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Description
Holley EFI Dual Sync BBC Tall Deck Distributor - 565-204Overview: Introducing the next generation of Holley EFI Dual Sync Distributors, the new design features an improved shutter wheel, high quality dual Hall Effect sensors, and an MSD cap and rotor! While these distributors are designed to be used primarily in sequentially injected installations, you can easily use them as a crank trigger for TBI system also. The precision machined shutter wheel design ensures accurate timing, even at very high engine
Overview:
Introducing the next generation of Holley EFI Dual Sync Distributors, the new design features an improved shutter wheel, high-quality dual Hall Effect sensors, and an MSD cap and rotor!
While these distributors are designed to be used primarily in sequentially injected installations, you can easily use them as a crank trigger for TBI system also. The precision machined shutter wheel design ensures accurate timing, even at very high engine speeds. The Gen 2 Dual Sync also included a QPQ coated shutter wheel for superior corrosion resistance, and the wheel has been pinned and welded to the shaft for increased reliability. These distributors can also be used with other EFI systems that support Hall Effect crank and cam sensor inputs. Do you need to a bronze gear for your billet cam? No problem, these distributors maintain MSD shaft diameters, making it easy to source a bronze gear!
Features:
- Plug and Play with Holley EFI
- Includes both crank and cam sensors to support sequential EFI operation
- Hall Effect sensor design provides precise timing control and noise immunity
- CNC machined billet aluminum housing
- Integrated LEDs allow for easy setup
- Available for popular applications
- Comes with hardened steel distributor gear
- Precision machined shutter wheel designed for improved accuracy at extreme engine RPM
- Shutter wheel is pinned and welded to distributor shaft for superior reliability
- Blank cap available for Coil-On-Plug applications
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| 1991 - 1995 | Chevrolet | C2500 | 454/7.4 V8 | |
| 1992 - 1995 | Chevrolet | C2500 Suburban | 454/7.4 V8 | |
| 1975 - 1986 | Chevrolet | C30 | 454/7.4 V8 | |
| 1988 - 1995 | Chevrolet | C3500 | 454/7.4 V8 | |
| 1970 - 1976 | Chevrolet | Caprice | 454/7.4 V8 | |
| 1975 | Chevrolet | El Camino | Base | 454/7.4 V8 |
| 1976 | Chevrolet | G20 | Beauville | 454/7.4 V8 |
| 1976 | Chevrolet | G20 | Chevy Van | 454/7.4 V8 |
| 1975 - 1996 | Chevrolet | G30 | Beauville | 454/7.4 V8 |
| 1970 - 1974 | Chevrolet | El Camino | 454/7.4 V8 | |
| 1970 - 1972 | Chevrolet | El Camino | 402/6.6 V8 | |
| 1973 - 1974 | Chevrolet | G10 Van | Base | 454/7.4 V8 |
| 1973 - 1974 | Chevrolet | G20 Van | 454/7.4 V8 | |
| 1973 - 1974 | Chevrolet | G30 Van | Base | 454/7.4 V8 |
| 1963 - 1969 | Chevrolet | Impala | 427/7 V8 | |
| 1965 - 1969 | Chevrolet | Impala | 396/6.5 V8 | |
| 1966 - 1967 | Chevrolet | Impala | Base | 396/6.5 V8 |
| 1966 - 1967 | Chevrolet | Impala | Base | 427/7 V8 |
| 1966 - 1967 | Chevrolet | Impala | SS | 396/6.5 V8 |
