just did some port work on my stock ones .......seems like porting the stock ones doesn't get as good a flow #s as the gt40ps.....but in comparison to 1/4 mile times it seems alot more cost effective if you consider the price of gt40ps and the headers you have to buy to run them .........you can port,mill and rebuild the stock one's for a couple of hundred dollars and still use regular headers (better if you plan on new heads in the future)
i didn't port mine drasticly ,if you grind off the themactor bumps and smooth out the bottom of the exaust ports, just doing that is suposed to make a big differents.......i did that polished the intake and ex ports,milled off .020 ,replaced the springs and got a complete valve job all for about 400$ ......i paid a shop to do all the work ......didn't even have to clean um off ......still not done putting it back together.....i'll let you know how it runs
i considered getting the gt40ps , my reasoning for using the stock ones was for 400$ i could get the stock ones done, compared to 600$ for gt40ps and 175$ for headers .......from what i've seen numbers wise there wasn't enough of an increase in track times to justify the extra 1-2 tenths i'd get with the gt40ps ....plus i can still use the headers i allready have and if i get better aluminum heads in the futer i'm not stuck with the gt40 headers........if you can get a set of gt40ps used then it might be worth it ,other wise you can mill the old ones and port them and it'll make a big difference
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the "not so old",old guy
87 Mustang GT T-top >hanlon t-5, pro 5.0, centerforce clutch ,adj. cable/quatrant ,3.27s ,full 2 1/2 ex(off road H) adj. reg. ,e-cam ,70mm TB, cobra intake ,1.7rr ,ported/milled e7ets w/crane springs ,306 balaced/decked short block w/speed pro forged flat top pistons ...257rwhp/302rwt
best et 13.7@102 (4/11 )
'80 Capri (future project,currently collecting parts for 351 moter)
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