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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 02-16-2011   #1 (permalink)
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Default 1965 Mustang 260 V8 Upgrade Options

Hello,
I am hoping to get some new ideas for upgrade options for my 1964.5 260 V8. I have taken her up to about 50 MPH and I cant imagine her going much faster. She doesnt seem to have much left. I would like to think that someday I would be able to take her on short road trips on highways.
Here are the pertinent stats:

260 V8 engine
T 150 3spd Trans
8'' Rear axle with 300 gears

Only upgrades to date: Pertronix ignition system

I have though about dropping a newer 5.0 in or a 289 in while I tinker with the old 260 but if there are upgrades/mods I can do to make the 260 better, I would like to explore that option. I am not concerned with keeping her stock and I will be upgrading exhaust, 15'' rims/tires and putting newer suspension on in the next year.

Thank you for your help and insight.
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Unread 02-16-2011   #2 (permalink)
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if you are going to upgrade to a 302 make sure it is a 87-93 roller motor
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Unread 02-16-2011   #3 (permalink)
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Most of the small block fords benefit from a dual plane aluminum intake and four barrel carb, I wouldn't go any bigger than a 470-500cfm, the 3.0 rear axle will be okay. It should run past 50 mph easy. Check your dwell and initial ignition timing, vacuum advance, and that the mech ignition timing is free to move, most people don't know to put a few drops of oil in the opening under the rotor in a ford dist. Check your spark plugs and gap, the plug wires. Dual exhaust will help. It might be time to overhaul the motor, do you know how many miles are on it? And if it is ready for a rebuild you might want to consider a 289 or 302 to rebuild. Good Luck.

Last edited by rex1965; 02-16-2011 at 11:10 PM. Reason: more info
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Unread 02-16-2011   #4 (permalink)
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One thing to keep in mind is that your block only uses a 5 bolt bellhousing so you will need to upgrade that with any engine newer than 65. The later blocks use a 6 bolt pattern that is not interchangeable with the older 5 bolt. Hang on to your 5 bolt stuff in case you run into someone looking for the old block for a resoration.
You could put a stroker kit in to the 260 using the 289 stroker crank but pistons may be a problem due to the smaller bore.
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Unread 02-16-2011   #5 (permalink)
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First find out why your 260 is not performing. A 260 is really not much differant than a 2v 289. As mentioned ck mechanical and vac advance in distributer. plugs, wires, timing and while the plugs are out do a compression test.
fuel pump pressure, vacuume leaks.

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Unread 02-17-2011   #6 (permalink)
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Thanks for the input. The old 260 only has 14K original miles but it sat for years in a garage and was neglected (service wise) while my Grandfather drove it (once a month tops for 15 years in summer). Ideally I would like to figure out how to get more out of what I got. At what point do you decide that a motor is ready for a rebuild? What measures are used to make that decision? What should the compression be= normal?

I have recently replaced the plugs, but im sure I will need to put new plug wires on in the near future. Thank you for your patience and insight.
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Unread 02-17-2011   #7 (permalink)
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The cars and engines need to be driven, stuff will corrode and/or get stuck, such as brake pistons, parking brake cables, piston rings, plus warming them up and driving them produces heat, which helps dry them out. My rule of thumb for a rebuild, is if there is a lot of blow-by like out the breather cap, low oil pressure or engine knocking (excessive bearing clearance), low power (loss of compression) which also causes poor fuel economy, fluids leaking everywhere, gas,oil, antifreeze (gaskets hard and cracked and/or expansion plugs leaking). Good Luck.
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Unread 02-17-2011   #8 (permalink)
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I can't imagine that a 260 Mustang with 3.00 gears couldn't top 100 MPH. There has to be something wrong with yours. Veronica drives one; I can't see her piddling down the freeway at 50!

Just pulled out a Car & Driver road test from May 1964. The road tested top speed of the new Mustang was: 260 w/ automatic 105, 289 w/ 4-speed 110 MPH. You don't need a new engine, you need to fix the one you have. With 14k original miles that is a fairly rare find these days.
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Unread 02-17-2011   #9 (permalink)
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Yes I think you are right. Rare indeed. It just sat for years in a garage without being started. It does leak from the rear main seal and what I think is the oil pan, and it also needs a new clutch (from oil blowing on the clutch Im sure). Im working on ordering a new clutch and will put that in when I get home. I have read alot of people like centerforce but i may just go with a stock Sachs or Luuk or whatever is cheaper. Im just cruizin not racing for sure.

Is this rebuild something I can do in my garage? What is the best kit (piston, rings, gaskets, etc) and does anyone have a 260 engine rebuild write up?
Thanks again for the help. I have minimal experiance but I am learning

Thanks
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Unread 02-17-2011   #10 (permalink)
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If it's only got 14k on it, it's extremely unlikely to need a rebuild. You can replace the rear main seal with the engine in the car. Use a neoprene seal, and make sure you take the nail out of the cap or you'll ruin the seal. For the rest, just do the entire routine maintenance list all at once. The brake cylinders are probably trash. Count on needing to replace most of the brake system. You don't wanna die saving a few bucks. If you do the work yourself, the brakes can't cost a whole lot.
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