SKU: 55652860647

COMP Cams Camshaft CS XM 278H-12

$254.70 $283.00
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Description

COMP Cams Camshaft CS XM 278H-12Fits Chevrolet GEN 1 Small Blocks including the 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400. Does not fit LT1 LT4, or factory roller Small Blocks built from 1985 and newer. GM gradually added roller camshafts to 305's and 350's from the mid 80's forward. Camaros Firebirds Corvettes received the roller cams early, but many trucks and SUV's had flat tappet cams until the mid 90's. Remove the intake or timing cover to confirm whether the block is

Fits Chevrolet GEN 1 Small Blocks including the 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400. Does not fit LT1/LT4, or factory roller Small Blocks built from 1985 and newer. GM gradually added roller camshafts to 305's and 350's from the mid 80's forward. Camaros/Firebirds/Corvettes received the roller cams early, but many trucks and SUV's had flat tappet cams until the mid 90's. Remove the intake or timing cover to confirm whether the block is a factory roller or flat tappet. Does not fit the LS1, LS2, LS3 or any LS-based 4.8, 5.3, 5.7, 6.0 and 6.2. 1955-1957 Chevrolet 265 engines require a groove on the 5th cam journal for oiling. Contact us for more information.

Catalog
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This Part Fits:

Year Make Model Submodel
1995-1996 AM General Hummer Base
1980-1985,1987-1991 Avanti II Base
1985 Avanti II GT
1980 Buick Century Base
1980 Buick Century Estate
1980 Buick Century Limited
1991-1996 Buick Commercial Chassis Base
1980 Buick Regal Base
1980 Buick Regal Limited
1992-1995 Buick Roadmaster Base
1996 Buick Roadmaster Collector's Edition
1991-1995 Buick Roadmaster Estate Wagon
1996 Buick Roadmaster Estate Wagon Collector's Edition
1992-1995 Buick Roadmaster Limited
1996 Buick Roadmaster Limited Collector's Edition
1990-1992 Cadillac Brougham Base
1990-1992 Cadillac Brougham d'Elegance
1994-1996 Cadillac Commercial Chassis Base
1992-1996 Cadillac Commercial Chassis Brougham
1993-1996 Cadillac Fleetwood Base
1993-1996 Cadillac Fleetwood Brougham
1980-1982 Checker Marathon Base
1980-1982 Checker Marathon Deluxe
1994 Chevrolet Blazer Base
1992-1993 Chevrolet Blazer Cheyenne
1987 Chevrolet Blazer Custom Deluxe
1988-1991 Chevrolet Blazer Scottsdale
1987-1994 Chevrolet Blazer Silverado
1994 Chevrolet Blazer Silverado Sport
1980 Chevrolet C10 Big Ten
1980-1981 Chevrolet C10 Cheyenne
1981-1986 Chevrolet C10 Custom
1980 Chevrolet C10 Custom Deluxe
1981 Chevrolet C10 Deluxe
1980-1986 Chevrolet C10 Scottsdale
1980-1986 Chevrolet C10 Silverado
1981-1986 Chevrolet C10 Suburban Custom
1980 Chevrolet C10 Suburban Custom Deluxe
1981 Chevrolet C10 Suburban Deluxe
1980,1982,1984-1986 Chevrolet C10 Suburban Scottsdale
1980,1982-1986 Chevrolet C10 Suburban Silverado
1994-1995 Chevrolet C1500 Base
1988-1995 Chevrolet C1500 Cheyenne
1988-1992 Chevrolet C1500 Scottsdale
1988-1995 Chevrolet C1500 Silverado
