[70' c10]

hey im swapping a 350 from a manual truck to an automatic and not quite sure what stall of torque converter i should use.

its got a p/n 3927140 cam
257/269 duration @ .050
3.73 gears
mild build
thanks

[va4cqd]

2500-2700 rpm

[Crosley]

If those duration specs @.050 are correct. I would not call that a mild camshaft build engine

[70' c10]

Well maybe a little better than mild haha! Thanks for the response at least ive got some numbers to work with now. That cams rpm range starts at 4200 would it hurt to go with a little higher stall?

[cobalt327]

Originally Posted by 70' c10

Well maybe a little better than mild haha! Thanks for the response at least ive got some numbers to work with now. That cams rpm range starts at 4200 would it hurt to go with a little higher stall?

4000-4500 RPM stall and steep rear gears if you're drag racing it. If this is a street driven vehicle, depending on a lot of things like weight, gearing, heads, etc., the stall might could be somewhat lower- giving away some acceleration in the process.

A tranny cooler is a must. So is a lower rear gear- if max acceleration is wanted. If you're determined to keep the 3.73's, they will be holding you back. This engine is going to need compression to work.

[F-BIRD'88]

You would want a minimum of a 4000 stall (9" converter). A 5000-5500 stall 8" race converter is not too much at all. 3.73's is not near enough. Think 5.38 5.57+ for a heavy truck.

This is not a good truck cam. For auto trans you will need to recurve the distributor. First try locked mechanical advance. Then try 26deg at idle, a short 10 deg curve and 36 total max advance.

[70' c10]

You would want a minimum of a 4000 stall (9" converter). A 5000-5500 stall 8" race converter is not too much at all. 3.73's is not near enough. Think 5.38 5.57+ for a heavy truck.

this is a street truck so those tall gears are gonna have it screaming at highway speed. if i went with a 4000 stall could i get away with 3.93 or even 4.11's
thanks