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Author
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Topic: 289 Motor Replacement
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swiss
Gearhead Posts: 185
From: Duluth, Ga
Registered: Feb 2004
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posted 02-23-2004 11:59 PM
   
Hello,I am going to replace my 289 motor in a 65 mustang convertible with a new 302 Ford Motorsports motor. The car has a T4 manual transmission. I have been reviewing all my options and for this daily driver I am looking at the new 302GT40 motor (either the M-6007-B31 M-6007-XE3) Looking at the motor options, I can get the motor with either the Y303 heads or the X303 heads. The book hp rating rating is 320 or 340. Questions:
1.) Is the X303 setup better? I believe that these heads will limit my intake choices
2.) Assuming my T4 is in good shape??? It is going to be reviewed later this week, am I overpowering the T4 with a 9" rear?
3.) From my research I am going to have to get a new damper, 2 piece fuel eccentric and flywheel.Plug the oil dipstick hole to use the new oil pan and oil pump assembly. Do I have to drill a new dipstick hole? I have seen others talk about drilling the timing cover.
4.) Intake, any recomendations on intake?
5.) I was going to get reproduction 289Hi PO headers for better flow?
6.) I have heard, Waterpump, Starter, Fuel Pump, Alternator are all existing 289 bolt on items. I am going to get a new distributor and switch to electronic ignition. Thanks Steve [This message has been edited by swiss (edited 02-24-2004).]
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BornInAFord
Gearhead Posts: 471
From: Bend, OR, USA
Registered: Dec 2002
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posted 02-25-2004 01:39 AM
quote:
Originally posted by swiss:
Hello,I am going to replace my 289 motor in a 65 mustang convertible with a new 302 Ford Motorsports motor. The car has a T4 manual transmission.
Did you mean a T5 5 speed manual as used in late model 5.0L stangs or a T10 or Toploader 4speed? quote:
1.) Is the X303 setup better? I believe that these heads will limit my intake choices
X303 heads are new alumimum heads and flow better than the Ys or GT40s. They will limit your choices a little, perhaps, but I think they should work with many of the Edelbrock or FRPP intake offerings. quote:
2.) Assuming my T4 is in good shape??? It is going to be reviewed later this week, am I overpowering the T4 with a 9" rear?
There are differences in T5 strength. Strongest are the 2.95 conversion ones from D&D (there are stronger ones with dog-tooth gears and no synchros, but you are driving street) and the FRPP "Z-spec" T5 transmissions which can handle over 300ft-lbs of torque. Next are the 90-93 T5s (300ft-lbs), then the 86 to 89 (265 ft-lbs), then the 84-85 non-"world class" transmissions, which are also rated at 265 ft-lbs, but don't have as long lasting blocker rings, etc as the world class ones. Note that these torque ratings are for continuous usage ratings. All T5s last longer with better lubricant (synthetic auto tranny fluid), shift stops, and no power shifts. Missed or over-traveled shifts and sudden clutch dumps at 5grand and keeping the engine floored between shifts is what kills the trannies. Something has to give, which brings us to the next issue, the rear end.
The rear end choice is up to you, but here are things to consider. The 8" weighs less, but is not as strong and you don't have as many rear end gear choices. For most street driving, you won't need to upgrade to a 9" as long as you get an upgraded 8" (with 4 spider and steel clutch faces in the trac-lock unit, and the post-67 stronger third member),and you don't power shift or dump your clutch at 5grand.  Something has to give, which brings us to the next issue, one of tires. If you are going to have something give, the tires are much cheaper to replace, and the less they grip, the longer your other components will last... 
Also, consider upgrading your clutch to a cable operated later model style with a diapragm clutch.
quote:
3.) From my research I am going to have to get a new damper, 2 piece fuel eccentric and flywheel.Plug the oil dipstick hole to use the new oil pan and oil pump assembly. Do I have to drill a new dipstick hole? I have seen others talk about drilling the timing cover.
No need to drill a dipstick hole if you use an early model front timing cover with the early v-belt setup and the early style water pump. Just plug the dipstick hole in the side of the late model block with a wood dowel or some sealant, or you'll have a leak... If you use a late model serpentine system and a late model timing cover, as long as you have a pre-1994, you can drill a hole in the timing cover where the early dipstick hole is.
quote:
4.) Intake, any recomendations on intake?
Not from me--are you planning on fuel injection? or carburetion? A 600-750cfm Edelbrock or Holley Double Pumper (750 might be more carb than you need, though) should work fine, with a Weiand Stealth or Edelbrock RPM dual plane.
quote:
5.) I was going to get reproduction 289Hi PO headers for better flow?
Cast iron Hi-pos will flow well, but not as well as some of the aftermarket equal length shorty headers. Fit is great, though, and it looks period.
quote:
6.) I have heard, Waterpump, Starter, Fuel Pump, Alternator are all existing 289 bolt on items. I am going to get a new distributor and switch to electronic ignition.?
If you use an early style timing cover, that is true for the most part, although I think you might have to change to a late model 2 bolt starter (with advantages of lighter weight). Make sure you get a steel geared distributor. Also, make sure you get the correct flywheel and harmonic damper (50oz).
It is late here, and I hope I've been accurate. If not, someone else please chime in.
Here is a link describing what you plan to do... http://www.gt350clone.com/50install.htm
Good luck on your project.
Daniel
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BornInAFord
Gearhead Posts: 471
From: Bend, OR, USA
Registered: Dec 2002
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posted 02-25-2004 11:02 AM
Oh, and WELCOME to M&M. Keep asking questions... do a search for more info, and enjoy your project! 
Daniel[This message has been edited by BornInAFord (edited 02-25-2004).]
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swiss
Gearhead Posts: 185
From: Duluth, Ga
Registered: Feb 2004
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posted 02-25-2004 06:04 PM
Daniel thanks for the post, it is amazing the amount of information that people have in their heads. I am enjoying reading all the posts and learning. The transmission is a Toploader 4 speed.
After about 20 hours of research and discussions I am leaning towards the M-6007-B51 engine with the Y303 heads to keep the engine more streetable. For others reading this you can purchase the new harmonic balancer and clutch bracket from Total Performance parts in Detroit. Phone number is Performance Parts 586-468-3710. This will allow you to use the older 289 pulley's and front end components.
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BornInAFord
Gearhead Posts: 471
From: Bend, OR, USA
Registered: Dec 2002
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posted 02-25-2004 11:02 PM
Steve, I don't think you will have ANY problem with a toploader handling the power as long as it is in good shape. Also, I would tend to agree with you in going towards more streetable. Again, good luck with the swap!
Daniel
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