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Description
Signature Series Crankshaft - Chevrolet Small Block 3.750" StrokeAs the premium line of cranks offered by Lunati, Signature Series Crankshafts are the strongest you will find for your engine. The specialized non twist 4340 forged steel construction comes completely profiled and detailed to our racing specs. Many design features such as gun drilled mains, lightened rod journals, micropolished journals and a windage reducing contoured wing counterweight profile make the Signature Series the best choice for serious
As the premium line of cranks offered by Lunati, Signature Series Crankshafts are the strongest you will find for your engine. The specialized non-twist 4340 forged steel construction comes completely profiled and detailed to our racing specs. Many design features such as gun-drilled mains, lightened rod journals, micropolished journals and a windage reducing contoured wing counterweight profile make the Signature Series the best choice for serious racers. All Lunati crankshafts MUST use narrow or chamfered main and rod bearings. Proven to withstand over 1500 horsepower applications.
Features:
All rod journals are drilled with either 7/8" or 3/4" lightening holes to reduce the inertia weight of the crankshaft
All journal radiuses are ground to .125"; roundness of each journal is .0001" or less
Pulsed plasma nitride heat treated for increased strength and durability
Micropolished journals
Specifications:
Stroke: 3.750 in Main Journal O.D.: 2.448 in Rod Journal O.D.: 2.100 in Minimum Rod Length: 6.000 in Notes: 350 Main / 2PC Rear Seal Connecting Rod: Small Block Chevy Rod Journal Width: 1.900 in
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 5
Great chair with one caveat!!
I ordered this chair to replace my previous computer chair that lacked back support and was generally uncomfortable, and I am very glad I did!!
I was looking for this style of chair and was looking over a few different similar options on Amazon. I did look outside of amazon as well, but Amazon had the best prices in my opinion. I was hesitant on each selection due to either pricing or reviews that scared me away. I ended up going with this one since they were offering a deal on the red and black one - as soon as I saw that, I was sold! I believe it was a middle of the pack price for comparison.
Overall, I really like the chair, but it does come with one warning I will share below:
**DELIVERY** 10/10
I ordered this chair and though I think it did say it was PRIME eligible, it showed that the delivery as a future date that was about two weeks out. I am impatient and entitled, much like most of us Primers, haha, but due to the deal, I bit the bullet and ordered and made myself forget about it since it would be a bit. MUCH to my surprise, it showed up a few days later at my doorstep!!! I was really excited!!! A+ on this category!
**PACKAGING** 9/10
After reading some reviews that stated that the packing was rough, I'm not going to lie, I was expecting a mangled box to be at my front door. Also to my surprise, the box was perfectly fine! Maybe this was feedback that the distributor took and made the necessary changes? I don't know, but everything arrived undamaged in terms of the box. I deducted one point because one of the armrests (left side) had a "chunk" that lifted off the top a bit. To try and describe it, the armrests are like a hard foam, and best I can describe, it was as if something nicked the top flat surface of it and peeled back a small chunk, about the size of a pea. I pushed it back down and it sat. I forgot about it until writing this, and now cannot find it.
**ASSEMBLY** 8/10
Assembly took about 45 minutes to an hour or so. It could have gone faster, but the screw hole on the back rest was crooked, so when attaching the back rest to the seat with the supplied bracket, I kept having trouble and eventually had to remove the back rest completely to try and see what was going on. The screw hole was slightly tilted which was making it hard to thread. Once I saw what was going on, I was about to put the screw in with that in mind and just came in at a slight angle. Everything else was pretty straight forward!
**LOOKS** 9/10
This chair looks really cool. That said, I am in to cars and making them fast/cool, so I do have a bias. The only thing I don't care for as much are the wheels - as much as I love making cars look cool, I thought it was a little corny for computer chair wheels, lol. I don't notice it as much now that it has been assembled, though.
**FUNCTION** 10/10 with one warning
As I said, my old chair sucked, so this is in comparison with that chair. When it comes to function, this hit all the boxes for me. The material is soft and comfortable. The seat cushion is good for me, but I am 145lbs, so not sure how it would fair for a large individual. The chair is pretty wide so I think it would fit a larger person just fine, plus the arm rests can swivel and lock into three different positions - straight, pointed outwards, pointed inwards. Having them pointed outwards allows me to rest my elbows on the backs of them while gaming or working. The back support piece is SUPER helpful for me. It can be re-positioned easily and stays in place. The headrest is nice for neck support, but doesn't stay in place as well and can sag down, but not a big deal.
The warning I was talking about is actually a perk of functioning, but not for me in one instance. Yes, the chair reclines all the way back. Even better, it doesn't tip while doing it, which I thought it surely would laid all the way back. The problem for me is that I was on a work zoom meeting that didn't require the camera on, I reclined all the way back and was "listening." I woke up later :-/
Good chair, I would recommend it!
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Reviewed in the United States on August 3, 2020
★★★★★ 5
Outstanding Chair
Color: Matte-black
This is an outstanding chair.
It’s very well built and has handled up to 300 lbs. with no issues after a couple of weeks of use. The engineering is excellent, the assembly was straightforward, and everything fit together exactly as it should. No stripped bolts, no misaligned holes—something anyone who has assembled other furniture will appreciate.
Overall, it’s sturdy, well-designed, and extremely comfortable. The adjustable armrests are a standout feature and make a big difference in day-to-day use.
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Reviewed in the United States on March 21, 2026
★★★★★ 4
Comfortable, goes together well, a couple of worries about longevity
Color: Matte-black
This is a chair with a lot to like, and a couple of concerns. Let's do the pros-and-cons thing.
