Picking the right Heads??

hemmerk · Dec 21, 2008

I have a '90 gt with TrickFlow upper and lower, CAI,e303 cam, MSD, 3.73's. Just wondering what some opinions are on heads for this mildly modded 5.0. It is just a street car, so nothing too expensive or nothing strip worthy....Thanks

hemmerk · Dec 21, 2008

Thinking right now it is between trickflow and AFR...anyone give me some help with this...Thanks

89stang1 · Dec 21, 2008

For your setup AFR 165s FTMFW!!!!!!!................u can save a hundred or 2 and buy less quality but why, i would say what u have is modified imho mildly modified is a K&N and headers. AFR 165s will respond great with your mods for street or track, it just comes down to they flow better than most others and better quality, so if u do want to add any power adders later face it we all do sooner or later u will have the right heads for the task. Im having RNH Performance build and install a 331 stroker with AFR 185 heads with a custom cam, shot of nitrous. And my car will be mostly a showcar, streetcar and then a strip car running maybe 15 passes a year at the track, i plan on driving to Carlisle, PA next summer and i live in central jersey gonna be a fun ride cant wait!!

PAzYearazzUP · Dec 21, 2008

You want documented flow charts on a head is what I would look for. You can port the head, but if the port is not flowing like the others, or close to it, you are gonna be all erratic on the performance.

You have someone with a porting tool that hogs out the hole is once the air hits that open room that was once a closet, is the air slows down and your performance lags is the head (port) shut down the air speed is she was way too big and now a stocker would have flowed better.

Now, you have that head(s) so as to match-blend the intake and exhaust hangers. In other words, you are going to have to press a foot print from intake port to head port so no edge acts as a wall that the air bumps into. Because (the bolt on flowing parts, i.e., manifolds), are now you slow-down-hanger-on's. Your work begins is so much work now on the intakes and exhaust end hangers. Where now, you take the header or if you use a flange for the header, then grind that away to match the exhaust port. You got the drill...

Moving air fast is no easy job. It's how detailed do you want those (parts hanging off each end of the head) to match that air going in and heading out is make it flow as fast as possible is the key for the... Need for Speed.

hemmerk · Dec 21, 2008

I also have BBK long tubes and a bbk off road h pipe. i really do not know much about heads, in fact does anyone know how to identify the heads already on a 5.0. I am pretty sure they are stock, and im not sure what a '90 gt has stock. But anyway, how hard is it to install a pair?

89stang1 · Dec 21, 2008

hemmerk said:
I also have BBK long tubes and a bbk off road h pipe. i really do not know much about heads, in fact does anyone know how to identify the heads already on a 5.0. I am pretty sure they are stock, and im not sure what a '90 gt has stock. But anyway, how hard is it to install a pair?

did u buy the car with that intake and cam on car already, because if u did the odds are u already have upgraded heads most of the time if u have a cam even a mild e cam u would have put heads on too. But if u do have stock E7 heads u really want to get some good heads u already have 95% of what u need stock E7 heads suck they dont flow for sh__ so with upgraded heads u will feel a major difference, i would go with AFR 165s u will love the difference!!!!!!!!!

OW yeah if u dont really know what your doing let someone else do its really not that expensive of a job

Grn92LX · Dec 21, 2008

trickflow twisted wedge.

hemmerk · Dec 21, 2008

I moderate when it comes to working on cars, I can do a lot, but I dont do major stuff. Yes, the cam and intake were already on the car, but the heads themselves look like they are older. But I am not for sure, and when I bought the car nothing was mentioned about the heads...is there any way to indentify?

89stang1 · Dec 21, 2008

If their not aluminum they are E7 or maybe GT40 iron i would updrade to aluminum if not aluminum!!

hemmerk · Dec 21, 2008

yeah i just checked them with a magnent...they are iron, so I assume that they have not been upgraded

89stang1 · Dec 21, 2008

hemmerk said:
yeah i just checked them with a magnent...they are iron, so I assume that they have not been upgraded

They could be GT40 Iron heads still a decent head, but if u have the money your setup would go nice with a set of aluminum heads u have the rest of the peices to the puzzle

martyd · Dec 21, 2008

I plan on running a setup close to yours and I plan on going with ported E7's with bigger valves along with a ported stock upper/lower. I plan on seeing atleast low 11's with traction.

89stang1 · Dec 21, 2008

martyd said:
I plan on running a setup close to yours and I plan on going with ported E7's with bigger valves along with a ported stock upper/lower. I plan on seeing atleast low 11's with traction.

Yeah i heard of making E7 work sometimes hell i had a 125 shot of nitrous working them i was in 12s but my point is, IS it worth it, and the stock intake upper and lower ive heard more over the years saying dont waste your time. If u can make those stock items get u in the 11s without any power adders, i'll pay u to do some portin for me your dam good at it

martyd · Dec 21, 2008

I planned on running the stock ported upper untill I make a sheet metal upper manifold

hemmerk · Dec 21, 2008

So I am going to go with trickflow or afr, which is irrelevant at the moment. If i went with AFR would those heads work with my trickflow intake??

And can someone please give me a brief summary of slapping new heads on???

Thanks...

Turkey Sammich · Dec 21, 2008

I have trouble picking the right head too. It sucks

martyd · Dec 21, 2008

The afr's will work fine with your intake. I suggest 165's for a more street based car and 185's for more of a street strip car. The 185's move your power curve up the rpm range from what I have seen. As far as the job itself.....to me it is rather easy. Take the intake off, unbolt your headers, pull the valve cover off, then the head bolts are exposed. Replace all gaskets and tq everything to spec when putting it back on and you should be golden. I'm pretty sure that you may want to go ahead and make timing changes when doing this also.

satanas · Dec 22, 2008

martyd said:
The afr's will work fine with your intake. I suggest 165's for a more street based car and 185's for more of a street strip car. The 185's move your power curve up the rpm range from what I have seen. As far as the job itself.....to me it is rather easy. Take the intake off, unbolt your headers, pull the valve cover off, then the head bolts are exposed. Replace all gaskets and tq everything to spec when putting it back on and you should be golden. I'm pretty sure that you may want to go ahead and make timing changes when doing this also.

Do you have to modify your pistons for 185's?I too can't decide on some heads but I have a supercharger so my set up might be a little different.

strtrcr50 · Dec 22, 2008

satanas said:
Do you have to modify your pistons for 185's?I too can't decide on some heads but I have a supercharger so my set up might be a little different.

Depends on the cam. I've read that in most cases, yes you have to modify/change the pistons with afr 185's.. From AFR's website:

3) Valve Clearance:
Piston to valve clearance must be checked before assembly. AFR 185cc aluminum cylinder heads with 2.020 valves usually will not fit a piston without valve notches having proper reliefs. Also AFR 205cc heads with 2.080 valves might experience the same issues.
NOTE:
All stock pistons must be notched for clearance.

martyd · Dec 22, 2008

I am pretty sure any head with 2.02 valves will require you to fly cut the pistons. The 165's have 1.90 valves though. If you will read Thumpers website you will see that big valves are not the be all beat all of a good set of heads though. This is why I am staying stock/ported. No reason for me to have a street car that will go any faster than low 12's on motor. To obtain the 11's I plan on a shot of spray also. I guess I should have mentioned that.

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