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Description
B&M Nitrous Holeshot 3500 Torque Converter, 1965-91 GM TH400, TH425 - 20484Overview: B&M Nitrous HoleShot 3500 stall for GM 1965 91 TH400, TH425, TH375 and 1968 81 TH350, TH375B (not TH350C.) The Nitrous Holeshot 3500 stall converter are an excellent choice for vehicles with many engine modifications, particularly big cams that tend to reduce low end power and torque. The higher stall speed of this converter will launch the car in a higher rpm range where more torque is readily available, resulting in quicker acceleration.
Overview:
B&M Nitrous HoleShot 3500 stall for GM 1965-91 TH400, TH425, TH375 and 1968-81 TH350, TH375B (not TH350C.) The Nitrous Holeshot 3500 stall converter are an excellent choice for vehicles with many engine modifications, particularly big cams that tend to reduce low end power and torque. The higher stall speed of this converter will launch the car in a higher rpm range where more torque is readily available, resulting in quicker acceleration. Nitrous Holeshot converters feature furnace brazed impeller and turbine, new precision steel alloy pump drive tube, new heavy duty needle bearings between the stator and impeller (not a thrust washer) and needle bearings between the stator and turbine. Other features include dual pattern 10.75 and 11.50-inch bolt circle, a new turbine hub, new springs and rollers in the stator and anti-balloon plates. The anti-balloon plates will allow these converters to stand up to the instant horsepower that a nitrous plate system delivers. Stall speed listings are based on engines producing 230lb. ft. of torque at 2,500 rpm. More torque at 2,500 rpm will give you more stall speed, less torque at 2,500 rpm will give you less stall speed than the stall speed ratings indicated. These are serious converters for serious performance street cars. To prevent contamination left from worn parts being circulated in your new components causing premature wear, we strongly recommend protecting your investment by adding a B&M transmission cooler with all new transmission installations. Listed converters are NOT to be used in trans-brake applications. Not for use in trans-brake applications.
Features:
- Needle Bearing Between Stator and Turbine
- Higher Stall Speed, Quicker Acceleration
- Anti-balloon Plate for Added Strength
- Furnace Brazed Impeller and Turbine
- Fully Balanced and Pressure Tested
- Steel Alloy Pump Drive Tube
- B&M Quality & Durability
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| 1975 | Pontiac | Grand Prix | ||
| 1977 - 1978 | Pontiac | Grand Safari | ||
| 1976 - 1977 | Pontiac | Sunbird | 140/2.3 L4 | |
| 1976 - 1977 | Oldsmobile | Starfire | 140/2.3 L4 | |
| 1975 - 1977 | Chevrolet | Monza | 140/2.3 L4 | |
| 1977 - 1978 | Pontiac | Phoenix | 151/2.5 L4 | |
| 1977 - 1980 | Pontiac | Sunbird | 151/2.5 L4 | |
| 1978 - 1980 | Oldsmobile | Starfire | 151/2.5 L4 | |
| 1977 | Pontiac | Ventura | 151/2.5 L4 | |
| 1978 - 1980 | Chevrolet | Monza | 151/2.5 L4 | |
| 1969 - 1970 | Chevrolet | Nova | 153/2.5 L4 | |
| 1965 | Chevrolet | P10 Series | 153/2.5 L4 | |
| 1966 - 1967 | Chevrolet | Chevy II | Base | 153/2.5 L4 |
| 1965 - 1967 | Chevrolet | P30 Series | 159/2.6 L3 | |
| 1969 - 1970 | Chevrolet | P30 Van | 159/2.6 L3 | |
| 1966 - 1967 | Chevrolet | P20 Series | 159/2.6 L3 | |
| 1966 | Chevrolet | P10 Series | 194/3.2 L6 | |
| 1965 | Chevrolet | Chevelle | Base | 194/3.2 L6 |
| 1965 | Chevrolet | Chevelle | Deluxe | 194/3.2 L6 |
| 1966 | Chevrolet | Chevelle | 194/3.2 L6 | |
| 1966 - 1967 | Chevrolet | Chevy II | Base | 194/3.2 L6 |
| 1965 - 1966 | Chevrolet | El Camino | 194/3.2 L6 | |
| 1978 - 1979 | Buick | Regal | 196/3.2 V6 | |
| 1978 - 1979 | Buick | Century | 196/3.2 V6 | |
| 1978 - 1979 | Chevrolet | Monza | 196/3.2 V6 | |
| 1978 - 1979 | Pontiac | LeMans | 200/3.3 V6 | |
| 1978 - 1979 | Chevrolet | El Camino | 200/3.3 V6 | |
| 1978 - 1979 | GMC | Caballero | 200/3.3 V6 | |
| 1978 - 1979 | Chevrolet | Malibu | 200/3.3 V6 | |
| 1978 - 1979 | Chevrolet | Monte Carlo | 200/3.3 V6 | |
| 1965 | Pontiac | LeMans | 215/3.5 L6 | |
| 1965 | Pontiac | Tempest | 215/3.5 L6 | |
| 1965 | Oldsmobile | F85 | 225/3.7 V6 | |
| 1965 - 1967 | Buick | Special | 225/3.7 V6 | |
| 1965 - 1967 | Buick | Skylark | 225/3.7 V6 | |
| 1980 | Pontiac | Catalina | 229/3.8 V6 | |
| 1980 | Pontiac | LeMans | 229/3.8 V6 | |
