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BCR Products has been supplying the highest quality parts to racers for almost ten years. From custom made throttle controllers to the best accessories from Biondo Racing Products, many National, divisional and track championships have been won. Remember all our products are designed by racers for racers. We are now producing a new line of big block Mopar billet aluminium main caps.

BCR CNC MACHINED MAIN CAPS - MOPAR
For the serious BB Mopar engine builders out there, BCR products billet machined main caps.

All BB Dodge motors have a serious problem in the main webbing and cap area if you use cast iron heads and or make 500 plus horsepower. The heads have a poorly designed quench area and no matter what you do to modify them they tend to pre-ignite or detonate the air fuel mixture. This in the long run tends to crack blocks and cranks then it eventually will break the main caps themselves. BCR have been building BB Mopars for nearly twenty years and kept running into this problem. What they found out was if they built a high HP Mopar with aluminium rods it always lived a longer life than a steel rod motor. What they found is the rod acted as sort of a dead blow hammer and took up the shock of the detonation and or in the case of aluminium head motors the combustion shock and did not transfer it to the mains as badly.

Most people especially street strip guys do not want to run an aluminium rod due to the duty cycle being so short on them. They found if you use an aluminium main cap that it does the same thing and you can then run the steel rods and extend the life and the output ability of all BB Mopars. Since using aluminium caps the percentage of failure of any of the above mentioned components went down by at least 80%. As a side note they are using the same caps on their Super Gas motor now for the past 11 seasons with no re line bore. The other advantage is they almost eliminate what is called cap walking. The movement of the caps that can be seen on the bottom of the caps when removed that looks like a rough surface transferred to the caps.

Along with input from many top engine builders from around North America and of all places Sweden they redesigned their original caps to create what they and many others feel is the ultimate main cap. There are others who build main caps, but beware of the inherent design flaws. Problem with their caps is they were made out of plate aluminium and they didn't fit very well and were poorly machined. BCR caps are billet 6061 T6 and are fully CNC machined on all surfaces. They also had recessed holes for the main studs and you had to use a special ARP stud kit with a twelve point head. So if you had a Miloden stud kit with six point heads you had to go and buy another set because you could not get a socket down in the holes to torque them. Then you had to modify the rear main seal plate to fit the # 5 cap. BCR addressed all these issues and they feel have came up with a better system. These are especially suited for those who are now using the new Edelbrock aluminium heads as it is easy now to make large Horsepower figures using them. If you are going to make some big numbers with your stock block you will need these to ensure a long life out of the stock components. These caps have now been successfully run in motors making in excess of 700 HP. These will fit all 383, 400, 413 and 440 stock blocks with two bolt mains. These require line boring of block when installing.
 

Get the benefit of aluminium rods without the drawback of very short duty cycles

click on an image for a larger view

USA Imports Price:     5 caps 292.00 plus postage and packing

Prices for parts NOT listed as IN STOCK are subject to change and will be confirmed at the time of placing order.

Delivery of items IN STOCK is 1 to 4 days depending on weight, delivery of items not in stock will be confirmed at time of placing order.

To enquire about or purchase any of the above parts please go to the order form/spec sheet on the FBO Products page and fill in any relevant information or email/telephone us with your specific requirements.

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