My buddy is about to send his longblock to Nu-Tek for a 383. Fully forged, ported heads, and a CC306. He should be spinning up close to 7,000 RPM. He will be staying NA for now. The car (1995 Vette) has stock gears but he will be upgrading to 3.73's soon.

The only thing he can't decide on is stall. I recommended a Vigilante 3,600. His torque should peak around 4,000-4,200 RPM. I have had a Vig 3,600 in my car and it drove very nice on the street (I have a 4,100 now). He is afraid that is a bit too much stall and is considering a 2,800. I really think that will hurt his ET's at the track.

What do you think? The car is not a daily driver but will see a lot of street miles.

 

3600 sounds about right. Why doesn't he call PI and see what they think. I wouldn't go any lower than 3200.

 

What year LT1 is it?

If its a 94-95 he can't go past a 3000 stall.

If its a 93, 96, 97 he can go as high as he wants.

With the stroker he's going to have a lot of torque anyways.

So with the 95 3000 is the highest he can go on that PCM before he has problems upshifting.

 

That's not true, the high stall issue does not affect all OBDI cars. In fact it's a low percentage that have the problem. I run a 4,100 Vigilante in my 95 Impala, shifts fine. I did have issues 3 years ago but tuning has come a long way since then

 

No more input?

 

Converter stall is a function of both the converter design and construction and the torque curve of the motor. It only makes sense to describe a converter as "xxxx stall" in reference to a particular motor. I suggest calling one of the good torque converter manufacturers and getting exactly what is needed.

As far as what rpm stall he will like, he needs to drive a couple of cars with converters stalling at different speeds and see what he likes. Usually, a converter that gives the best ET's is way to loose for street use. Most people find a converter that stalls in the 3,200-3,500 range tolerable on the street and effective on the track. But after deciding on the desired stall, he really does need to speak directly to a converter manufacturer to get what he wants.

Rich Krause

 

I have to agree that the shifting problem can be eliminated in virtually any car that has a good trans to back it up and good programming. He'll also want to go w/ vacuum modulated line pressure. 3200 sits real nice w/ most people after they get used to it. a 2800 stall is what most people like for slightly to moderately modified cars. A 383 w/ a CC306 is in the slightly more modified car class which is one under the slightly more than slightly more modified car class.......

 

Thanks for the replies, the poll results are kinda mixed... anyone else?