Does anyone happen to know the stock stall converter's rating for a 1974 Type LT z28 with TH400?

 

no, but why are you wondering?

it would be paired with your stock engine's power range (which isn't that high). your best bet would be to look up your stock cam's specs and where it's power range starts, is probably right around a stock stall's numbers. I would bet it is probably around a 1500-1800 RPM stall speed, but that's just a guess

a stock converter is not something to build your engine, or chose a high performance cam around

 

Yeah, that's why I was asking what the stock converter was. I was looking at upgrading the cam and was wondering if a stall would be needed or not. A friend of mine said that he's pretty sure that it has a 2300 stall in there already but I was just wondering if there was a way of telling. Do stalls have parts numbers on them anywhere?

 

your best and easiest solutionis to call the cam manufacturer you plan on using, and they will set you straight. you really don't "need" a new stall just because you are putting a new cam in.

I also think you need to change your sig line

you are claiming all matching numbers, but then you go on to say you have a turbo 400?

 

Yep, all matching numbers. Have the transmission and engine removed and verified.

You can check here. 1974 had turbo400's shipped with z28's or as a "towing package" also known as RPO code M40.

Also:

Turbo Hydramatic 400
Used from 1970 to 1974 primarily on high horsepower 350's and big-block engines. Generally, a Super Sport or Z28 equipped with an automatic will be getting a TH400. This transmission can be quickly identified by the shape of the pan - "not square" (looks like the state of Indiana), and it has an electrical kickdown switch. The electrical kickdown (or lack thereof) is helpful in identifying wether some cars were SS's or Z28's. The kickdown connection has a hole punched into the firewall for the wire to pass through. Plus there should be an electrical switch mounted on the brake pedal bracket. Usage Code (on tag rivited to case):
CK is for small block TH400
CY is for big block TH400.