| 1980 | Pontiac | Grand LeMans | Base | 229/3.8 V6 |
| 1980 - 1981 | Chevrolet | Camaro | 229/3.8 V6 | |
| 1980 | Chevrolet | Caprice | 229/3.8 V6 | |
| 1980 | Chevrolet | El Camino | 229/3.8 V6 | |
| 1980 | Chevrolet | Impala | 229/3.8 V6 | |
| 1980 | Pontiac | Grand LeMans | Safari | 229/3.8 V6 |
| 1980 | GMC | Caballero | 229/3.8 V6 | |
| 1980 | Chevrolet | Malibu | 229/3.8 V6 | |
| 1980 | Chevrolet | Monte Carlo | 229/3.8 V6 | |
| 1969 | Chevrolet | G20 Van | 230/3.8 L6 | |
| 1965 | Chevrolet | P30 Series | 230/3.8 L6 | |
| 1969 - 1970 | Chevrolet | Nova | 230/3.8 L6 | |
| 1965 | Pontiac | Tempest | 230/3.8 L6 | |
| 1966 - 1967 | Pontiac | Tempest | Custom | 230/3.8 L6 |
| 1969 | GMC | G15/G1500 Van | 230/3.8 L6 | |
| 1967 | Pontiac | Firebird | Base | 230/3.8 L6 |
| 1967 | Pontiac | Firebird | Sprint | 230/3.8 L6 |
| 1965 | Chevrolet | Impala | 230/3.8 L6 | |
| 1965 - 1967 | Chevrolet | P10 Series | 230/3.8 L6 | |
| 1969 | Chevrolet | P10 Van | 230/3.8 L6 | |
| 1965 | Chevrolet | P20 Series | 230/3.8 L6 | |
| 1965 - 1969 | Chevrolet | El Camino | 230/3.8 L6 | |
| 1965 | Chevrolet | Chevelle | Base | 230/3.8 L6 |
| 1965 | Chevrolet | Chevelle | Deluxe | 230/3.8 L6 |
| 1966 - 1967 | Chevrolet | Chevelle | 230/3.8 L6 | |
| 1969 | Chevrolet | Camaro | RS | 230/3.8 L6 |
| 1969 | GMC | P15/P1500 Van | 230/3.8 L6 | |
| 1969 | Chevrolet | G10 Van | 230/3.8 L6 | |
| 1965 | Chevrolet | Bel Air |
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4.5 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 5
Works great, keeps the light out of my eyes and easy to put together
Size: 1 Panel, Size: 1 Panel
I got this room divider in and it works great. It’s really easy to put together you don’t even need tools. I really like that it’s not see through, it’s not a black out curtain but it keeps light out pretty good.
I absolutely hate my bedroom layout there’s no bathroom door. My girlfriend and I have different work schedules so I’m trying to sleep while she’s getting ready for work and the light shines right in my eyes. This divider keeps the light out of my eyes and that’s exactly what I was hunting for. I also like that you can adjust the length. I took one of the bars out to make it a little shorter and it worked great.
I would recommend this room divider.
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Reviewed in the United States on February 26, 2026
★★★★★ 5
Versatile Room Divider With Easy Assembly and Strong Coverage
Size: 3 Panel 12FT W
I picked up this Siebwin 3-panel folding room divider mainly for privacy and room separation, and overall it works very well.
Assembly is very straightforward, and the divider can be set up, taken apart, and stored without much effort. The fabric quality feels good, and the frame construction is stronger and more stable than expected. The support tubes especially feel well built and help keep the divider standing securely.
One feature I really liked is the flexibility of the design. The panels can be used together as a complete divider or separated depending on the setup and available space. That makes it much more versatile for different room layouts or temporary privacy needs.
The coverage is also very good, and the size matches the manufacturer’s description accurately. The fabric blocks light and background visibility well enough to provide solid privacy without feeling overly heavy. The wider feet also help improve stability compared to thinner folding dividers.
Another positive detail is that everything arrived complete with no missing parts or damaged pieces, which made assembly much easier and faster.
Compared to cheaper privacy screens, this one feels more durable and easier to customize depending on the situation. In terms of value for the money, it feels like a very practical and worthwhile purchase considering the size, flexibility, and build quality.
Overall, a versatile and well-built room divider with easy assembly, strong privacy coverage, stable construction, complete included parts, flexible panel configuration, and excellent everyday functionality.
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Reviewed in the United States on May 27, 2026
★★★★★ 5
Stable, flexible in deployment configuration, creates true privacy and looks great.
Size: 3 Panel 12FT W
This is the second room divider panel I have installed, and there are several features about this one that I like much better than my older one.
