The Buckshot Racing #77 Mercury V6 Powerhead Stud Kit is designed for compatible Mercury and Mariner 2.0L, 2.4L, and 2.5L V6 two-stroke outboards using the standard or stock production midsection commonly referred to as a fishing mid or bass mid.
Typical applications include many Mercury 135 HP, 150 HP, 175 HP, and 200 HP V6 engines, along with XR2, XR4, XR6, XRi, Laser EFI, Magnum, and selected 225 Pro Max combinations using the correct standard-midsection mounting arrangement.
Customers can choose between two complete hardware packages: the lightweight 31-piece Buckshot Racing #77 Titanium Stud Kit or the more traditional 30-piece Mercury OEM Galvanized Steel Stud Kit.
Option 1 – 31-Piece Titanium Powerhead Stud Kit
The premium Buckshot Racing #77 version replaces the original steel powerhead studs with Ti-6Al-4V titanium studs designed for reduced weight, excellent corrosion resistance, and improved serviceability in high-performance marine applications.
Six (6) 2.00" titanium studs (replaces 847530) for the short front and rear block positions
Two (2) 5.75" titanium studs (replaces 847532) for the mid-side positions
Two (2) 6.75" titanium studs (replaces 847533) for the longer front-side positions
Eight (8) extra-thick, case-hardened Mercury OEM 856774 washers
Eight (8) stainless-steel Nylock nuts for the side and rear studs
Two (2) stainless-steel flat washers for the front studs
Two (2) thin stainless-steel Nylock jam nuts for the front studs
One (1) 5/32" Allen wrench for stud installation and removal
The titanium studs feature a broached 5/32" SAE hex socket in the end, allowing the installer to thread the studs in or remove them with an Allen wrench rather than gripping the stud body with pliers or locking nuts.
Option 2 – 30-Piece Mercury OEM Galvanized Steel Stud Kit
For stock restorations, fishing boats, bass boats, and builders who prefer the factory-style stud material, Buckshot Racing #77 also offers a 30-piece Mercury OEM galvanized steel powerhead stud kit.
This option retains the original Mercury-style galvanized steel stud construction while using the same premium locking hardware and factory-spec powerhead washers.
Six (6) 2.00" Mercury OEM galvanized steel studs – 847530
Two (2) 5.75" Mercury OEM galvanized steel studs – 847532
Two (2) 6.75" Mercury OEM galvanized steel studs – 847533
Eight (8) extra-thick, case-hardened Mercury OEM 856774 washers
Eight (8) stainless-steel Nylock nuts for the side and rear studs
Two (2) stainless-steel flat washers for the front studs
Two (2) thin stainless-steel Nylock jam nuts for the front stud
The OEM kit contains 30 pieces because the factory galvanized studs do not require the separate Allen installation wrench included with the titanium kit.
This is the best choice for customers who want Mercury OEM galvanized steel studs while still upgrading the exposed mounting hardware to corrosion-resistant stainless locking nuts and washers.
Mercury OEM 856774 Powerhead Washers
Both kits use eight genuine Mercury OEM 856774 extra-thick, case-hardened powerhead washers.
These are not generic hardware-store flat washers. The thicker Mercury washer is designed to provide the correct bearing surface beneath the powerhead mounting hardware and distribute clamping load at the adapter plate.
The 856774 / 12-856774 washer is an important part of maintaining the proper Mercury mounting hardware stack, especially on engines that see repeated powerhead removal or high-performance use.
Titanium Construction & Weight Reduction
The Buckshot Racing #77 titanium studs are manufactured from Ti-6Al-4V, one of the most widely used high-strength titanium alloys in aerospace, motorsports, and performance engineering.
Ti-6Al-4V offers an excellent strength-to-weight ratio and substantially lower density than steel while providing outstanding corrosion resistance in marine environments.
The primary benefits are reduced hardware weight, excellent resistance to corrosion and easier long-term service. The advantage is not a direct horsepower increase; it is removing unnecessary weight while upgrading a critical set of engine fasteners.
Rainbow PVD Surface Treatment
The titanium version receives a Rainbow PVD finish for additional surface protection and a distinctive appearance. The coating complements the inherent corrosion resistance of Ti-6Al-4V rather than replacing it.
PVD, or Physical Vapor Deposition, creates a very thin, hard surface coating that can improve wear resistance and reduce friction at the treated surface. This is particularly useful on threaded hardware that may be installed and removed repeatedly during race-engine service.
Standard Fishing / Bass Midsection Fitment
These kits are engineered for the standard Mercury V6 production midsection.
That distinction is important. Mercury Racing, offshore, and short-mid configurations can use different adapter plates, exhaust housings, and stud lengths.
Do not assume this kit fits a 15-inch race mid, ROS midsection, offshore exhaust housing or specialty Mercury Racing midsection simply because the powerhead is a 2.0L, 2.4L or 2.5L V6.
Fitment should be confirmed by the actual midsection and existing stud lengths, particularly on older performance boats where powerheads and mids may have been changed over the years.
Mercury Part Number Cross References
These kits are associated with or replace hardware in the following Mercury / Mariner powerhead mounting families: 8M0034437, 847532, 96910, 8M0034443, 847530, 97008, 78438, 784384, 784385, 8M0034454, 12-70833, 12-45175, 12-F1778, 2550W23059, F1778, 45175, 70833, 856774, 12-856774 and 8M0214963.
Because Mercury used different stud arrangements across production and racing midsections, these numbers should be treated as fitment and service references, not an indication that every number is used simultaneously on every engine.
Buckshot Racing #77 Installation Tech Tip
Whenever the powerhead is removed, inspect the studs, adapter plate, base gasket, and threaded mounting locations together.
Clean the threaded holes before installation and make sure each stud reaches the correct installed depth without bottoming in a blind hole. Do not use the stud as a bolt by heavily torquing it into the block.
Contact Mike Hill at +1-714-697-1716 for technical support.