1990-1995 Chevrolet C1500 WT
1992-1995 Chevrolet C1500 Suburban Base
1995 Chevrolet C1500 Suburban LS
1995 Chevrolet C1500 Suburban LT
1992-1994 Chevrolet C1500 Suburban Silverado
1980-1981 Chevrolet C20 Cheyenne
1981-1986 Chevrolet C20 Custom
1980 Chevrolet C20 Custom Deluxe
1981 Chevrolet C20 Deluxe
1980-1986 Chevrolet C20 Scottsdale
1980-1986 Chevrolet C20 Silverado
1981-1986 Chevrolet C20 Suburban Custom
1980 Chevrolet C20 Suburban Custom Deluxe
1981 Chevrolet C20 Suburban Deluxe
1980,1982,1984-1986 Chevrolet C20 Suburban Scottsdale
1980,1982-1986 Chevrolet C20 Suburban Silverado
1994-1995 Chevrolet C2500 Base
1988-1995 Chevrolet C2500 Cheyenne
1988-1992 Chevrolet C2500 Scottsdale
1988-1995 Chevrolet C2500 Silverado
1994-1995 Chevrolet C2500 WT
1992-1995 Chevrolet C2500 Suburban Base
1995 Chevrolet C2500 Suburban LS
1995 Chevrolet C2500 Suburban LT
1992-1994 Chevrolet C2500 Suburban Silverado
1980-1981 Chevrolet C30 Cheyenne
1981-1986 Chevrolet C30 Custom
1980 Chevrolet C30 Custom Deluxe
1981 Chevrolet C30 Deluxe
1980-1986 Chevrolet C30 Scottsdale
1980-1986 Chevrolet C30 Silverado
1994-1995 Chevrolet C3500 Base
1988-1995 Chevrolet C3500 Cheyenne
1988-1992 Chevrolet C3500 Scottsdale
1988-1995 Chevrolet C3500 Silverado
1980 Chevrolet Camaro Base
1980-1986 Chevrolet Camaro Berlinetta
1985-1986 Chevrolet Camaro Iroc-Z
1980 Chevrolet Camaro Rally Sport
1981-1986 Chevrolet Camaro Sport
1980-1986 Chevrolet Camaro Z28
1982 Chevrolet Camaro Z28 Indianapolis 500 Pace Car
1986-1992 Chevrolet Caprice Base
1980-1996 Chevrolet Caprice Classic
1986-1990 Chevrolet Caprice Classic Brougham
1981-1982 Chevrolet Caprice Classic Estate
1980-1981 Chevrolet Caprice Classic Landau
1993-1994 Chevrolet Caprice Classic LS
1987-1990 Chevrolet Caprice Classic LS Brougham
1991-1993 Chevrolet Caprice Classic LTZ
1980 Chevrolet Caprice Classic Sport
1991-1994 Chevrolet Commercial Chassis Base
1980-1982,1984-1986 Chevrolet Corvette Base
1982 Chevrolet Corvette Collector's Edition
1986 Chevrolet Corvette Indianapolis 500 Pace Car
1980-1987 Chevrolet El Camino Base
1981-1986 Chevrolet El Camino Conquista
1980-1981 Chevrolet El Camino Royal Knight
1980-1987 Chevrolet El Camino SS
1996 Chevrolet Express 2500 LS
1983 Chevrolet G10 Base
1980-1995 Chevrolet G10 Beauville
1981-1984,1986-1987 Chevrolet G10 Bonaventure
1980-1995 Chevrolet G10 Chevy Van
1980-1995 Chevrolet G10 Sportvan
1980-1995 Chevrolet G20 Beauville
1983-1984 Chevrolet G20 Bonaventure
1980-1995 Chevrolet G20 Chevy Van
1980-1981 Chevrolet G20 Nomad
1980-1995 Chevrolet G20 Sportvan
1980-1996 Chevrolet G30 Beauville
1983-1984 Chevrolet G30 Bonaventure
1980-1996 Chevrolet G30 Chevy Van
1980-1996 Chevrolet G30 Hi-Cube
1980-1996 Chevrolet G30 Sportvan
1980-1985 Chevrolet Impala Base
1981-1982 Chevrolet Impala Estate
1980 Chevrolet Impala Sport
1994-1996 Chevrolet Impala SS
1980-1981 Chevrolet K10 Cheyenne
1981-1986 Chevrolet K10 Custom
1980 Chevrolet K10 Custom Deluxe
1981 Chevrolet K10 Deluxe
1980-1986 Chevrolet K10 Scottsdale
