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Old 06-08-2010, 12:37 AM
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I need a 700r4 converter stall recommendation

I am going to be installing a 700r4 out of a '91 corvette in my '65 C10 soon. It will be installed along with a newly built 350 sbc that will be putting out 350-375 hp which has a Comp Cams XE262H cam with the following specs:

Hydraulic flat tappet
Basic Operating RPM Range 1,300-5,600
Intake Duration at 050 inch Lift 218
Exhaust Duration at 050 inch Lift 224
Duration at 050 inch Lift 218 int./224 exh.
Advertised Intake Duration 262
Advertised Exhaust Duration 270
Advertised Duration 262 int./270 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.462 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.469 in.
Valve Lift with Factory Rocker Arm Ratio 0.462 int./0.469 exh. lift
Lobe Separation (degrees) 110

This will be a street driven truck with 3.73 gears in the rearend and I will be running 28" tall rear tires. Please recommend a stall speed for the lock-up converter that I will be ordering.

Thanks,

Derek

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Old 06-08-2010, 01:35 AM
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Around 2400-2600 stall.
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Old 06-08-2010, 07:26 AM
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that mild of cam shaft will work with a stock converter out of the Corvette
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Old 06-08-2010, 09:29 AM
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Quote:
Originally Posted by Crosley
that mild of cam shaft will work with a stock converter out of the Corvette
I pulled the code off of the stock converter and I believe it only has a stall of 1400 rpm. I am sure it would probably work but I am looking for a recommendation as to the best stall for my setup and intended use.

Thanks for the input so far
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Old 06-08-2010, 08:35 PM
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Quote:
Originally Posted by dlisabeth
I pulled the code off of the stock converter and I believe it only has a stall of 1400 rpm. I am sure it would probably work but I am looking for a recommendation as to the best stall for my setup and intended use.

Thanks for the input so far

then it is not a corvette converter and I stand by my suggestion of a stock converter.

375 hp from that engine with that camshaft? Not gonna happen, unless you run the compression up and have some good heads, you may get close.

Stock converter will work fine with that little cam
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Old 06-08-2010, 09:15 PM
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Depends on what you want it to do.
I think a stock converter will get you off the line without smoking the tires off of it and that cam starts really pulling once you're through the intersection. All in all, it will put that engine off the line almost as fast as a higher stall, with no damage to the transmission. I have a 3000 stall laying in the shop that would get it moving faster but I'm burnt out on converters, and if you don't live up the street and come get it for free, it's going to Industrial Salvage the next time I junk something.
Since I started building 700r4s a couple years ago I've seen several come in with burnt smelling fluid, and half the time, they had high stalls. A corvette converter is as far as I would go, myself.

But take my advice in this matter with a grain of salt. I'm still bitter about burning one of my own new builds with a bad high stall. Oil cooler was putting off like a wood heater. and now I'm afraid of that 3000 I bought on Ebay at the same time...
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Old 06-09-2010, 12:55 AM
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Quote:
Originally Posted by Crosley
then it is not a corvette converter and I stand by my suggestion of a stock converter.

375 hp from that engine with that camshaft? Not gonna happen, unless you run the compression up and have some good heads, you may get close.

Stock converter will work fine with that little cam
The engine has flat top pistons, a zero decked block and 9.1:1 CR with world product heads. I am also running an Edelbrock RPM intake, 600cfm carb, and shorty headers. This combo was right around 375hp on Dynosim.

Here is a photo of the label on the converter out of the 1991 Corvette. After some decoding this tells me that it is a 1985 or later 700r4 converter with a stall of 1397rpm and 3 square lugs for the flexplate bolts.

I think I am going to look for a stock converter out of a 4.3l Blazer which has a stall of 2075rpm. The 1397rpm just seems like it will be too low.

Any thoughts on the s-10 converter versus the one I have now?
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Old 06-09-2010, 01:47 AM
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converter

How big are the intake ports on those World Products heads? Also I assume 2.02/1/6 valves?

And yes, the converter you're talking about works great. They're hard to find. Duntov

Last edited by Duntov; 06-09-2010 at 01:50 AM. Reason: forgot something
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Old 06-09-2010, 03:53 AM
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I'm sure Crosley and Duntov were taking it into consideration, but I'll put it out there... First gear in a 700r4 is something like 21% lower than a TH350 right?

It seems to me like you've got a motor that will produce a healthy amount of low rpm torque. That should be really fun on the street but when you combine it with 3.73 gears, the 700r4's low first gear, and a loose converter, it sounds to me like a recipe for tire smoke every time you launch. My suggestion is in line with the others offered... Since you already have it, it costs you nothing to try the stock converter. If you're happy with it, you've saved the cost of a high stall. If not, then you're out nothing but the time it takes to r&r the converter later.

Tony
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Old 06-09-2010, 09:30 AM
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converter

I agree with TonyZ...... I didn't think to mention that a 700 has a super low first gear.
If you're accustom to a 700r4 you know it's nearly impossible to leave a stoplight under full throttle without smoking the tires off your truck, with a 305, and to a lesser degree even a 4.3. The possible exception being a 2.8L < which really, really needs the 3.06/1 first gear ratio, but they don't come in real trucks. I think your engine combo would benefit from the stock converter; Matter of fact, I think if you NAIL it when the light changes, you'll still lose traction. If that happens your RPM will hit 2000(More tire smoke) before you clear the intersection. The guy next to you with same engine build and high stall will probably beat you through the intersection, but so will the guy on the other side of you with the 4.3 v6. ( this is a 3 lane intersection )

OH WOW, I was running the video in my head, hence the 3 lane. It's in Greenville SC!... Sorry The guy with the converter beat you by two lengths in the 1/8th.
Of course his fluid got 70 degrees hotter than yours.. Everyone should run a converter once Have a good day.......... Duntov

Last edited by Duntov; 06-09-2010 at 12:09 PM. Reason: spelling
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