Pros:
* Excellent assembly manual and parts organization. The manual is well-written; if it's translated from another language, it had a pass by a fluent English speaker. Folks, any time you localize, have a native speaker of whatever language you're going into give it a once-over. Also, the manual had a few ergonomic hints that will help with comfort. A nice touch.
* Comfortable. I'm not a huge guy (6'1" 240 lbs, yes I need to lose a little) but I do sometimes have fit trouble in a standard chair (mostly due to long legs rather than a wide... seating surface). This is a good chair for a tall person, but as the arms are outward adjustable at the time you build it (and with a little bolt turning after), this will also allow for folks who are plus-sized. You can also leave them off completely if you want (which isn't true of all office chair designs).
* Assembles well. Good fit and finish. All the bolt holes lined up, it was well packaged and arrived undamaged.
* The parts card includes one extra of every bolt type. This is very much appreciated, even though I didn't need the spares. Every flat-pack manufacturer should do this.
Cons:
* The seat cushion is very firm. I wouldn't describe it as "hard", and I understand why (the foam won't compress all the way to the seat pan for folks at the maximum weight range this chair is designed for). We'll see what it's like after a long day. Also, very stiff foam like this does tend to break down over time. Ask me again in a year.
* The support tubes for the leg rest seem flimsy, and the brackets through which the leg rest support tubes extend are plastic. I'm skeptical how much weight they can support, but I don't plan on using the leg rest anyway.
* The cushion that comes with it can be used for either neck or lumbar support, which is nice, but it's held on by an elastic band that attaches with a mechanism similar to some bras. It'll come off when you don't want it to (i.e. adjusting it) but is a pain to re-attach when you do want it to. Insert standard stand-up comedy joke here. A pinch-buckle would have been better.
* Cheap casters. But I ordered better ones, and it should be fine.
Note that the manual and box have different branding. That's not uncommon, as many things like this are sold under different brands even though the product is identical across the brands. Must be an Amazon/bookkeeping thing.
Overall, this seems to be a good chair. I like its appearance, it's comfortable so far, and assembling it wasn't a terrible ordeal. The price is also good for what you get. With the caveat of "let's see what longevity is like" and "better casters would be appreciated" I do recommend it.
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Reviewed in the United States on September 5, 2025
★★★★★ 5
Great chair - great customer service from seller
Color: Matte-black
Good chair for home office. Easy to assemble and comfortable to use. I was concerned when it arrived as the bottom of the box had gotten wet and damaged during shipment. But the only issue was the frame for the footrest had rusted in a couple places. I contacted the company, sent pictures and in a couple of days they shipped back the complete footrest already assembled. Great customer service and so far a great chair.
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Reviewed in the United States on April 22, 2026
★★★★★ 5
Very Impressed
First off, I just want to say that this is a very good company. They have the best customer service that I have seen with any online company that I have ever dealt with. Other companies should take notes on how they should handle problems from this company. Now On to my review of this chair. I purchased the chair almost 5 months ago now and was pretty hyped about getting it. It is not very easy to find a chair for a larger person. I weigh 299 pounds and needed something that would support that. Some of the other office chairs I have had in the past said that they did support up to and over my weight and the gas cylinder would always give out. So far, I have not had any issues with it. Now I did have a few problems with the chair, and the company fixed the problem right away. The first was comfort. When I first got the chair, it was kind of stiff which is expected of a new chair. But the wings on the side of it would rub on my legs making it painful to sit in the chair for more than an hour. It seemed that the metal bars in it were too far pressed in. I contacted the company about it to see what they could do to fix the problem and they sent me out a cushion to help raise me above the cushion. That was good enough for me. Eventually I ended up not having to use the cushion. (I was working on losing weight.) They second problem happened with the wheel base. One of the supports that held the wheels in place had come apart. I contacted the company right away and sent them a picture of the problem and they sent me out a new base. Not the easiest to change out once you have set it in place. But after watching videos on YouTube I was able to get it replaced. Now 4 months later I did have another issue with the chair which actually happened to me 1 week ago now from this date. My arm rests were moving around a lot and I didn't understand why. So, I flipped the chair over to check and see if the screws had come loose. They were not loose at all. I then went ahead and took the arm rests off and as soon as I did I noticed a metal bar had fallen. I removed the felt that was hiding it and seen that the welds that held the bar in place had failed. I am not going to lie I was pretty bummed about it. I contacted the company and explained to them what happened, I sent in pictures to show the problem. They got back to me within hours of my complaint and sent me out another seat to replace the old one. I just got it 2 days ago and put it on and all is good again. Now one thing I noticed about the new chair seat is that the metal bars are not sticking in my side. Either I have lost weight (I have.) or they have fixed that problem. Either way I am completely happy. Now I am sure that there are other chairs out there that are a bit better in comfort but they also cost a lot more. This is a very nice chair for anyone looking to get a gaming office chair and not break the bank in the process. Just a few pros and cons about the chair.
Pros:
1. Great Customer Service from the company. They actually uphold a warranty.
2. Affordable price for a gaming office chair.
3. The recline feature comes in handy and is really nice.
Cons:
1. The arm rests should be a bit higher or be able to extend higher then what is allowed currently.
2. Not the most comfortable chair if you sit in it for extended times. More cushion could help this problem.
Overall, I am really happy with my purchase and would recommend and use this company again in the future. I hope that someone finds this review helpful when going to purchase a affordable office chair.
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Reviewed in the United States on August 7, 2018