1980-1986 Chevrolet K10 Silverado
1981-1986 Chevrolet K10 Suburban Custom
1980 Chevrolet K10 Suburban Custom Deluxe
1981 Chevrolet K10 Suburban Deluxe
1980,1982,1984-1986 Chevrolet K10 Suburban Scottsdale
1980,1982-1983,1985-1986 Chevrolet K10 Suburban Silverado
1994-1995 Chevrolet K1500 Base
1988-1995 Chevrolet K1500 Cheyenne
1988-1992 Chevrolet K1500 Scottsdale
1988-1995 Chevrolet K1500 Silverado
1991 Chevrolet K1500 Sport
1990-1995 Chevrolet K1500 WT
1992-1995 Chevrolet K1500 Suburban Base
1995 Chevrolet K1500 Suburban LS
1995 Chevrolet K1500 Suburban LT
1992-1994 Chevrolet K1500 Suburban Silverado
1980-1981 Chevrolet K20 Cheyenne
1981-1986 Chevrolet K20 Custom
1980 Chevrolet K20 Custom Deluxe
1981 Chevrolet K20 Deluxe
1980-1986 Chevrolet K20 Scottsdale
1980-1983,1985-1986 Chevrolet K20 Silverado
1981-1986 Chevrolet K20 Suburban Custom
1980 Chevrolet K20 Suburban Custom Deluxe
1981 Chevrolet K20 Suburban Deluxe
1980,1982,1984-1986 Chevrolet K20 Suburban Scottsdale
1980,1982-1983,1985-1986 Chevrolet K20 Suburban Silverado
1994-1995 Chevrolet K2500 Base
1988-1995 Chevrolet K2500 Cheyenne
1988-1992 Chevrolet K2500 Scottsdale
1988-1995 Chevrolet K2500 Silverado
1994-1995 Chevrolet K2500 WT
1992-1995 Chevrolet K2500 Suburban Base
1995 Chevrolet K2500 Suburban LS
1995 Chevrolet K2500 Suburban LT
1992-1994 Chevrolet K2500 Suburban Silverado
1980-1981 Chevrolet K30 Cheyenne
1981-1986 Chevrolet K30 Custom
1980 Chevrolet K30 Custom Deluxe
1981 Chevrolet K30 Deluxe
1980-1986 Chevrolet K30 Scottsdale
1980-1986 Chevrolet K30 Silverado
1994-1995 Chevrolet K3500 Base
1988-1995 Chevrolet K3500 Cheyenne
1988-1992 Chevrolet K3500 Scottsdale
1988-1995 Chevrolet K3500 Silverado
1980 Chevrolet K5 Blazer Cheyenne
1981-1986 Chevrolet K5 Blazer Custom
1980 Chevrolet K5 Blazer Custom Deluxe
1981 Chevrolet K5 Blazer Deluxe
1984 Chevrolet K5 Blazer Scottsdale
1980-1986 Chevrolet K5 Blazer Silverado
1980-1981 Chevrolet Malibu Base
1980-1983 Chevrolet Malibu Classic
1980 Chevrolet Malibu Classic Estate
1980-1981 Chevrolet Malibu Classic Landau
1980 Chevrolet Malibu Classic Sport
1980 Chevrolet Malibu Estate
1980 Chevrolet Malibu Sport
1981-1988 Chevrolet Monte Carlo Base
1983 Chevrolet Monte Carlo CL
1980-1981 Chevrolet Monte Carlo Landau
1986-1988 Chevrolet Monte Carlo LS
1980 Chevrolet Monte Carlo Sport
1983-1988 Chevrolet Monte Carlo SS
1980-1989 Chevrolet P20 Base
1980-1985,1987-1989 Chevrolet P20 Step-Van
1980-1996,1998 Chevrolet P30 Base
1980-1985,1987-1990 Chevrolet P30 Step-Van
1987 Chevrolet R10 Custom Deluxe
1987 Chevrolet R10 Scottsdale
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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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
SKU: 55652860647

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4.1 ★★★★★
Based on 16 reviews
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Product Reviews
R
Verified Purchase
R. Howell
Pawtucket, US
★★★★★ 5
Basic mouse that works - - for now.
