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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
thats hard to say, it depends on a lot more than just port and non port heads. depends on the rest of the setup. but i would say u would see a 25-30 hp gain with well ported gt40 heads. thats just a guess though, dont take it to the grave.
so on my stock lower end with gt40p heads ported and polished and gt40 intake ported and polished with the bbk 70 mm tb and 73 mm maf clibrated to 24 lb inj with a 255 lph pump, i should see over 300 rwhp?
with a cam^^^ not on the stock cam u wont. probably around 260 wheel with stock cam. get a b cam or trick flow 1 cam is a great cam. and with that u will c close to if not 300 wheel.
get some better heads then thos. Try procomp. they are aluminum and if you get a assymbled set and you port and polish them you will see way better gains then the gt40s