horsepower gains were only 17hp over stock, and I had a CEL going off that would light up almost every code in the book. after fighting issues for 6 months I finally bought a new set of heads.
IMO if you decide to port and polish I'd only do it to a S/C or Turbocharged engine running a wide band O2 sensor.
My brother has the heads on his S/C Tacoma and feels the seat of the pants performance is increased, but hasnt had the truck dyno'd since changing heads. He has a wideband sensor and 7th injector and has'nt been getting lights like I did.

Tim

I never did try computer changes because I'd just moved from Virginia to Italy and the logistics of getting parts was near impossible, thats why I eventually replaced the heads with a factory set.
I think you could work those issues out on a normally aspirated truck by using a modified ECU, wide band sensor, and a custom fuel delivery system, but I dont think the money spent and hassle would be worth it for the power gained. On a S/C or Turbocharged truck your already into $$ and the HP gains seem to be alot larger as I saw on my brothers truck, you also have enhanced fuel delivery if you've used a URD or 7th injector kit. Speed costs, how much you wanna pay?
One thing I did notice on my brothers truck is a distinct lack of low end torque, I have an opinion on how that happened, but with out a Dyno run it's only an opinion.

Tim