Size: 1 Pack, Style: USB Receiver, Color: Blue
I ordered this mouse (in blue) to replace the recently deceased exact same model that I've used for the past 2 or 3 years. I like the simplicity of the M185 mouse and mostly the best bang for your buck! I caught this one on sale for less than a ten-spot, so I thought, "why not." I'm hoping that this one will last a bit longer than my two previous M185 models, that averaged about 3 years each. This model seems plagued by a short life span and is predisposed to mysteriously and suddenly dying, without any obvious symptoms or warning of any kind - - you're working and clicking along, going about your day, when suddenly the cursor on the computer screen freezes and that's it. Nothing, zero, nada. Funny thing, I'm very careful not to abuse or drop the mouse, and keep a fresh battery installed and watch for leakage and all that stuff - - they just stop working, and I assume it is caused by some sort of inherent electronic fault in the circuitry of the previous M185's. Due to my loyalty to the brand and model (and since it was on sale) I decided to give it one more shot. They say that "third time's a charm". I like the fact that the M185 is simple and uncluttered with extra buttons that I would never use for my purpose, which is simple web-browsing and the occasional text document production. The feel is solid, not heavy, but not cheap feeling, either. I'm used to the shape of this mouse, which to me is quite comfortable for long sessions, another reason why I kind of wanted to stay with this model. The buttons have an audible "click", which doesn't bother me at all, and the wheel moves smoothly and also has a clicking operation (which I rarely ever use). The overall surface of the mouse has a matte finish, but like my previous models I'm sure it will eventually wear shiny spots where my fingers reside and will attain a more "well-used" look in time. Connecting it was a breeze, too. I just plugged the dongle into a spare rear usb port of my desktop, and the mouse connected instantly, no problem. The dongle can be stored safely inside the battery compartment, so you can take the whole thing out of the house if needed for use elsewhere. The speed of 1000 dpi seems just right for my purposes. The one I ordered even came with its own AA Duracell battery, which I wasn't really expecting. This mouse also enters "sleep mode" when you don't use it for a while, and I can't say how many times I've got up and left it on all night. And that's not hard to do, as I'll explain next. The only real negative to this mouse is the absence of any easily visible status indicator of it's on / off switch. The rear housing of this mouse is matte black, including the tiny switch where you turn it on and off with your fingernail, with only a very faint "on" lettering (also black), and very hard to see with my aging eyes. The laser is not lighted or visible when on, also adding to the confusion, especially in a darkened room. So, as a workaround, I took a tiny drop of green paint and placed it down inside the switch slider to visibly help indicate the "on" position, and likewise a dot of bright orange for the "off" position. Many of Logitech's more expensive models (and a few other manufacturers) include this color-coded switch indication. I guess for the $$, they had to cut corners somewhere - - a minor complaint. In summary, this is a good basic mouse that works - - let's hope that this one will last longer than its two predecessors.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 17, 2023
A
Verified Purchase
A. Kast
Phoenix, US
★★★★★ 5
My favorite mouse ever
Style: Right-Handed, Pattern Name: Mouse, Color: Off White
I'm very particular when it comes to mice. It has to be: - quiet click and scroll - scroll wheel, not track ball - bluetooth - vertical - real battery, NOT rechargeable There are actually several mice that fit all those criteria, and I've tried nearly all. This Logitech is double the price of most of the others, but for me well worth it. Prior to this I used the Mojo which is about half the price, and that mouse is probably my 2nd favorite but it is a distant second. Compared to the Mojo and others, this mouse has more precise movement, smoother scrolling, and more reliable clicks. Because of the vertical orientation, my finger tends to click diagonally downward with gravity instead of fully horizontal in line with the intended click direction. That causes the Mojo to sometimes miss my clicks, forcing me to constrain my finger direction more carefully, often requiring several tries just to click something. But this Logitech has no such issue, it's very responsive every time even with my sloppy clicks. So while I used to think the Mojo was the best I could find given my requirements, this Logitech is clearly better. When I spend all day at the computer, these minor things make a big difference to me, therefore well worth the extra money. Also want to mention I'm 6' 4" tall and the size of this mouse is fine for me. It is a little smaller than some others, but it feels fine in my hand, it's not abnormally tiny or anything. I was concerned because the description says it's intended for smaller hands and suggested I should get their larger MX Vertical model instead. I would have considered it but the MX Vertical has a rechargeable battery which is a deal-breaker for me. What's my beef with rechargeable batteries? Earlier I had the Seenda vertical mouse but its rechargeable battery died after a year, unable to recharge, so I figured it was a fluke and bought another, and same thing happened after a few months. So after that I switched to replaceable batteries and never looked back. Replaceable batteries last forever (well, they only last a year too, but then you just replace the battery!). I've been very happy using replaceable batteries, way more reliable and durable, because all rechargeables die eventually, and it is easier to replace a battery than an entire mouse! So in summary, if you're price sensitive you could get a usable vertical mouse for less. But if you're OK to spend a little more for a tool you might well use all day for years, then this one is totally worth it IMO.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 27, 2025
D
Verified Purchase
DianeH
Boise, US
★★★★★ 5
Don't Delay - Get One
Style: Right-Handed, Pattern Name: Mouse, Color: Graphite
Make sure you get the right size - I got the Small/Med. Perfect fit. Have had tennis elbow for years and the computer use exacerbated the issue. Very comfortable, great fit. The best position for your hand is in the upright position. Would recommend one for everyone. Good, solid mouse.