| 1966 - 1967 | Chevrolet | Impala | SS | 427/7 V8 |
| 1970 - 1976 | Chevrolet | Impala | 454/7.4 V8 | |
| 1970 - 1972 | Chevrolet | Impala | 402/6.6 V8 | |
| 1968 - 1969 | Chevrolet | K10 Pickup | 396/6.5 V8 | |
| 1975 - 1986 | Chevrolet | C20 | 454/7.4 V8 | |
| 1973 - 1986 | Chevrolet | C20 Suburban | 454/7.4 V8 | |
| 1990 - 1993 | Chevrolet | C1500 | Cheyenne | 454/7.4 V8 |
| 1990 - 1993 | Chevrolet | C1500 | Silverado | 454/7.4 V8 |
| 1990 - 1993 | Chevrolet | C1500 | 454 SS | 454/7.4 V8 |
| 1990 - 1993 | Chevrolet | C1500 | WT | 454/7.4 V8 |
| 1970 - 1975 | Chevrolet | Bel Air | 454/7.4 V8 | |
| 1976 - 1978 | Chevrolet | K5 Blazer | 454/7.4 V8 | |
| 1975 - 1980 | Chevrolet | C10 | 454/7.4 V8 | |
| 1973 - 1974 | Chevrolet | K10 Pickup | 454/7.4 V8 | |
| 1968 - 1969 | Chevrolet | K10 Suburban | 396/6.5 V8 | |
| 1970 - 1972 | Chevrolet | K10 Suburban | 402/6.6 V8 | |
| 1973 - 1974 | Chevrolet | K10 Suburban | 454/7.4 V8 | |
| 1968 - 1969 | Chevrolet | K20 Pickup | 396/6.5 V8 | |
| 1970 - 1972 | Chevrolet | K20 Pickup | 402/6.6 V8 | |
| 1973 - 1974 | Chevrolet | K20 Pickup | 454/7.4 V8 | |
| 1968 - 1969 | Chevrolet | K20 Suburban | 396/6.5 V8 | |
| 1970 - 1972 | Chevrolet | K20 Suburban | 402/6.6 V8 | |
| 1973 - 1985 | Chevrolet | K20 Suburban | 454/7.4 V8 | |
| 1968 - 1969 | Chevrolet | K30 Pickup | 396/6.5 V8 | |
| 1970 - 1972 | Chevrolet | K30 Pickup | 402/6.6 V8 | |
| 1973 - 1974 | Chevrolet | K30 Pickup | 454/7.4 V8 | |
| 1969 | Chevrolet | Kingswood | 396/6.5 V8 | |
| 1969 | Chevrolet | Kingswood | 427/7 V8 | |
| 1970 - 1972 | Chevrolet | Kingswood | 454/7.4 V8 | |
| 1970 - 1972 | Chevrolet | Kingswood | 402/6.6 V8 | |
| 1973 - 1975 | Chevrolet | Laguna | 454/7.4 V8 | |
| 1965 - 1967 | Chevrolet | Malibu | 396/6.5 V8 | |
| 1973 - 1980 | Chevrolet | C10 Suburban | 454/7.4 V8 | |
| 1990 | Chevrolet | C1500 | Scottsdale | 454/7.4 V8 |
| 1965 - 1967 | Chevrolet | Chevelle | Base | 396/6.5 V8 |
| 1965 - 1968 | Chevrolet | Chevelle | SS | 396/6.5 V8 |
| 1967 | Chevrolet | Chevelle | Deluxe | 396/6.5 V8 |
| 1967 - 1968 | Chevrolet | Chevelle | Concours | 396/6.5 V8 |
| 1968 | Chevrolet | Chevelle | 300 | 396/6.5 V8 |
| 1968 | Chevrolet | Chevelle | 300 Deluxe | 396/6.5 V8 |
| 1968 | Chevrolet | Chevelle | Malibu | 396/6.5 V8 |
| 1968 | Chevrolet | Chevelle | Nomad | 396/6.5 V8 |
| 1969 - 1970 | Chevrolet | Chevelle | 396/6.5 V8 | |
| 1970 - 1973 | Chevrolet | Chevelle | 454/7.4 V8 | |
| 1970 - 1972 | Chevrolet | Chevelle | 402/6.6 V8 | |
| 1968 | Chevrolet | Chevy II | 396/6.5 V8 | |
| 1965 | Chevrolet | Corvette | 396/6.5 V8 | |
| 1966 - 1969 | Chevrolet | Corvette | 427/7 V8 | |
| 1970 - 1974 | Chevrolet | Corvette | 454/7.4 V8 | |
| 1966 - 1970 | Chevrolet | El Camino | 396/6.5 V8 | |
| 1970 - 1972 | Chevrolet | Camaro | SS | 402/6.6 V8 |
| 1966 - 1969 | Chevrolet | Caprice | 396/6.5 V8 | |
| 1966 - 1969 | Chevrolet | Caprice | 427/7 V8 | |
| 1970 - 1972 | Chevrolet | Caprice | 402/6.6 V8 | |
| 1989 - 1991 | Chevrolet | V3500 | 454/7.4 V8 | |
| 1993 | GMC | K2500 Suburban | SLE | 454/7.4 V8 |
| 1963 - 1 |
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- Free Standard Shipping on $100+ Orders to the USA.
