valve problem

pearlgt40 306 · 07-04-2003, 08:54 PM

ive run into a problem..took my heads off so my friend could bring them into class (we go to UTI) and flow them. During the flowing a mishap occurs...blah blah blah.....bent exhaust valve. I figure..no problem. hes buying me a new one. He does. Its the wrong valve.. the lock groove is higher on the stem than mine... and the valve itself is shaped a little differently.(better) Now we have a problem...according to ford motorsports the valve i bought can be used in gt40 cast iron or aluminum heads... obviously not. Could they have redesigned the valves since i bought my heads 3 or 4 years ago? So now im looking for a valve. 1.54" Gt40 iron/ exhaust valve. please help... i really need to get my car back on the road. The parts guy at the dealership where i got the valve and I cannot figure out why the new one would be different from what I have.

TMASTER · 07-04-2003, 09:11 PM

I dont know a lot about valves, but i do have GT40 heads on my car. The GT40P exhaust valves are slighty smaller than GT40 valves that i know. I dont know about the length though. Are your heads stock built? Could they have been re-done with different valves at some period?
The best thing to do is to find a good machine shop that does head work, they will know whats wrong.

pearlgt40 306 · 07-04-2003, 10:13 PM

they're stock heads, sadly...i was supposed to get them ported while the were off but that was put aside. machine shop is a good idea. thanks ill try on monday.

Coupe50h · 07-05-2003, 01:21 AM

You were going to flow unported gt irons

Well, mine are ported, and im still not all that happy with them, although my car makes decent power, i just thought id see a bigger improvement.
about the valve, i would just buy avalve for a 93-95 cobra, make sure the locks and reatiners are for gt-40's, cuz it seems they have weird retainers or something.
hope you fix it.

07-04-2003, 08:54 PM	#1
pearlgt40 306 Registered Member Join Date: May 2002 Location: Long Island, NY Posts: 14	valve problem ive run into a problem..took my heads off so my friend could bring them into class (we go to UTI) and flow them. During the flowing a mishap occurs...blah blah blah.....bent exhaust valve. I figure..no problem. hes buying me a new one. He does. Its the wrong valve.. the lock groove is higher on the stem than mine... and the valve itself is shaped a little differently.(better) Now we have a problem...according to ford motorsports the valve i bought can be used in gt40 cast iron or aluminum heads... obviously not. Could they have redesigned the valves since i bought my heads 3 or 4 years ago? So now im looking for a valve. 1.54" Gt40 iron/ exhaust valve. please help... i really need to get my car back on the road. The parts guy at the dealership where i got the valve and I cannot figure out why the new one would be different from what I have. __________________ 306 Short Block, Forged Pistons, GT-40 Irons, Ford Racing 1.6 Ratio Rockers, GT-40 Upper and Lower Intake, B-303 Cam, 24 lb Injectors, 70 MM Throttle Body, 75 mm MAF, MAC Cold Air Intake(in fender), March Ram Air Scoop, MAC Longtubes, Offroad H-Pipe 2.5", No Cats, 40 Series Flows, 2.73's(eek...), Kenny Brown Subframes, World Class T-5, Pro 5-0 Tower Shifter

07-04-2003, 09:11 PM	#2
TMASTER Registered Member Join Date: Sep 2002 Location: TEXAS Posts: 161	hmm I dont know a lot about valves, but i do have GT40 heads on my car. The GT40P exhaust valves are slighty smaller than GT40 valves that i know. I dont know about the length though. Are your heads stock built? Could they have been re-done with different valves at some period? The best thing to do is to find a good machine shop that does head work, they will know whats wrong.

07-04-2003, 10:13 PM	#3
pearlgt40 306 Registered Member Join Date: May 2002 Location: Long Island, NY Posts: 14	they're stock heads, sadly...i was supposed to get them ported while the were off but that was put aside. machine shop is a good idea. thanks ill try on monday. __________________ 306 Short Block, Forged Pistons, GT-40 Irons, Ford Racing 1.6 Ratio Rockers, GT-40 Upper and Lower Intake, B-303 Cam, 24 lb Injectors, 70 MM Throttle Body, 75 mm MAF, MAC Cold Air Intake(in fender), March Ram Air Scoop, MAC Longtubes, Offroad H-Pipe 2.5", No Cats, 40 Series Flows, 2.73's(eek...), Kenny Brown Subframes, World Class T-5, Pro 5-0 Tower Shifter

07-05-2003, 01:21 AM	#4
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	You were going to flow unported gt irons Well, mine are ported, and im still not all that happy with them, although my car makes decent power, i just thought id see a bigger improvement. about the valve, i would just buy avalve for a 93-95 cobra, make sure the locks and reatiners are for gt-40's, cuz it seems they have weird retainers or something. hope you fix it. __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

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