big block verses smallblock stall speed

[leanburn]

i have a friend with a very slightly used 3500 stall that he had behind his 440 then he went to a 4 speed. i'm thinking of trying it in my 340 cuda. my question is if it would stall at 3400 behing his 440, what would it stall in my 340? i know it depends on cam, gears, weight, ect, but is it possible to somehow get a close estimate, i don't want to even try if it going to be something crazy like 4,000.

are all 727 converters the same as far as fittup?

[tactransman]

340 will stall it less if the 440 was tuned right. Converters are the same as far as fit except '67 and earlier coarse 18 spline input shafts. (24 spline '68 and later)

[ntstlgl1970]

I would think the stall speed would be lower since the small block doesn't make as much torque.

[leanburn]

o.k i'm backwards, i thought that since the smallblock had less torque it would require more rpm. thanks guys.

[hemiken]

o.k i'm backwards, i thought that since the smallblock had less torque it would require more rpm. thanks guys.

This has been my experiance, i took a 3000 stall out from behind a 360 and fitted it up behind a 400 biggy and now have aroung 2600 - 2700 stall.............

[422STROKER]

I would think the stall speed would be lower since the small block doesn't make as much torque.

Depends on the Smallblock.....

Tom

[tactransman]

It matter more on engine torque and where the engine is making it in the RPM band then big/small block. Big blocks usually make more torque down low and they over come the "resistance" in the converter and make it stall higher.

[hemiken]

It matter more on engine torque and where the engine is making it in the RPM band then big/small block. Big blocks usually make more torque down low and they over come the "resistance" in the converter and make it stall higher.

That is exactly what i thought until i changed in my convertor.  Exact same profile Purple shaft cam was used in both engines 284 / 484 and the convertor felt like a very loose 3000 stall behind the 360, but when in behind the 400 it  feels like a tight 2600 - 2700 stall Can not explain why for the life of me, i was hopeing for a 3200 - 3400 stall behind the 400 oh well........................

[oldkimmer]

..........may b ur tach is wacko..........kim.......

[Moparal]

..........may b ur tach is wacko..........kim.......

Or maybe that 400 had 7.5 compression if factory