99gt heads for a 98gt

08-31-2000, 11:00 AM

How much does it cost to switch for 99gt heads on a 98gt. What power can you expect with the switch. Will it create more power for my 98 than the 99-00 have. What if I do some head work on them first.

cravnpup · 08-31-2000, 12:34 PM

I don't know about cost, but you can probably expect about 30-40hp from the head swap alone, which won't put you on top of the 99-00GT's. If you were to add the FRPP Intake that goes with the head swap, you'll probably end up with 270-280 bhp, which is more than the new GT's. If you had some head work done plus the intake you'll see more, but will probably have to upgrade the fuel system as well to take advantage of the increased flow.

------------------
2000 GT Conv. 5speed
Triple Black
Current Mods: K&N, Mobile 1
ET: 14.6@99.8 (Bogged)
Upcoming Mods: BBK Longtubes, BBK H-pipe w/cats, MagnaFlow Cat-Back, and much much more

SMOKE · 09-01-2000, 08:21 AM

Part Number Description Price Quantity P*Q
XL3Z-6049-HA head 273.00 1 $273.00
XL3Z-6049-GA head 273.00 1 $273.00
XR3Z-9424-DA intake 182.00 1 $182.00
XL3Z-6582-AA valve cover 53.00 1 $53.00
XL3Z-6582-CA valve cover 59.00 1 $59.00
XL3Z-9439-AA intake gasket set 5.00 1 $5.00
XR3Z-6051-BA head gasket 20.00 1 $20.00
XL3Z-6051-BA head gasket 20.00 1 $20.00
F5AZ-6065-A head bolts 2.50 20 $50.00
F8AZ-9448-AA LH exhaust gasket 4.50 2 $9.00
F81Z-9448-AA RH exhaust gasket 11.00 1 $11.00
BE ADVISED, YOU MAY NEED TO OBTAIN A 99 SPEC WATER PUMP TO USE THE NEW STYLE HEATER HOSE! IF YOU CANNOT DO THAT, A LENGTH OF STANDARD RUBBER HEATER HOSE WILL WORK. Im running the rubber hose on my car and it has a kink in it near the waterpump, Im not to comfortable with kinks in my cooling lines.

Also, a new oil pan and timing cover gaskets are not mandatory, but reccomended.

This part was on the old list ----N806300-S2 new front cover studs 1.82 8 $14.56-----IT IS INCORRECT!!! Fords parts computer system continues to mistakely list these 8mm bolts for the 99-00GT. I had to do a parts check for a 99 F150 5.4L truck to obtain the correst stud #'s. I appologize for any inconvinience Ford has caused us. You should be able to swap your parts with Ford even if they are opened due to their fugg up.

You will need the following new front cover studs and bolts. You will need 6 studs p/n N808142-S309, about $2.00@, you will also need 2 bolts p/n N808140-S309

found this on the corral .... Search for "99 HEADS" or by name "PAUL99GT".
SMOKE

SMOKE · 09-01-2000, 08:33 AM

The guy who performed the swap into Crown Vic had it dynoed and tested at the track. Seat of the pants meter ran good.
Dyno showed 30 rwhp gain. Not bad for a $1000 investment in parts.
99 GT headswap 190rwhp/230rwtq -
headswap tuned 220rwhp/250rwtq -
SMOKE
98 Stage 2 ROUSH withoput the side exhaust

08-31-2000, 11:00 AM	#1
Eminent18 Guest Posts: n/a	99gt heads for a 98gt How much does it cost to switch for 99gt heads on a 98gt. What power can you expect with the switch. Will it create more power for my 98 than the 99-00 have. What if I do some head work on them first.

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08-31-2000, 12:34 PM	#2
cravnpup Registered Member Join Date: Aug 2000 Location: Torrington, CT, USA Posts: 145	I don't know about cost, but you can probably expect about 30-40hp from the head swap alone, which won't put you on top of the 99-00GT's. If you were to add the FRPP Intake that goes with the head swap, you'll probably end up with 270-280 bhp, which is more than the new GT's. If you had some head work done plus the intake you'll see more, but will probably have to upgrade the fuel system as well to take advantage of the increased flow. ------------------ 2000 GT Conv. 5speed Triple Black Current Mods: K&N, Mobile 1 ET: 14.6@99.8 (Bogged) Upcoming Mods: BBK Longtubes, BBK H-pipe w/cats, MagnaFlow Cat-Back, and much much more

09-01-2000, 08:21 AM	#3
SMOKE Old School ROUSH Join Date: Nov 1999 Location: Stockbridge, GA Posts: 531	Part Number Description Price Quantity PQ XL3Z-6049-HA head 273.00 1 $273.00 XL3Z-6049-GA head 273.00 1 $273.00 XR3Z-9424-DA intake 182.00 1 $182.00 XL3Z-6582-AA valve cover 53.00 1 $53.00 XL3Z-6582-CA valve cover 59.00 1 $59.00 XL3Z-9439-AA intake gasket set 5.00 1 $5.00 XR3Z-6051-BA head gasket 20.00 1 $20.00 XL3Z-6051-BA head gasket 20.00 1 $20.00 F5AZ-6065-A head bolts 2.50 20 $50.00 F8AZ-9448-AA LH exhaust gasket 4.50 2 $9.00 F81Z-9448-AA RH exhaust gasket 11.00 1 $11.00 BE ADVISED, YOU MAY NEED TO OBTAIN A 99 SPEC WATER PUMP TO USE THE NEW STYLE HEATER HOSE! IF YOU CANNOT DO THAT, A LENGTH OF STANDARD RUBBER HEATER HOSE WILL WORK. Im running the rubber hose on my car and it has a kink in it near the waterpump, Im not to comfortable with kinks in my cooling lines. Also, a new oil pan and timing cover gaskets are not mandatory, but reccomended. This part was on the old list ----N806300-S2 new front cover studs 1.82 8 $14.56-----IT IS INCORRECT!!! Fords parts computer system continues to mistakely list these 8mm bolts for the 99-00GT. I had to do a parts check for a 99 F150 5.4L truck to obtain the correst stud #'s. I appologize for any inconvinience Ford has caused us. You should be able to swap your parts with Ford even if they are opened due to their fugg up. You will need the following new front cover studs and bolts. You will need 6 studs p/n N808142-S309, about $2.00@, you will also need 2 bolts p/n N808140-S309 found this on the corral .... Search for "99 HEADS" or by name "PAUL99GT". SMOKE*

09-01-2000, 08:33 AM	#4
SMOKE Old School ROUSH Join Date: Nov 1999 Location: Stockbridge, GA Posts: 531	The guy who performed the swap into Crown Vic had it dynoed and tested at the track. Seat of the pants meter ran good. Dyno showed 30 rwhp gain. Not bad for a $1000 investment in parts. 99 GT headswap 190rwhp/230rwtq - headswap tuned 220rwhp/250rwtq - SMOKE 98 Stage 2 ROUSH withoput the side exhaust