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Pampered-Z · 06-13-2007, 10:02 AM

Well this is a judgment call. 2800-3200 is a good fit for the street with that cam and 3:73s. I did two motors with GM847 cams. Both autos, one has a 3200 stall and 3:73, other has 3:42 and we will be installing a 3600 stall in a few weeks. (Both are Yank converters, the 3200 is street and the 3600 is race). Will be interesting to compare the two cars? Should have both at the F-body nats in August.

One thing though is that as you go higher on the stall it can make the car start to feel sluggish when your down low in the RPM before you get into the cam's power range and the converter is locked. Some love the bigger converter, other hate it.

Probably the most used brands that I'm familiar with are Yank or Vigilante. There seems to be mixed reviews about the Fudd converters when used on 4th gens. With either you want to make sure you specify it's for Street and N/A.

Also, installing a quality trans cooler should be on your list as well.

Curious why the 503? = emissions?

06-13-2007, 10:02 AM	#7
Pampered-Z Sliderule / Moderator Join Date: Oct 2004 Location: Catawissa PA Posts: 2,294 iTrader: (1)	Well this is a judgment call. 2800-3200 is a good fit for the street with that cam and 3:73s. I did two motors with GM847 cams. Both autos, one has a 3200 stall and 3:73, other has 3:42 and we will be installing a 3600 stall in a few weeks. (Both are Yank converters, the 3200 is street and the 3600 is race). Will be interesting to compare the two cars? Should have both at the F-body nats in August. One thing though is that as you go higher on the stall it can make the car start to feel sluggish when your down low in the RPM before you get into the cam's power range and the converter is locked. Some love the bigger converter, other hate it. Probably the most used brands that I'm familiar with are Yank or Vigilante. There seems to be mixed reviews about the Fudd converters when used on 4th gens. With either you want to make sure you specify it's for Street and N/A. Also, installing a quality trans cooler should be on your list as well. Curious why the 503? = emissions? __________________ 93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada 1) Build it 2) Race it 3) Break it 4) Repeat!!!