Beefed up My six, need more power to the Rear

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Wcalmt

Wcalmt

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Okay I've taken my 225 Slant 6, Bored .60, Head milled 0.100, With Clifford Performance Torq-er cam, and Twin Weber 38's intake, and headers.

Still same 727 trany, and stock rear-end, I don't think I'm getting the power that it's supposed to have though to the Tires/Road.

Thinking of getting the Transmission Rebuild and Shift-kit installed, and need a better 3rd Member...Any Suggestions?
 
My thought would be a lighter 904 trans, what rearend are you running, sometimes less is more :glasses7: are the webers feeding the system you have well enough :coffee2:
 
I think you would be better off with a 4 barrel carb like 500cfm edlebrock carb and a 904 or 4 speed trans i think the 727 robs 20 horsepower from the drivetrain not sure thought also make sure you have good gears 3.55 or even 3.23 you will get better torque with lower gears verse the 2.76
 
Where was the cam installed?
 
Probably not and that means there's a high probability that's where the issue lies.
 
I might get schooled here.... but I was always under the impression that slants only came with a 904 not a 727. In truck applications maybe???
 
Also, I would say that there is something definitely wrong with your tune. But then again I don't know if your basing this whole lack of power thing on the fact that your comparing this hopped up six to a hopped up smallblock? Are you just not having your expectations met?
 
alpha13 said:
I might get schooled here.... but I was always under the impression that slants only came with a 904 not a 727. In truck applications maybe???
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They came with 727s too. There was a slant specific 727 and also an adapter plate that adapted a big block transmission to them.
 
How about a quality 9.5 dynamic or more affordable PTC from Mr. John Cope tranny shop! This can get your power transfer going out back nicer!:burnout:
 
Thanks RUSTY! You learn something new every day. I'm going to have to do more research on that topic. Anyway back to the question. I went over some of your older posts. You don't seem to be updating them. ( at least the ones I read). Does this mean that those problems are solved? Or does this mean we are just chasing a bunch of things that could be wrong? I'm not trying to be rude AT ALL, apologies if I'm coming off that way. Did you get your ignition fixed? How about the kickdown linkage situation? Without the proper adjustment on the kickdown you could burn up the trans right quick! It will feel like a lack of power only because it's slipping.
 
RustyRatRod said:
They came with 727s too. There was a slant specific 727 and also an adapter plate that adapted a big block transmission to them.
Click to expand...

Rusty, I believe it adapted small block transmissions instead of B/RB. That was a truck/van only item in the 60s, the slant specific 727 came in later trucks, taxis, police cars etc.
 
alpha13 said:
Thanks RUSTY! You learn something new every day. I'm going to have to do more research on that topic. Anyway back to the question. I went over some of your older posts. You don't seem to be updating them. ( at least the ones I read). Does this mean that those problems are solved? Or does this mean we are just chasing a bunch of things that could be wrong? I'm not trying to be rude AT ALL, apologies if I'm coming off that way. Did you get your ignition fixed? How about the kickdown linkage situation? Without the proper adjustment on the kickdown you could burn up the trans right quick! It will feel like a lack of power only because it's slipping.
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Throttle, and kickdown have been fixed, Lokar cable, she starts great, a little cold hearted if it's been sitting fit a little bit.
 
I have a seen slant 904 ( and i'm thinking 727 also??), long tailshaft, trunnion tailshaft trannys. don't know what it came from though.

I know the A100 was different.
 
If you still got the 2:45 or 2:76 rear gears in there, all the carbs, cam, and headers in the world won't help till above 40 mph..

A 3:55ish gear set would be more suitable in this application, jmo

cheers
 
inertia said:
If you still got the 2:45 or 2:76 rear gears in there, all the carbs, cam, and headers in the world won't help till above 40 mph..

A 3:55ish gear set would be more suitable in this application, jmo

cheers
Click to expand...

I do agree. I don't know the specs on your cam but if it's got some decent overlap it could be killing your low speed torque. But then we get back to what centerline was the cam installed at?
 
I don't know anything about the Webers, but since you already have them & the intake you probably want to keep that. I would be leaning towards the 390 CFM Holley unless you're twisting ungodly RPMs. At six grand, a 230 inch engine is going to pull 399 CFM if it's capable of 100% efficiency. At 83% efficiency, it's capable of 330 CFM. I tend to like a strong Venturi signal.
I am with everybody else on the gearing. And other than the fact you already have it, I would probably be looking for a 904 or 4 Spd, less parasitic drag and less weight to haul around.
 
My slant was beefed up by Doug Dutra. We used his smaller spec'd cam and a 350cfm Holley. It wasn't until I dialed in the distributor with significantly more initial timing ( like 22*), but with only 32* total that it really came to life. It would burn the tires with 2.97 gears and a 904.

The timing was sorted using the standard vacuum gauge technique. Once it was all done and running great, I decided to pull it one day, sell it and put a junkyard 5.9 Magnum in it with EFI.

I was just tired of the slant. Now I have a 408 that gets better mileage and has just south of 500 hp.
 
Wcalmt said:
Okay I've taken my 225 Slant 6, Bored .60, Head milled 0.100, With Clifford Performance Torq-er cam, and Twin Weber 38's intake, and headers.

Still same 727 trany, and stock rear-end, I don't think I'm getting the power that it's supposed to have though to the Tires/Road.

Thinking of getting the Transmission Rebuild and Shift-kit installed, and need a better 3rd Member...Any Suggestions?
Click to expand...

Well think about it;The stock rating was 145hp. What were you expecting?

The tranny work you are contemplating will not amount to anything, in the power dept.
Whereas a higher stall TC and gears will.They won't make any power, but they will allow the engine to spin up both quicker and higher where the new torque curve is.
Then the rest is in the tune.And a generous weight-loss program.
I once was, where you now are.
 
Actually, the higher stall TC and gears DO make more horsepower,by
virtue of torque multiplication they automatically increase horsepower by extension.So
there is a REAL change in horses at the wheels.The biggest bug in his program engine
wise, the way too-small valves.If you're not willing to step up to at least adequate size
valves,you'll be peeing in the wind looking for more push in the seat,period.
The TF727 was available in the /6 case for fleet & taxi cars,and the tks
of course.I have a TF727 trans from a /6 B100 SWB van, don't recall the year,but I had
picked up a 10" B&M TC & a Transgo kit for it. Unfortunately the car wasn't up to much
more service body wise,and required more surgery than I could justify,so that was the
end of the project at the time.Probably just as well,would've been quicker w/a 904 set
up right anyway,so there the 727 sits in the basement.......
 
we pulled a 170 out and dropped a 225 into a buddies slant as it couldnt get out of its own way on even the slightest inclines. No change. Turned out to be a 2.45 rear end! What a dog.
 
Brandon Weaver said:
Rusty, I believe it adapted small block transmissions instead of B/RB. That was a truck/van only item in the 60s, the slant specific 727 came in later trucks, taxis, police cars etc.
Click to expand...

Was it the small block trans? Ok. I knew it was one or the other. Thank you drive through.
 
Where was the camshaft installed?
 
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