The fact that there are no gaps and that the material is thicker means you get more privacy or more hiding power, if you wish. My older divider has vertical spaces between each of the panels and the panels are half as wide as the Siebwin panels, so there are many vertical spaces. The Siebwin divider really creates privacy.
Another feature that I really appreciate is that the legs are wider and stand off from the floor. On my older one the legs are flat and they're rather awkward to adjust because they create more drag on the floor. The feet on the older one also loosen if you turn them counter clockwise, so adjustments of configuration that require the feet to be moved are more complex.
The older divider also must be deployed in a zig-zag fashion because he feet are not as wide, but this new one can be deployed and stable in a straight, an "N" shape or an arc. They are both the same length, but because the older one must be use in a zig-zag deployment it doesn't reach to the length of the new one.
The Siebwin divider definitely costs more at $103.48, but it sports several features and advantages over the other brand, so it does a better job and is worth the extra cost.
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Reviewed in the United States on May 25, 2026
★★★★★ 4
Easy to assemble, does the job, material is shiny nylon and shows creases, minor defects, sloppy
Size: 3 Panel 12FT W, Size: 3 Panel 12FT W
The Siebwin room divider is a good idea, and for the price, it mostly delivers on the intended functionality. I ordered the 12 foot, 3-panel version mainly to hide an unfinished basement storage area that had become an eyesore. It works well for that purpose and gives the space a cleaner appearance without spending the kind of money that more decorative dividers or custom partitions cost. If you need something temporary, portable, or mainly functional, this is a viable option.
There are a few limitations that became obvious during setup and use. The first thing I noticed was that the weld quality on some of the metal poles is fairly sloppy. Once the cover is installed, you do not really see it, but up close, it does not look especially refined or professional. The blackout material also is not a matte canvas style fabric as I expected. It has more of a shiny nylon appearance, and the creases are fairly visible. Being that it’s more of a nylon, I’d be hesitant to try steaming it to remove the creases. However, the creases do not matter if you are using it in a basement, dorm, or shared room, but for photography, video work, or a professional office setting, the appearance could be disappointing. The fabric is thick enough, though. It blocks visibility well enough, but strong light behind it still shows through to some extent, nothing deal-breaking. Also, my fabric appeared to be slightly defective. The hook and loop strip on one of the bottom sections was off-center and couldn't be totally attached because it was lined up with one of the legs. I originally hoped to use this as a video backdrop, but I will probably end up replacing the fabric with a proper green screen or canvas material while continuing to use the frame itself. For now, it does a good job of covering my basement junk.
Assembly was actually easier than I expected and took roughly 15 to 20 minutes. The longer vertical poles are tethered together similarly to tent poles, which made setup straightforward and fairly intuitive. The shorter horizontal pieces slide and snap together to the top and bottom of the vertical assembly. After each section is assembled, the divider panels connect together with metal plates and two knurled screws (at the top and bottom), so no tools are really required. A few screws were difficult to start because paint had gotten into the threads, but once they caught, they tightened down normally. The feet install with similar knurled fasteners and help keep the divider reasonably stable. One thing to watch for during setup is the fabric orientation. There is one arrow indicator in the middle of the fabric to indicate up. However, if you need another indicator, the smaller hook and loop strip goes on the bottom while the longer strip goes on top. I realized mine was upside down right before finishing and had to redo it. I wasn't difficult to redo, despite the defect in mine.
The overall design is practical and easy to move around. I do like that the panels can fold and bend into different shapes depending on the space. The widened feet help stability, although when trying to stretch the fabric tight, I noticed the poles sometimes wanted to overlap slightly at the joints. Tightening everything helped somewhat, but it still happened occasionally. The divider feels adequate for normal indoor use, though I would not expect premium durability or luxury-level fit and finish at this price point. The entire device can also be easily disabled and stored in a tote if you need it completely out of the way. It comes with assembly instructions, but even if you didn’t have them, it’s easy to build without them (save a mistake or two).
In terms of value, I think the Siebwin divider mostly matches its price. Around $100 gets you a large freestanding partition with decent usability and easy assembly, but there are compromises in materials, appearance, and refinement. The defects are also off-putting, but hopefully you won't have them. Higher-end room dividers can easily cost two or three times more, so some of the tradeoffs are expected. I also noticed cheaper alternatives online, but based on the quality here, I suspect those would probably have even more issues. For practical home use, temporary privacy, hiding storage areas, or separating shared spaces, this is a good option as long as expectations stay realistic.
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Reviewed in the United States on May 18, 2026
★★★★★ 3
Works well but takes up more space than expected
Size: 2 Panel 8FT W, Size: 2 Panel 8FT W
This room divider does the job for creating a little extra privacy and was easy enough to set up. The panels feel decent quality and the wider feet help keep it more stable than some cheaper screens I’ve tried. My only issue is that it takes up a bit more room than I expected, especially with the feet sticking out. It’s still portable and folds away nicely, but definitely measure your space first. Overall it works well for separating a room or blocking off an area temporarily. i wish it came in other colors
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Reviewed in the United States on May 26, 2026
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