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Discussion Starter #1
OK, I have been a member of this forum for years and have stayed loosely in touch by dropping in every once in a while. The time has finally come when I can start working on the old cat again. I have owned my 69 XR7 vert since 2003. I was able to do several things in the first few years, rebuild the 351W, put in an AOD and get the interior about 90 percent done. It is driveable, but it still needs many things.
I got two kids through college and had to put pretty much everything on hold till they got done. Now it is time for some fun. One of the areas that needs some attention is the rearend. I would be willing to bet it still has the original lube in it and it is starting to whine when coasting. So I am going to pull it and go through it. After cleaning it, replacing axle bearing and seals, I want to add a posi with a better gear ratio than 3.00. Since gas mileage isn't a concern and I would like better performance, what gear ratio would be best? I am think 4.11 would be a blast to drive and still be reasonable on the highway with the AOD. Maybe one of you guys on here has some experience to share before i go off buying parts? Anyway, it is time to finish what I started 15 years ago. Looking forward to being on the forum more often now.
 

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If your AOD has the typical .67 overdrive, then 4.11s will feel like 2.75s in 4th. That's a substantial jump from the 2.01:1 you get with the 3.00s, but should still be very livable.
 

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Discussion Starter #3
The 4.11's have been installed for a while now. Nice to see two black stripes on the road instead of just one. I figured that going with 4.11's and a posi would be a real tire fryer, but you have to power brake it to get a good burn out. Fun to be so juvenile!
Next up are some more performance upgrades. Thinking roller cam, aluminum heads, roller rockers and a Performer RPM intake. Stay tuned!
 

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Are you talking about a retro fit roller cam? If so, you will want to research some issues that some people have had with a "small base circle" cam...I too, have been working on my 69 now for far too many years.....I bought a set of trick flow heads, before I had the rest of the build planned, and looking back, I made a poor choice, as it limited the amount of lift I could run, with out cutting my pistons.
Also, if you are thinking about an air gap intake manifold, hood clearance will be an issue! I had already cut a hole in my hood, otherwise it would not have fit. What size of tire are you running in the rear, and what is your RPM at 70 mph with the 4.11's? I have a 3.89 in my 69, and will probably either stick with the 245/50/16's that are on it, or maybe go to a more traditional 15 inch rim. That's Something I am still working out...
Having the 4.11's already though, gives you a LOT more choices for a performance camshaft though!
 

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This makes me wonder Small circle roller cam wise .. if anything new new and great has come out since i built mine back in mid 2000. ? Hell i would have to go digging just to fresh my memory of exactly what i put in... I sure it was a Comp cams Xtream or Magnum.. 1800 plus rpm as i remember doing the AOD torque converter and rear gear research to put the package all together.. What ever you decide to do take your time and research your whole package before you purchase anything.
 

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Discussion Starter #8
I am probably going to use a roller cam that ties two lifters together with a bar which eliminates having to use a "small base circle" cam. This is the cam I am looking to use: https://www.summitracing.com/parts/cca-sk35-442-8
Also thinking of using the Performer RPM intake that I picked up cheap so I don't have to cut a hole in a rust free hood. Do like the look of the Eliminator hood scoop with a chin spoiler! I am using a 245/45/17 on the back. It spins the motor at 2400 rpm running 70 on the highway. I got a steal on one Performer RPM head that was used as a display and I now looking for the second one when someone runs a sale.
All summed up, Performer RPM heads, intake, Comp Cams roller cam with Holley Sniper fuel injection. Hoping for HP in the 400 range.
 

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I don't know if anyone on here still has the desk top dyno calculator, but that sounds like a solid build! I think 400 HP at the flywheel will be no problem.
 

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Discussion Starter #13
Here are the specs for the Howard Roller Cam I am looking to use. I also want to step up to a 2200 RPM stall converter. Good cam for my application?
 

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Discussion Starter #14
Whoops, didn't add the specs.

Make: Ford






Engine: 221-302 / 351W






Camshaft Type: Hydraulic Roller






Basic RPM Range: 1000 to 5000






Valve Lift Intake: .517






Valve Lift Exhaust: .517






Duration Intake: 266






Duration Exhaust: 272






Duration at 050 Intake: 213






Duration at 050 Exhaust: 219






Lobe Separation: 112






Intake Centerline: 108
 

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That looks like an excellent grind for a street driven Cougar with automatic transmission. It is a lot bigger than a stock cam, but has short duration and 112 LSA so you will still have enough vacuum for power brakes and the headlights.
 

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Discussion Starter #16
It looked like it would be a good all around street cam, but it's nice for someone to chime in and validate what I was thinking. I would like this to be an honest 400HP combination that has some ass to it when you decide to use the load pedal. Hoping to get this moving over the winter months after the holidays.
 
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