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4.3 ★★★★★
Based on 8 reviews
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Product Reviews
★★★★★ 5
Keeping the crusty heels at bay!
Color: Cotton Gray, Size: Regular
I deal with chronic dry heels that crack if left unmanaged. I bought these in hopes that when I do soak and scrub my heels that I can keep the cracking at bay. These have been a godsend. I wear them every night and my heels are nice and soft. I plan on purchasing more.
A couple of things I have noticed, if I wear these during the day, the bottom of my feet do seem to sweat and there is some slipping. I have only washed these are directed (hand washing) and you will want to after a couple washes because it could give a sweaty feet smell. Overall, I highly recommend.
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Reviewed in the United States on March 21, 2026
★★★★★ 5
Moisturized heels out of the box
Color: Fuzzy Lilac Purple, Size: Regular
Work without adding anything to your feet, but there are extra nice if you wanted to add a moisturizer to you heel and not get it all over your socks. Worth the money!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026
★★★★★ 5
Transformative for Dry, Cracked Heels!
Color: Original Grey
I recently purchased Dr. Frederick's Original Moisturizing Heel Socks, and they have truly transformed the condition of my feet! I can’t recommend them highly enough.
Effective Moisturization: These socks are infused with moisturizing agents that work wonders. After just a few uses, I noticed a significant reduction in dryness and cracking on my heels. My feet feel softer and smoother, and I love that I can wake up to beautifully moisturized skin.
Comfortable Fit: The socks are incredibly comfortable to wear, with a snug yet gentle fit. I appreciate that they don’t feel restrictive, allowing me to walk around my home while wearing them without any discomfort. They are also lightweight, making them easy to slip on before bed.
User-Friendly: They are super easy to use—just wear them overnight, and let the socks do their magic. I love the simplicity of incorporating them into my nighttime routine.
Durable Quality: The quality of the socks is impressive. They wash well and have maintained their shape and effectiveness after multiple uses. I feel confident that they will last a long time.
Final Thoughts: If you're struggling with dry, cracked heels, I highly recommend Dr. Frederick's Original Moisturizing Heel Socks. They are a fantastic investment in foot care and have made a noticeable difference in the health of my skin. These socks have become a must-have in my self-care routine!
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Reviewed in the United States on October 4, 2024
★★★★★ 5
These worked for me!
Color: Original Grey
They worked great. I bought these for cracked sore heels. It took 2-3 weeks but my heels no longer hurt and the cracks have closed and look more like an indention than a crack now. They feel so much better, but I'll probably wear them another week just to be sure they stay healed. They look and feel like regular socks from the outside but only cover the heel with the toe open. Not think but not thick, again like regular socks. They would probably be slippery on a smooth surface the same as socks. The inside feels like rubber or something smooth at the heel. I have washed them once each pair and accidentally dried one pair in the dryer. They still seem to feel the same so I think they're fine. They're pretty inexpensive and had different colors and sizes.
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Reviewed in the United States on February 10, 2026
★★★★★ 4
Truly Helped My Cracked Heels
Color: Original Grey
I didn't include a photo cause they look exactly like their advertisement photo.
I so liked the silicon-type heel lining as it kept the heel-repair cream on my heel and did not get soaked up by the sock. But, it is so, so slippery when walking around in them! Take care to be mindful when you set each foot down as the lotion can slide your heel across the sock quite a bit. If these socks were for an elderly person, I would have them only sit while using the sock - no walking around for fear of falling.
I have larger ankles and found that having both the top and the bottom hems/elastic, etc. the same size to be quite troublesome and was not a nice feeling or fit on my upper hem that hit my ankle. Don't get me wrong, I am so glad that I got them and I continue to use them and they are helping my horribly-cracked heels greatly, but I find that I have to keep moving the top hem up and down so that it doesn't stay in one position as it cuts in to my ankle.
My feedback and advice might be to please make the upper hem somewhat larger than the one that is on the bottom and goes over my actual foot. They really should not be the same circumference...or else make different sizes - S, M, L, etc. That's really my only complaint or "con" to ordering these.
I think they are a great concept and I like the fact that I can throw them in the washer and dryer.
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Reviewed in the United States on June 8, 2024
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