73 cuda 340 727 stall?

[mattmoto441]

I have a original 73 340 cuda with the 727 . And I'm wanting to upgrade the stall just wanting to know what the factory stall is rated at?

Was looking at this B&M 10416 B&M Tork Master Torque Converters | Summit Racing

 

[MerlinsMopars]

You really only need a higher stall if the motor has a larger cam. Otherwise stock should work well.

 

[Chryco Psycho]

Factory for the 340 was 1800 ish , , you need the stall to work with the cam choice so if the cam starts working at 1800 rpm for example you want a 2200 stall but you have to watch the gear ratio so if highway speed is 2400 rpm at 70 MPH you want the stall speed below that around 2200 to make sure the converter is locked up & effecient at that speed otherwise you are generating excess heat with the converter slipping .

 

[bennydodge]

1973 factory service manual says 2200-2500.

 

[mattmoto441]

Factory for the 340 was 1800 ish , , you need the stall to work with the cam choice so if the cam starts working at 1800 rpm for example you want a 2200 stall but you have to watch the gear ratio so if highway speed is 2400 rpm at 70 MPH you want the stall speed below that around 2200 to make sure the converter is locked up & effecient at that speed otherwise you are generating excess heat with the converter slipping .

Its a 3:92 rear . But I think the current converter is taking a dump it stalls at like maybe 1200

 

[bennydodge]

Are you sure the converter is the factory original? The torque converter is a reactive device. The more power the engine makes the higher the converter stall speed will "flash". Likewise when an engine declines in power the converter won't stall very high. Make sure the engine is running at peak power. Higher numerical gearsets will make the stall speed lower as well.

 

[Chryco Psycho]

You can test the converter just hold the brakes hard & punch the throttle & see how high the the rpm will rise to .

 

[i_taz]

Did they lock up back then...?

 

[bennydodge]

No lock up in 1973.

 

[Chryco Psycho]

Yes & no , the stall is the RPM where it "locks up" but they do not have a clutch in the converter to fully lock it like modern converters .