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Description
Holley 565-303 Sniper EFI HyperSpark Distributor Ford 351C 429 460 Hall Effect COverview: Do you need to upgrade your ignition system due to a recent Sniper EFI installation, but have no idea which option is best? Introducing HyperSpark Ignition, from Sniper EFI. The complete system consists of a CD Ignition Box, Billet distributor with Hall effect crank signal sensor, an ignition coil, and complete wiring harness ready to plug and play with your Sniper EFI System. Hyperspark CD Ignition Box (556 152) and Ignition Coil (556 151)
Overview:
Do you need to upgrade your ignition system due to a recent Sniper EFI installation, but have no idea which option is best?
Introducing HyperSpark Ignition, from Sniper EFI. The complete system consists of a CD Ignition Box, Billet distributor with Hall effect crank signal sensor, an ignition coil, and complete wiring harness ready to plug and play with your Sniper EFI System.
Hyperspark CD Ignition Box (556-152) and Ignition Coil (556-151) sold separately.
Features:
- Hall Effect crank trigger sensor housing provides a noise-free RPM signal to the Sniper ECU
- Billet distributor housing provides corrosion resistance and stylish looks!
- Patented Clear Installation cap eliminates any confusion while installing the distributor.
- Easiest plug and play way to add timing control to a Sniper EFI Installation.
- Distributor shutter wheel is pinned and welded to the shaft, for decades of reliable accuracy.
- Includes Wire Retainer for a clean installation.
- Comes with Cast Gear Installed - contact camshaft manufacturer for recommended gear material.
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| 1972 - 1974 | Ford | Country Squire | 460/7.5L V8 | |
| 1969 - 1973 | Mercury | Monterey | 429/7L V8 | |
| 1969 - 1974 | Ford | Ranch Wagon | 351/5.8L V8 | |
| 1970 - 1973 | Ford | Ranchero | 429/7L V8 | |
| 1973 - 1996 | Ford | F-250 | 460/7.5L V8 | |
| 1970 - 1971 | Ford | Mustang | Mach 1 | 429/7L V8 |
| 1970 - 1972 | Ford | Mustang | Mach 1 | 351/5.8L V8 |
| 1969 - 1974 | Mercury | Montego | 351/5.8L V8 | |
| 1972 - 1974 | Ford | LTD | 460/7.5L V8 | |
| 1973 - 1997 | Ford | F-350 | 460/7.5L V8 | |
| 1969 - 1973 | Ford | LTD | 429/7L V8 | |
| 1969 - 1973 | Ford | Galaxie 500 | 429/7L V8 | |
| 1975 - 1996 | Ford | E-350 Econoline | 460/7.5L V8 | |
| 1969 - 1973 | Ford | Country Squire | 429/7L V8 | |
| 1964 - 1967 | Cadillac | Commercial Chassis | 429/7L V8 | |
| 1972 | Ford | Custom | 460/7.5L V8 | |
| 1969 - 1973 | Ford | Custom 500 | 429/7L V8 | |
| 1975 - 1976 | Ford | Elite | 460/7.5L V8 | |
| 1972 - 1973 | Ford | Torino | 429/7L V8 | |
| 1968 - 1973 | Ford | Thunderbird | 429/7L V8 | |
| 1969 - 1973 | Mercury | Colony Park | 429/7L V8 | |
| 1969 | Mercury | Comet | 351/5.8L V8 | |
| 1977 - 1996 | Ford | E-350 Econoline Club Wagon | 460/7.5L V8 | |
| 1969 - 1973 | Ford | Ranch Wagon | 429/7L V8 | |
| 1970 | Ford | Falcon | 429/7L V8 | |
| 1970 - 1971 | Ford | Torino | Squire | 429/7L V8 |
| 1975 - 1976 | Ford | LTD | Brougham | 460/7.5L V8 |
