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Home of the Whopper
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What to do with '65 Mustang with 10% leakdown
1965 Mustang coupe, C-code with 289 and a 2bbl carb
Just passed 100k miles. Had a slight stumble at low RPMs. Leakdown came back OK at 8 - 10%. Vacuum advance appears to be working properly. Decided to rebuild the carb just because. Bought the $12 rebuild kit and started the disassembly. In hind sight, should have checked dwell and timing, but too late now. While doing research for the carb rebuild, saw an article on an intake swap and 4 barrel carb install. Worth about 30hp. So... for just a little more money (~$700), instead of rebuilding the 2bbl, I can get a brand new 4bbl and add 30hp. Or... since most of the leakage was through the valves, for a little more money I can go with aluminum heads. And since I am going there, why not cam it too?  Is any of this worthwhile with a 100k engine with 10% leakdown? Thinking of doing the 4bbl now, and save the rest for the engine rebuild?
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1968 912 coupe 1971 911E Targa rustbucket 1972 914 1.7 1987 924S |
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10-04-2018, 05:49 AM
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Join Date: Jun 2007
Location: Lake Oswego, OR
Posts: 6,039
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Rebuild the 2 bbl.
Tune it. Drive it. Enjoy it. If once it drive well and you want to hot rod it, then do it. I had horsepower dreams with my SC at first. Now? I love it as stock. |
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10-04-2018, 05:52 AM
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Join Date: Mar 2008
Location: Fla panhandle / Roaming in my motorhome
Posts: 4,332
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Now that there is a classic Pelican "while we are in there " list.
I doubt you will get much pushback from here. Pics of the stang please. Cheers Richard |
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10-04-2018, 05:54 AM
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Banned
Join Date: Jan 2005
Location: cutler bay
Posts: 15,141
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headers +duels give the most power per $$$ on a 289
holly is the carb |
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10-04-2018, 06:40 AM
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tune port injection crate motor.?
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poof! gone |
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10-04-2018, 06:46 AM
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Snark and Soda
Join Date: Aug 2003
Location: SF east bay
Posts: 24,561
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Supercharger.
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Good post? Leave a tip! O - $1 O - $2 O - $3 |
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10-04-2018, 06:58 AM
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Home of the Whopper
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Youre not helping Vash!
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1968 912 coupe 1971 911E Targa rustbucket 1972 914 1.7 1987 924S |
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10-04-2018, 07:08 AM
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Quote:
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poof! gone |
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10-04-2018, 07:12 AM
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to be real.. kudos on the carb rebuild.
i sucked..i dont think i ever got a rochester run right if it went thru one of my rebuilds. i could only do Holleys..which to be honest, i think my mom could do.
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poof! gone |
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10-04-2018, 07:13 AM
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Join Date: May 2002
Location: Morrison, Colorado
Posts: 634
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I'd do the 4 BBL, when you stomp on it and the secondaries kick in you will smile broadly and bask in the knowledge you made the right decision.
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96 993 Cab, 73E Targa, 72S Targa |
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10-04-2018, 07:24 AM
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Join Date: Oct 2006
Posts: 1,484
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Well, after all the mods, port/polish/cams/Holley/headers/Edelbrock, you will have to turn the motor off when gassing up as the pumps will not be able to keep pace with the motor at idle.
The main reason to just get it running now is because the car won't turn and stop well enough to handle the increase in power with all the mods. A 9 inch rear end with disc brakes from a Lincoln bolts right on, repro style steel wheels look great and can handle decent tires. Set of 4 good shocks with all the above turn the car from a deathtrap into something you can drive without gripping the wheel to the point of cramp. All of the above should run less than $2k. But if you want to wake up a 289 in a straight line a set of headers is the biggest bang for the buck. Cam not so much and too much cam ruins the car completely. Honestly, the best bet is to look at the specs for a Shelby GT 350 and duplicate it, Ol Carroll knew a few things. |
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10-04-2018, 07:46 AM
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Join Date: May 2004
Location: Lake Cle Elum - Eastern WA.
Posts: 8,416
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In high school, I had the 289 with 4 barrel in my sporty Falcon Sprint........It made a great 1st car....
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Bob S. 73.5 911T 1969 911T Coo' pay (one owner) 1960 Mercedes 190SL 1962 XKE Roadster (sold) - 13 motorcycles |
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10-04-2018, 08:08 AM
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Quote:
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. |
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10-04-2018, 08:12 AM
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Join Date: Apr 2001
Location: Linn County, Oregon
Posts: 48,494
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while you're in there
https://www.edelbrock.com/shop/crate-engines.html?find=1965-ford-mustang-base-260cid--4-3l--v8-43331
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"Now, to put a water-cooled engine in the rear and to have a radiator in the front, that's not very intelligent." -Ferry Porsche (PANO, Oct. '73) (I, Paul D. have loved this quote since 1973. It will remain as long as I post here.) |
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10-04-2018, 08:13 AM
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Get off my lawn!
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Yea, a nice LS7 is cheap, or spend big bucks and go for a Ford Coyote engine.
Leave it stock, drive it, enjoy it.
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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10-04-2018, 08:37 AM
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Join Date: Feb 2008
Posts: 18,631
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I would go 302 route....
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dolor et pavor Copyright |
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10-04-2018, 08:51 AM
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Join Date: Aug 2002
Location: MD
Posts: 5,733
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coyote or nothing!
My first car was a similar 289/2. It woke up a bunch with a different intake, carb and exhaust. Valve springs were shot so it just got louder past ~3500. 10% leakdown wouldnt concern me one bit. If you just want to tool around, just fix what you have and drive it. The slope is slippery but affordable once you upgrade. Soon you'll NEED a cam, different gears...
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10-04-2018, 09:19 AM
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Join Date: Oct 2006
Location: Cincinnati
Posts: 672
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Yes, just rebuild the 2 barrel and add headers/glass packs. It will be simple and sound good.
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Chris 1974 Porsche 911 Targa w/935 flat fan twin turbo motor, not really "DTW" Dave W. "There is really not any such thing as a rebuild 'on the cheap' on a 2.7 motor. You'll either pay now, or you'll pay later, but you'll pay." |
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10-04-2018, 09:30 AM
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Get off my lawn!
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The biggest issues with more power, well yer gonna need more brakes. And a drive train upgrade. With lots more power a limited slip rear end. Maybe a different rear end ratio, and of course bigger wheels and tires, and then some nice tubs or flairs. And some spoilers, and might as well paint it. And then......
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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10-04-2018, 09:33 AM
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Join Date: May 2017
Posts: 15,530
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10% is no biggie. Drive it.
I would keep it mostly period correct. Rebuild the 2 barrel or add Edlebrock, Holly, and a set of tri y headers to get 240 to 250 hp. Cragers or styled steel wheels and you are up town. I wouldn't mess with the aluminum heads. I have had a k code fastback in the past. Poppy red. It was a ton of fun. |
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10-04-2018, 09:39 AM
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Olive
The Turtle
Ruby
Brownie
Carrera