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Reviewed in the United States on April 10, 2026
A
Verified Purchase
Anymuon
Pawtucket, US
★★★★★ 5
Bad auto driver install. Great mouse. Few of the left hand mfgs.
Style: Left-Handed, Pattern Name: Mouse, Color: Graphite
Really crappy auto driver install. Locked up my USB ports for my usb keyboard, usb mouse, all usb ports in fact. Had to reboot multiple times with an old style 5pin keyboard since the software screwed up my usb ports. All of them. Lucky I have a motherboard with an old style keyboard port. A reboot of W11 in safe mode, ripped out auto-installed software, registry keys and rebooted to regain control of my USB ports. I do not know what went wrong. Alls I know is Logitech loaded something, it locked up my USB ports and I had to rip everything Logitech out to get control again. I downloaded the software, installed it and it worked fine. I've had no problems since. I'm an old lefty and as such am ambidextrous in most areas, since there just was not left handed oriented items readily available. You had to have left handed stuff made so you learned to do things right handed. I've developed carpal tunnel in both elbows and had purchased a couple of vertical mice, one left and one right. I took the left into work and was looking for a replacement. My other two were around $30 ea. I liked the right handed vertical mouse (Anker). They do not make a left handed version. The left handed mouse is ok, not as good as the Anker. I decided to go above my spend tolerance and get the Logi after reading many reviews. It has not disappointed me. The auto-install sucked. Never letting that happen again. It is a nice smooth mouse. Fine movements that are easily adjustable. The hand position is excellent. I can use this all day without switching to the right because of elbow pain. If you have the pain, you know what I am talking about when it flares. It takes some getting used to the subtlety of the clicks when coming from lower cost mice. Soft and gently like a newborn's .... One of my big criteria for a vertical mouse is a landing area for the outer two fingers (pinky and next to pinky for finger orientation challenged). When you go to a vertical mouse, it takes some adjustment to moving the mouse since you can't really press down with your palm and inside two fingers (the ones next to the outside two fingers). It is helpful to be able to use the two outer fingers and thumb to aid in moving the mouse. You have to experience a vertical mouse to understand. The right handed only Anker goes from an inch to a half inch in the length of my pinky below the buttons on the side. This is a really nice landing area for the outside fingers to assist moving the mouse around. You can squeeze a little and the mouse glides. The Logi mouse is a wee shorter than the Anker and the area below the buttons in a mostly straight 3/4". Both mice curve quickly down to the inside below this area. I was used to a vertical mouse by the time I purchased the Logi and I have no issues with the pinky dragging the table and the finger next to pinky resting on the landing. I move the mouse with no problems. It is the subtlety of how one interacts with these style of mice. The big plus, takes a long time before mouse use causes pain flareups. And this isn't just a pain and done. Depending on how one ignores the pain, often determines how many days life sucks. The Logi mouse minimizes the flare ups. I'm thinking of taking the Anker in and getting a right handed Logi for home. I like the Anker, I'm frugal and highly recommend it for getting your feet wet. I love the Logi (auto-install sucks) and will probably ignore my frugal tendencies and get a right handed one since I don't switch hands as frequently with the Logi in the mix. Don't have to suffer auto-install either.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 29, 2024
L
Verified Purchase
Lauren
Houston, US
★★★★★ 5
Pretty in Pink
Style: Right-Handed, Pattern Name: Mouse, Color: Rose, Style: Right-Handed, Pattern Name: Mouse, Color: Rose
Logitech is a great brand, so that is why I trusted in throwing down the money for this mouse. It feels great, easy to use and the battery life is wonderful! Good quality, abd was very easy to connect to my personal and work laptop!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026

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