gt40 heads

[bigbob]

hey fellas, plannin for heads on the 95 gt. i was looking into afr's and trick flow and all of thos but what about getting gt 40 heads and porting them? will it be good for a suppercharged set up? and how much is it to port heads
thanks abunch the craig

[GTStang]

Originally Posted by bigbob

hey fellas, plannin for heads on the 95 gt. i was looking into afr's and trick flow and all of thos but what about getting gt 40 heads and porting them? will it be good for a suppercharged set up? and how much is it to port heads
thanks abunch the craig

I'm not a fan of GT-40's, I know they are cheaper than the others you looking at but even with porting they still have small valves which are always going to be there biggest set-back compared to the others. Having them re-cut and putting in bigger valves plus porting is just going to inch you closer and closer to what you'd pay for AFR's or TFS's and you don't have the same amount of performance gain, or the dropping weight cause of aluminium. I'd say if you could get a set of very good ported job GT-40's with bigger valves put in them for around $700 I would consider it as far as cost vs performance assesment any more I'd just save for AFR's/TFS's etc..,

There is a difference between ideal and good. Will they be better than stock E7's on a S/C motor yea but are they ideal or close to ideal.... actually the are very far from it with those small valve inhibiting flow especially when an S/C is trying to cram more air in.

[91notchback]

my friend bought some gt40 heads with enlarged valves and pro port and polish for $450 i think. like less then 1000 miles on them too

[bigbob]

how did they work? is he happy with them? and can you guys tell me what the deal is with gt40 parts? sry thats vauge but i mean like i hear of them comming off explorers and cobras and stuff, are they just stock parts for cobras and explorers? and then they have the ford racing aluminum ones and then there is the x,y,p different head moddles can you guys school me on these parts please? thanks abunch

[SVTcobra306]

I've posted this before, not here though...

GT-40 irons-64cc Chambers, 1.84 intake/1.54 exhaust valves. Stock 93-95 Cobra, Lightning had 65cc chambers and drilled for larger head bolts.

GT-40p's-Cast iron, 60cc chamber, 1.84 intake, 1.46 exhaust. Stock Explorer 5.0, requires MAC or "P" specific FRPP headers due to modified plug angle. Makes slightly more power than GT-40 due to higher compression and better exhaust flow (despite smaller valve).

GT-40 Y's: Aluminum, 1.94 int./1.54 exh. 160cc intake runners. 53cc exh. runners. 64cc chamber

GT-40 X's: Aluminum, 1.94 int./1.54 exh. 178cc intake runner, 62cc exh. runner. 64 or 58cc chamber.

[SVTcobra306]

I personally plan on over 300 rwhp and running solid 12s with GT-40 X305's and my 306 in a full weight Cobra.