Looking for a head porter with a very good CNC program for these heads. Who did you use? What were the final flow numbers? what did it cost?
You'd be wrong. By the time you buy new valves, springs and get them ported you'll be into them at LEAST $800(more likely over a grand) and there are LOTS of used Edels and TFS heads in great shape that you can get for that price or less on the classifieds here.Perhaps... But that was not the question..
I'm sure there are head porters out there that can exceed the low and mid lift flow numbers of many small port after market aluminum heads.
I didn't raise cost as a factor, but doubt they would be more expensive. You would also get to use better valves, a spring of your choice and have the chambers cut to the size you want.
Here is a connection that peaked my interest in ported GT40's
Who's got some good GT40 iron heads out there. ?
Any pics here or elsewhere of the egr bumps? I've got a GT40's on my Lightning engine, and would like to clean them up. These GT40's also have the Thermactor holes drilled in the rear, I believe the Explorer GT40's do not. Any value in starting with non Thermactor drilled heads vs. the ones I have?You'd be wrong. For GT40 heads you grind the egr bumps off and MAYBE get them milled. Thats it.
1.Good valves $200-$225 for a set of 16
2. A cnc port job AT LEAST $500-$600
3.Decent springs $100-$200
4. A set of gt 40's to work on around $300
You still need to have the heads worked at a machine shop and possibly add the cost of screw in studs and guideplates, valvejob, and possibly new guides, and also valvestem seals.
Looks like $1100+ easily and still won't work as well as an aftermarket head like afr-tw-edel-etc.
Why do you need to look stock? Unless you're getting the motor inspected for a class event why do you care so much? Hell you can always paint a set of aluminums black and look stock with them too.Think Stock Appearing Performance....
The man asked for gt40 porting experiance and half the posters have to tell him hes wasting his time and money,any fool with a credit card can whip up something fast.Painting up aluminum heads and installing an explorer intake makes you a poser when you tell people you have stock stuff and made it quick.Its about doing it,not about making it look like you did it.Why do you need to look stock? Unless you're getting the motor inspected for a class event why do you care so much? Hell you can always paint a set of aluminums black and look stock with them too.
I just think its a total waste of money and it WAS in my personal experience.
But hey its your money, if you want to spend $1000 on a set of iron heads that can't grow any more later on down the road more power to you.
Well said..... I have been there and wish I had some of my wasted cash back from some of my bad decisions from the past. If there had been info on the 'net for me when I started in this hobby in 1980, I would have been WAY ahead of the game.And its also not a very good investment to put $1000+ into a set of heads that have no more potential just to keep the stock appearance. I still don't get why people care so much if its stock looking or not. And even if it still looks stock it isn't so you're still lying about it.
He can do a search and find a ton of info on porters on here. Thumper is one that comes to mind. BB performance near me also does great work. However they're both going to charge at least $700 for the job. Again not my money but I think everyone here telling the OP not to waste his money is doing it because we've either been there or know someone who has and regrets it.