| 1975 - 1978 | Ford | LTD | Country Squire | 460/7.5L V8 |
| 1968 - 1971 | Lincoln | Mark III | 460/7.5L V8 | |
| 1972 - 1974 | Ford | Custom 500 | 460/7.5L V8 | |
| 1975 - 1991 | Ford | E-250 Econoline Club Wagon | 460/7.5L V8 | |
| 1970 - 1971 | Ford | Torino | Base | 429/7L V8 |
| 1974 - 1976 | Ford | Ranchero | 460/7.5L V8 | |
| 1969 - 1971 | Mercury | Cyclone | 429/7L V8 | |
| 1973 - 1976 | Mercury | Cougar | 460/7.5L V8 | |
| 1971 - 1986 | DeTomaso | Pantera | 351/5.8L V8 | |
| 1970 - 1971 | Ford | Torino | GT | 429/7L V8 |
| 1977 - 1978 | Lincoln | Mark V | 460/7.5L V8 | |
| 1969 - 1973 | Ford | Country Sedan | 429/7L V8 | |
| 1970 - 1971 | Ford | Torino | Brougham | 429/7L V8 |
| 1975 - 1978 | Ford | LTD | Base | 460/7.5L V8 |
| 1977 | Ford | Ranchero | GT | 460/7.5L V8 |
| 1970 - 1974 | Mercury | Monterey | 351/5.8L V8 | |
| 1970 - 1971 | Ford | Mustang | Grande | 429/7L V8 |
| 1970 - 1974 | Mercury | Colony Park | 351/5.8L V8 | |
| 1971 - 1974 | Mercury | Cougar | 351/5.8L V8 | |
| 1970 - 1973 | Mercury | Marquis | 429/7L V8 | |
| 1972 - 1974 | Mercury | Colony Park | 460/7.5L V8 | |
| 1972 - 1974 | Mercury | Monterey | 460/7.5L V8 | |
| 1969 - 1974 | Ford | LTD | 351/5.8L V8 | |
| 1969 - 1974 | Ford | Ranchero | 351/5.8L V8 | |
| 1968 - 1978 | Lincoln | Continental | 460/7.5L V8 | |
| 1969 - 1972 | Ford | Custom | 429/7L V8 | |
| 1964 - 1967 | Cadillac | Eldorado | 429/7L V8 | |
| 1969 - 1974 | Ford | Country Sedan | 351/5.8L V8 | |
| 1972 - 1976 | Ford | Thunderbird | 460/7.5L V8 | |
| 1969 - 1971 | Mercury | Cyclone | 351/5.8L V8 | |
| 1969 - 1970 | Ford | Fairlane | 351/5.8L V8 | |
| 1969 - 1974 | Ford | Custom 500 | 351/5.8L V8 | |
| 1972 - 1978 | Mercury | Marquis | 460/7.5L V8 | |
| 1975 - 1979 | Ford | F-150 | 460/7.5L V8 | |
| 1972 - 1976 | Lincoln | Mark IV | 460/7.5L V8 | |
| 1972 - 1974 | Ford | Country Sedan | 460/7.5L V8 | |
| 1973 - 1976 | Mercury | Montego | 460/7.5L V8 | |
| 1970 - 1971 | Ford | Torino | Base | 351/5.8L V8 |
| 1969 - 1974 | Ford | Country Squire | 351/5.8L V8 | |
| 1972 - 1974 | Ford | Torino | 351/5.8L V8 | |
| 1973 - 1979 | Ford | F-100 | 460/7.5L V8 | |
| 1969 - 1972 | Ford | Custom | 351/5.8L V8 | |
| 1971 - 1972 | Ford | Mustang | Boss 351 | 351/5.8L V8 |
| 1969 - 1970 | Mercury | Marauder | 429/7L V8 | |
| 1970 - 1971 | Ford | Torino | Cobra | 429/7L V8 |
| 1965 - 1967 | Cadillac | Calais | 429/7L V8 | |
| 1975 - 1978 | Ford | LTD | Landau | 460/7.5L V8 |
| 1970 - 1973 | Mercury | Montego | 429/7L V8 | |
| 1972 - 1974 | Ford | Ranch Wagon | 460/7.5L V8 | |
| 1975 - 1978 | Mercury | Grand Marquis | 460/7.5L V8 | |
| 1973 - 1976 | Ford | Torino | 460/7.5L V8 | |
| 1969 | Mercury | Marquis | Base | 429/7L V8 |
| 1970 - 1971 | Ford | Torino | Super Cobra Jet | 429/7L V8 |
| 1975 - 1976 | Ford | Custom 500 | Base | 460/7.5L V8 |
| 1964 - 1967 | Cadillac | DeVille | 429/7L V8 | |
| 1970 | Ford | Fairlane | 429/7L V8 | |
| 1971 | Ford | Torino | 500 | 429/7L V8 |
| 1969 - 1970 | Mercury | Cougar | Boss 429 | 429/7L V8 |
| 1970 - 1971 | Ford | Torino | Brougham | 351/5.8L V8 |
| 1970 - 1974 | Mercury | Marquis | 351/5.8L V8 | |
