Thread: Wich stall conv. is best for big blocks?

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I want to put on a stall converter on my '72 454 a 1000rpm above stock , all the converters I've found say dont use on big blocks , does any one know wich one is best?

All converters have a stall speed expressed in RPM. If they didn't, your car would die when it stops.

Now, my first question is why? Is the engine stock? If it is, using a higher stall speed will simply cause more slippage and more heat in your transmission. If you've modified your engine, then you may have a case for a higher stall speed.

Higher stall speeds in converters are to allow the transmission to slip until the engine revs up into its power band. If you engine is stock, you're already there. Also, stall speed isn't just dependent on the converter. A converter will have different stall speeds on different engines, depending on the torque output.

I'm confused with your statement that all the converters you've found say "don't use on big blocks." Everyone who makes an aftermarket converter makes one for big blocks. For example.

http://www.tciauto.com/converters/index.htm

http://www.bmracing.com/index.php?id...ubcat=6&pid=49

Ya, I allready know what a stall converter is and how it works, my car does have mods on it,& it even has custom made parts, but the stall converter is stock. I thought that some one that is running a B.B. setup could recomend a converter they like, or use.
I also understand the limitation of my egines combination, and the stall speed it can handle.

Thanks

Originally posted by Henry Rifle
All converters have a stall speed expressed in RPM. If they didn't, your car would die when it stops.

Now, my first question is why? Is the engine stock? If it is, using a higher stall speed will simply cause more slippage and more heat in your transmission. If you've modified your engine, then you may have a case for a higher stall speed.

Higher stall speeds in converters are to allow the transmission to slip until the engine revs up into its power band. If you engine is stock, you're already there. Also, stall speed isn't just dependent on the converter. A converter will have different stall speeds on different engines, depending on the torque output.

I'm confused with your statement that all the converters you've found say "don't use on big blocks." Everyone who makes an aftermarket converter makes one for big blocks. For example.

http://www.tciauto.com/converters/index.htm

http://www.bmracing.com/index.php?id...ubcat=6&pid=49

Well, that's cool that you know all that, but your not giving us much to go on, like" What cam, Compression ratio, Rear end Ratio, torque peak, HP peak, etc, etc, etc. We'd love to help but we need much more info.

Originally posted by ChevyPower
I want to put on a stall converter on my '72 454 a 1000rpm above stock , all the converters I've found say dont use on big blocks , does any one know wich one is best?

I'm guessing this is going in your caprice, depending on your rear end gear ( my 70 BB caprice was 2.73 ) I'd use a B&M holeshot 2400 or 3000, the latter ONLY if you have a 3.54 or lower gear ( don't need to be slipping at cruise RPM ).

And your right about NOT using a B&M torque master or a Summit converter (same thing) for BB's, also if nitrous is going to be used get a "anti balloning" converter.

Stock converters are for towing

Get all your engine specs written down, cam card, compression, ignition system, carb, and the rear end ratio and call one of the companies who make them. Lots of variables on what the converter will actually flash at. The guy who does the trannies for cars I have built just calls the company he gets the converter from any orders one special built to work on a particular engine.

Ditto to what everyone else said. Get all your information together and give these guys a call

http://www.ptcrace.com/

Good Luck