Brodix Cylinder Heads
B1 BS
The B1 BS head was designed as a direct replacement for the Mopar factory steel head. These heads do require special rocker arms and longer pushrods, but are oiled internally like factory heads. Standard big-block intakes, headers, and valve covers are compatible with these cylinder heads. These heads offer a well designed quench-style combustion chamber and large 2.20-inch intake and 1.81-inch exhaust valves. We utilized a ported set of these heads on a 499ci race wedge and had no trouble getting our '91 Daytona into the 8s.
The Brodix B1 line of cylinder heads are proven power makers. We utilized this set of B-1 BS heads on a 500-inch bracket engine and got friend Jeff Manning's '91 Daytona chassis car into the 8s. For high-horsepower, large-displacement engines, the B-1 original heads are also a good choice. | 
B1 Heads do require special rocker arms, but the BS units (shown here) utilize standard intakes, headers, and valve covers. Original B1 heads are geared more toward the serious racer and work well on large cubic-inch, high-rpm engines. | 
We've found the B1 BS heads to be reliable power makers in both street/strip vehicles and bracket cars. These heads utilize hardened valve seats for unleaded fuel and are cast from quality A-356 virgin aluminum, so repairs are easy if necessary. For serious racers, the original B1 heads are a great option. |
Original B1
The original B1 cylinder head for the big-block Mopar has earned a reputation for the ability to make high horsepower. Large 2.30-inch intake and 1.78-inch exhaust valves, combined with intake flow in excess of 400 cfm, combine to make these aluminum heads serious performers. however, these units are not intended to simply bolt-on to your big-block and require special pistons and rocker arms, as well as a special intake manifold. These heads have a thick deck making them a good choice for nitrous applications and are also available in a moved centerline version, ideal for large displacement motors.
Mopar Performance is the original supplier of aftermarket go-fast goodies for your Chrysler product. They offer a wide selection of cast iron and aluminum big-block heads, such as the CNC ported Stage VI head shown here, available in standard and Max Wedge port size.
Mopar Performance
Mopar Performance has long been supplying enthusiasts with parts and accessories to make their cars look and perform better than new. Their cylinder head selection is varied and incorporates everything from stock replacement heads to full blown, CNC ported race units. If you're looking for a factory replacement head or a legal stock class cylinder head, Mopar Performance can supply the part. Most of their cylinder heads require no modifications and utilize stock-style rocker arms and valve gear. Their Stage VI units are available in five states of finish from bare casting to fully CNC machined, and make good power on a street, strip, or full-blown race engine.
PN P4876311
This cylinder head is an aluminum replacement unit for factory big-block heads. It incorporates 2.14-inch intake and 1.81-inch exhaust valves and is a closed chamber design. These heads weigh in at 25 pounds each, which is about half the weight of an iron head, and utilize all stock-style rockers, intakes, and exhaust manifolds or headers. Unlike Stage VI units, these heads do not require the use of intake manifold adapters.
This Max Wedge replacement head is an excellent choice for the nostalgia, stock, or super stock racer. It is a closed chamber design and is available in two valve size configurations.
PN P5007494/PN P5249824
These cast iron heads were designed to be replacements for '62-'64 Max Wedge units. They feature a large port on the intake side for improved flow and an improved short side radius on the exhaust side. The combustion chamber is a closed style, and unlike the early Max Wedge units, these heads utilize six-bolt valve covers. Valve sizes are either 2.08-inch intake and 1.88-exhaust, or the more conventional 2.14-inch intake and 1.81-inch exhaust. These heads are a great choice for a nostalgia racer and are also legal for stock and super stock class racing.
PN P4529993
This Stage V cast iron cylinder head offers a blend of performance and streetability. It is an open chamber design similar to 906 castings, but outflows the 906 on both the intake and exhaust side. It's 96cc chamber is pump-gas friendly, and the head is available with the same two valve size configurations as the above Max Wedge replacement heads. Standard exhaust and intake patterns are used along with standard valve gear and valve covers. Intake rocker arms with a special offset must be used with these heads.
We've used aluminum Stage VI heads on bracket engines with some success, but have found them to perform better with port and bowl work. This bare casting shows a lot of casting flashing that needed to be cleaned up before the head could be installed. Also notice the deep spring pockets unique to the Stage VI casting. These pockets cause the top of the guide to be submerged in oil, necessitating valve seals be used even on race applications.
Stage VI Heads
With no less than seven versions of the Stage VI aluminum head displayed in their catalog, Mopar Performance shows they are dedicated to providing engine builders with a head that will meet their needs. These heads are available in bare form, allowing the engine builder to custom port the heads, or in several states of machining all the way up to fully CNC ported units. Port size as cast is either standard or Max Wedge size. The Stage VI heads will work on a healthy street motor, but really come into their own when utilized on high-compression, large ci race engines. They are a 78cc closed chamber design that incorporates 2.18-inch intake and 1.81-inch exhaust valves. The spark plug location is canted toward the exhaust valve to promote efficient combustion. Using these heads does come at a price, however, as offset rockers must be purchased to make them work. Certain Stage VI heads are designed to use an RB intake on a B block. Using a B intake on a B block or an RB intake on an RB block will require intake manifold spacers.
Stage VI heads in bare form require a significant amount of work before they can be bolted on. We spent numerous hours on this set, grinding away casting flashing and fine-tuning the ports to optimize power. Notice the efficient heart-shaped, quench-style combustion chamber and the relocated spark plug, which promotes efficient combustion.
As you can see, no matter what the application, there is either a factory or aftermarket cylinder head that will meet the needs of your big-block Mopar. We hope our cylinder head guide is useful and directs you to the right choice given your horsepower needs and budget constraints. Now is a great time to be building a Chrysler wedge engine. During the past 20 years, the aftermarket has gone from nonexistent to overflowing with support for the big-block Chrysler.
If you're planning to run Stage VI heads on an RB block, or on a B block with a B intake manifold, be prepared to also purchase a set of these required intake manifold spacers. They are available from Mopar Performance (PN P5249189).
This year's engine challenge features the RB wedge engine, and we're eager to see what cylinder heads our contestants will use on their entries. Follow along, as we're sure the power numbers will be impressive!