| 1964 | Cadillac | Series 75 Fleetwood | 429/7L V8 | |
| 1970 - 1971 | Ford | Torino | GT | 351/5.8L V8 |
| 1970 - 1972 | Ford | Mustang | Grande | 351/5.8L V8 |
| 1972 - 1973 | Ford | Gran Torino | 429/7L V8 | |
| 1965 - 1967 | Cadillac | Fleetwood | 429/7L V8 | |
| 1975 | Mercury | Montego | MX | 460/7.5L V8 |
| 1969 - 1972 | Ford | Mustang | Base | 351/5.8L V8 |
| 1975 | Mercury | Montego | Brougham | 460/7.5L V8 |
| 1970 - 1971 | Ford | Torino | Squire | 351/5.8L V8 |
| 1969 - 1974 | Ford | Galaxie 500 | 351/5.8L V8 | |
| 1964 | Cadillac | Series 60 Fleetwood | 429/7L V8 | |
| 1971 | Mercury | Cougar | 429/7L V8 | |
| 1968 | Lincoln | Continental | 429/7L V8 | |
| 1969 - 1970 | Ford | Mustang | Boss 429 | 429/7L V8 |
| 1970 | Mercury | Cougar | XR-7 | 429/7L V8 |
| 1972 - 1974 | Ford | Gran Torino | 351/5.8L V8 | |
| 1969 - 1971 | Ford | Mustang | Base | 429/7L V8 |
| 1970 | Ford | Falcon | 351/5.8L V8 | |
| 1971 | Ford | Torino | 500 | 351/5.8L V8 |
| 1975 | Mercury | Montego | Villager | 460/7.5L V8 |
| 1972 - 1974 | Ford | Galaxie 500 | 460/7.5L V8 | |
| 1975 - 1980 | Ford | E-250 Econoline | 460/7.5L V8 | |
| 1973 - 1976 | Ford | Gran Torino | 460/7.5L V8 | |
| 1996 | Ford | Econoline Super Duty | 460/7.5L V8 | |
| 1970 | Mercury | Cougar | Base | 429/7L V8 |
| 1970 | Mercury | Cougar | Cobra Jet | 429/7L V8 |
| 1971 | Ford | Torino | Cobra | 351/5.8L V8 |
| 1964 | Cadillac | Series 62 | 429/7L V8 | |
| 1977 | Ford | Ranchero | 500 | 460/7.5L V8 |
| 1973 | Ford | Mustang | 351/5.8L V8 | |
| 1970 | Mercury | Cougar | Base | 351/5.8L V8 |
| 1969 | Mercury | Marquis | Brougham | 429/7L V8 |
| 1978 | Ford | E-100 Econoline | 460/7.5L V8 | |
| 1970 | Mercury | Cougar | XR-7 | 351/5.8L V8 |
| 1997 | Ford | F-250 HD | 460/7.5L V8 |
Specs:
| Brand | Holley Sniper EFI |
|---|---|
| Color | Shiny |
| Distributor Type | Hall Effect |
| Emission Code | 3 |
| Product Type | Ignition Boxes |
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
4.7 ★★★★★
Based on 11 reviews
Sort
Product Reviews
★★★★★ 5
Stick with Name Brands
Color: Grey
Product arrived as described. I am 47, 5'9" and 195 lbs. I suffer from lower back pain. I am a graphic designer that spends hours in front of the computer. I purchased a less expensive chair, but it made my back feel like it was on fire and I was hobbling around the home like an elderly man. It wa sa gaming chair, with a cool look, but horribly uncomfortable—about $75 less than this chair.
I decided on Serta due to the brand recognition and quality of build. The chair arrived without blemish. It's very easy to assemble, taking me about 20 mins. I am very pleased with the look and quality of the leather. The seat cushion and back rest is quite comfortable. Firm, but soft, not too firm, but not too soft. I spend long hours at my desk and so far my back feels great. No burning, no hobbling. It's worth the extra $50-100 in cost. Happy customer.
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Reviewed in the United States on January 17, 2026
★★★★★ 5
The Most Comfortable Office Chair that I've Owned.
