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Old 07-21-2009, 04:14 PM
powerrodsmike's Avatar
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stall speed reccomendation

A friend of mine is asking what stall speed he should run in his Model A roadster pickup.

here's the specs:
350 chevy
10.0:1 comp.
magnum 280 h cam (230* @ .050" .480 lift...in & ex) 110* LCA.
292 turbo heads ( some nascar thing)
750 holley
holley "contender" manifold (holleys version of a z-28 manifold)
shorty headers 1 5/8 tube
3.0 gears
turbo 350

This car weighs about 2000-2200#


The comp cams catalog tells us that it needs a stall converter, headers and gears, but gives no rpm reccomendation.

The 3.0 gears will probably stay, maybe he'll go to a 3.50 .
This car is just a cruiser, but supposedly it had a 2000 stall in it before and it crept so bad at stoplights that you had to stand on the brakes...stopped on a slippery floor it would sit and slowly churn the tires at an idle.

Thanks for reading this,
later,
mikey

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Old 07-21-2009, 04:47 PM
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That cam should work fine with a true 2000-2500 convertor. I sell a lot of those cams and most engines are actually borderline for a higher convertor with that cam.
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Old 07-21-2009, 04:59 PM
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Because of the low weight of the rod, you are going to have to buy an "off the shelf" 3000-3400 rpm "rated" stall to get a "true" 2500 rpm stall, unless you go to a converter company and have one custom built for the combo. If you buy a cheap off the shelf 2500 stall you will be lucky to get 1800 stall out of it.
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Old 07-21-2009, 05:14 PM
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I would recommend a quality, "tight" 10-inch converter. These will usually be rated (for a SBC) at around 2800-3200 RPM, but given the weight of his rod, the stall wouldn't be that high- it'd likely be closer to 2200-2400 RPM.
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Old 07-21-2009, 06:48 PM
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I would go with a 2800-3000 stall...
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Old 07-21-2009, 07:20 PM
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Quote:
Originally Posted by NEW INTERIORS
I would go with a 2800-3000 stall...
Same here also. . Cole
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Old 07-21-2009, 08:28 PM
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Mikey, The TH350 uses a kick down cable, from the description it was adjusted too tight. As you most likely know, this adjustment will change the internal transmission pressures. Too tight and the internal 'apply' pressures are going to be higher.

Off the cuff, I am thinking those heads flow from 3000 to 7500 RPM. With the intake, once again I have not seen one, but I think it is a single plane. If it is a dual plane manifold design, it will give more lower RPM torque, thus effecting
the choices of RPM ranges in camshafts, and torque converters.

That light of a car, with a 3.0 gear, might just work with a 2600 to 2800 stall speed converter, if it is more of a single plane intake.
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