Thread: blower on a 400

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Originally Posted by erik erikson

At or around 800 on a 400 even with all the prep work you have done is an accident waiting to happen.
It is a miracle that it has not blown yet.
We have built a few 400's,412's,420 etc. over the years.
We did the same level of prep work you did and also added deck plugs.
Every one of them ended up cracking right down the lifter valley..

I beleive you. One professional local racer said that he could never get a 400 block to take more than 600 hp. I am wondering, do you remember if you ever used a 817 block? Maybe that is the difference!

Originally Posted by erik erikson

I would guess the only reason they are living is because they are in a street car and you can't hook it up.

Actually mine hooks up. I have AWD with a drag radial at each corner

Originally Posted by TyphoonZR

I beleive you. One professional local racer said that he could never get a 400 block to take more than 600 hp. I am wondering, do you remember if you ever used a 817 block? Maybe that is the difference!


Actually mine hooks up. I have AWD with a drag radial at each corner

What transfer case are you running?

Originally Posted by erik erikson

What transfer case are you running?

I think the number is, Borg Warner 4420, but whatever the number might be, it is a transfer case out of an AWD Chevy Astro or Safari van. These are the same cases that came in the Syclones and Typhoons between 91-93.

That is so funny that you would ask that. Everyone, and I mean everyone,... asks me that very same question. The next question is, "is it stock?" Then, "it has never broken?"

I have no idea why it hasn't. When I launch without nitrous, the left front wheel lifts. If I launch with, it lifts even longer, (I'm only talking a second, if that). Then when it comes down I feel a little tug and away we go. The tug might simply be my suspension groaning because of the weight coming back down, no idea. Everything is tight. I can only imagine what the camber of the wheels are doing in that moment.

Over the years I have replaced the entire transfer case because I felt the viscous coupler was allowing the rear wheels too much spin. I gauge this by the amount of restraint I feel when turning a corner. If it starts rolling to easy around a corner, I know it's time. But I have only done that once over 7 years. One other time I replaced the chain with another stock chain, just because.

Other than that, I have all stock components. CV shafts, u-joints, driveshafts, except for the whimpy rear end that chevy came with. I replaced the 7.5 inch with a *cough* *cough* 8.8 inch.

Originally Posted by TyphoonZR

I think the number is, Borg Warner 4420, but whatever the number might be, it is a transfer case out of an AWD Chevy Astro or Safari van. These are the same cases that came in the Syclones and Typhoons between 91-93.

That is so funny that you would ask that. Everyone, and I mean everyone,... asks me that very same question. The next question is, "is it stock?" Then, "it has never broken?"

I have no idea why it hasn't. When I launch without nitrous, the left front wheel lifts. If I launch with, it lifts even longer, (I'm only talking a second, if that). Then when it comes down I feel a little tug and away we go. The tug might simply be my suspension groaning because of the weight coming back down, no idea. Everything is tight. I can only imagine what the camber of the wheels are doing in that moment.

Over the years I have replaced the entire transfer case because I felt the viscous coupler was allowing the rear wheels too much spin. I gauge this by the amount of restraint I feel when turning a corner. If it starts rolling to easy around a corner, I know it's time. But I have only done that once over 7 years. One other time I replaced the chain with another stock chain, just because.

Other than that, I have all stock components. CV shafts, u-joints, driveshafts, except for the whimpy rear end that chevy came with. I replaced the 7.5 inch with a *cough* *cough* 8.8 inch.

What transmission are you running,what type of torque converter?

Originally Posted by erik erikson

What transmission are you running,what type of torque converter?

I am running a 700R4 with a 3200 stall lock-up converter. I've got the lock-up hooked to a toggle switch on my B&M Hammer shifter lift-up lock-out along with the nitrous button. B&M has a neet shifter knob with the ability for the nos button off of the driver's end of the knob which is activated with your thumb. It is real handy. I could tell you where my bottle is hidden, which is within driver's reach, but then I would have to kill you.
J/K, I've got it hidden under the center consel with the valve being accessible when I lift out the change tray. hehehehehehhehehe! Not even croutch rockets have a chance off a light.