Color: Grey
This is by far the most comfortable office chair that I've ever owned or sat in. I've owned quite a few office chairs. Some big and comfy, some new ergonomic designs, some super expensive, others supplied by my employer, and even 2 other/prior Serta chairs. This, by far beats them all. I first purchased this chair for my wife in her office. She's of average size as well, but she always felt like she was being swallowed by some of the larger, more cushiony office chairs. She wanted to be comfortable, but didn't want to drown in the chair. I purchased this chair for her and she absolutely loves it. It's been a year now, and it's holding up well, looks great, and she has zero complaints. Which brings me to my personal purchase for myself. I'm average size. A little bulky, but not too big. I've been through so many chairs. They all feel great initially, but after a lot of use, I felt uncomfortable, or fatigued from sitting, and even sore. I have some lumbar back issues, and my tail bone occasionally gets sore if I sit too long, especially if I slouch over time. I was ready to buy a new chair, and it takes me forever to decide, however I do really like my wife's chair. So I purchased this chair for myself. I must say, that this chair is the best that I've used. It's not huge. You wouldn't be too comfortable trying to nap in it. But for sitting and working? It's amazing. Perfect lumbar support, super soft on the butt without swallowing you, and keeps you straight, and comfortable. I would definitely recommend this product.
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Reviewed in the United States on June 25, 2024
★★★★★ 4
Petite person's perspective
Color: Grey, Color: Grey
Full name on the box: Light Grey Bonded Leather/Mesh Air Executive Chair (Model: 43807)
This review is from a petite female’s perspective
I was browsing for couple months and this Serta chair stood out to me, mainly aesthetically. I don’t see many chairs in this color or style. It matched with the rest of my PC/desk setup.
Positives
-Seat is comfortable.
-Lumbar support is good. It helps me sit very straight.
-The casters were surprisingly easy to put in. I had to use some force with two of them though. They roll fine on carpet.
-Easy assembly
Neutral/Negatives
-Paint of armrests is easily scratched. I accidentally scratched it while installing the back.
-The black plastic caps used to hide the screws don’t fit well. The plastic inserts for hiding screws in arms don’t fit well either. It makes the chair appear cheap. (I will provide images)
-Craftsmanship isn’t the best. Not noticeable from a distance though.
-At lowest setting, my feet can’t touch the ground but being 4’11” it’s to be expected.
-Height of the back is too high for my liking. I prefer a few inches shorter so I can tilt my head back to rest my neck. My fault for not realizing I should look into "mid-back chairs".
-Head/top area is too firm. I prefer it to be squishy (e.g. Serta Smart Layers Verona or Siena).
As another reviewer mentioned, don’t forget to remove the foam or cardboard behind the lumbar and head/shoulder. That is supposedly the last step when assembly is all done.
**If you come across any issues/warranty, you contact TRUE INNOVATIONS, not Serta. (I will provide images)
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Reviewed in the United States on December 21, 2017
★★★★★ 1
***Serta should recall this chair!
Color: Grey
Serta quality and comfortable for office use only, casual home use isn't the same... the only reason I didn't give it 5 stars for ergonomics is that if you are not sitting upright in "office mode" and you want to slouch and relax, the seat makes you feel like you are always sliding forward in the chair? I assume that is because it's an "ergonomic" chair, but it is well built and worth the price in my opinion.
***Updated addition; after using the chair to work from home & casual use, it is still annoying to feel like it tilts forward unless you are sitting up perfectly straight! I have also noticed that if you get up or reposition yourself (due to the forward sliding) the seat height resets itself back up to the top!? So when you sit back down you have to lower the seat again... my last Serta chair never had these issues!! For the price point, this shouldn't be a chair I will be replacing after a few months - but not with another Serta!
****Second update = now 1 star! (Chair still looks new, I only work from home 1 day a week, and take great care of my things so there is no damage or even usage wear) After trying to make the best of this chair, it is even more annoying to use.. it now "groans" when any movement rocking back or forth... it still feels like it is forcing you to slide forward and feels like the chair wants your to fall out! Leaning back doesn't stay (no adjustment to keep from "leaning forward") so no matter what I do, I hate sitting in this chair more every day... and now I am very worried about buying another chair blind online!
***Serta should recall this chair!
*****Third update = Chair still looks and feels brand new, but now randomly will make weird creaking and groaning noises with every movement and as an added bonus it randomly just sinks to the lowest level without warning!!! Typing away and it just starts sinking until it hits bottom!
I don't know how an expensive chair could be so awful!!
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Reviewed in the United States on March 1, 2024
★★★★★ 5
Office chair
Color: Grey
I bought this chair for my son and he’s very happy with the comfort of it.
Very sturdy
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Reviewed in the United States on May 1, 2026
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