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BBC Chevy Comp Cams 547/547 Xtreme Marine Retro Hydraulic Roller Cam 11-451-8



Product Information

Product TypeShipped Product
Shipping Cost $20
Number of reviews 0
BBC Chevy Comp Retro Style (flat nose) Hydraulic Roller Cam.
547/547 Lift 230/236 Duration 112 Lobe Sep. 
Xtreme Marine or Street Rod Camshaft 11-451-8
This cam has a flat nose for use in early or late model roller blocks and non-roller blocks. We have this cam available in an oe step nose also in our other listings. The part number for it is 01-451-8


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 photo 384eb881-7875-44b7-975a-0b7027c8c150_1.jpg
Part number: 11-451-8
547/547 lift.

230/236 duration

112 lobe sep.

This cam is a popular choice for our street rod bbc engine builds.

Comp Cams 'Xtreme Marine & Auto' Step Nose Hydraulic Roller Camshafts.

Cam info:

Official Dyno report on our 505 engine with this cam choice, a single plane intake, Bravo heads, a Brawler 950 carburetor, and a MSD distributor.

 505 547/547 dyno photo 0255e4d1-6e07-4c10-921c-54f8ad8b7ec0.jpg
505 547/547 graph photo cc7ca8a8-0a92-4a6f-9a30-0b2c71bd7cd0.jpg 
Official Dyno report with this cam choice, Bravo heads, a dual plane intake, a Brawler 850 carb, and an HEI  distributor. This cam produces an immense amount of torque in the low rpm range. We highly recommend this cam for applications requiring very high amounts of torque in the low rpm range. 
CAM CHOICE THREE FOR THE 572 MOTOR 547/547 NEW photo 89adbf69-1dbc-49ce-8999-98007469908f.jpg 
  547/547 CAM CHOICE 3 FOR THE 572 photo dd29c68a-f872-41fb-a4eb-b9f5390bea96.jpg

Listed below are a few important solutions to preventing valve train issues while having maximum performance and longevity in your engine when running large lift cams.

The solution to running a hyd. roller cam of decent size in a bbc engine is an easy, low cost fix, thanks to the Howards Max Effort lifters and Comp lightweight springs. The cost is only slightly more than the regular Howards street tie bar lifters, and they are undoubtedly the most stable hyd. roller lifters on the market without going to all out racing hyd. lifters. The Max Efforts are also very quiet. Not sure what rpm range they can remain stable at, but we have pushed some of our bbc engines up to the 6500 rpm range in order to establish the fall off point of a particular build. Fall off on hp levels are gradual up to 400 rpm past the max hp rpm range when using these special lifters, and that's the way it should be. We now use these lifters with all three of our bbc cam choices. 

The next big cause for valve train instability when running a cam in the upper lift and duration range on a bbc engine would be having spring pressure that is too low. Regardless of what some may say would be the correct spring pressure, we know what it should be for safe operation and good performance. The numbers are slightly high, according to some uninformed authorities, but running too low of a spring pressure will assure valve float when running a cam of this size.

If you have weak springs or wrong pressure ranges in your setup, then you must correct this. We offer a proper set of Comp valve springs that work perfectly with this cam. They do not require unusually long valves. We’re very satisfied with the seat to nose ratio. These springs are also much lighter in weight than previous springs we have used, and that's a real plus when trying to stabilize the valve train on a bbc engine running at near or above 6000 rpm. 

As you may know, there are larger lift bbc hyd. roller cams on the market, and we have used them for those running Pro-Street setups. Those also require a different type of lifter and special springs than what is used when running our regular Comp Cams. Our experience is vast on how to properly setup your valve train, due to the fact we have dynoed so many bbc street rod engines.

Big block Chevy engines pose a problem when running healthy sized hyd. roller cams if the valve train is not setup properly. It is essential that you address this before you start your build. 

We also offer this cam in a step nose oe roller style for use with later model blocks or blocks with a provision for a cam locking plate.

Please read the complete ad before purchasing this cam. If you're not sure if this cam is correct for your application, feel free to contact us for technical support.


If you would like expert cam recommendations for your engine, contact us (through the "seller information" tab with the information listed below. We will tell you what cam is best suited for you. Running a cam that is too big in a given combination is not only pointless for making increased power, but creates a increased loss of drivability and unnecessary wear on the valve train. You must have sufficient cubic inch and/or compression ratio, coupled with correct size cylinder heads that will allow enough flow, to justify a particular size cam. Bottom-end and mid-range performance are always affected when you increase cam size, but it would be affected even more if a cam selection is over-sized to the point that no top-end power is gained. So choosing too large of a cam becomes a two-fold problem. Tuning also becomes more difficult with larger than needed cams. 

For a recommendation on the best cam for you, please contact us with us the following information: 


  • Vehicle model or weight.
  • Engine size, (cubic inch)
  • Approx. compression ratio.
  • Cylinder head runner size.
  • Single or dual plane intake, (if dual plane, what model)
  • Final gear ratio, and overall tire diameter if known.
  • Transmission model.
  • Converter stall range.
  • Your hp expectations, and how you will be using the vehicle (cruising, street, strip, show car, etc.)
  • If a lopey idle is highly desirable. The size engine you have determines this with a given cam choice. We can tell you exactly what a particular cam will sound like in an engine.
  • The brand and type/series of lifters you are running. Very important!


Should a problem occur, please contact us. If a return is necessary, please contact us for an RGA number and return authorization. The RGA number must be included on the return label. If an item is returned without an RGA number, it will not be processed.






If you checkout and start over, the auto calculator will not recognize the multiple purchases, and there will be no shipping discount. 


FedEx is our primary shipper. We are unable to ship to APO/FPO addresses. Help us ship your order promptly by including your physical address at checkout. If your order MUST be shipped to a PO BOX, please contact us by phone. Additional charges may apply. Below is a map representing the estimated delivery time to get to you from our location.


FedEx Home Delivery delivers Tuesday - Saturday. If a package leaves here on a Thursday, and you are in a 2 day delivery zone, your package will deliver to you on Saturday. If you are in a 3 day zone, and your package leaves on a Thursday, you will not receive it until Tuesday. Expedited shipping is available upon request for an additional fee. Please contact us for rates.  

Hawaii and Alaska have a 6+ day estimated delivery time.

The shipping quoted in this ad is only for the 48 continental United States. If shipping to anywhere else, please give us a call or email us for quotes. The half price shipping on all additional items also only applies to items that are being shipped in the 48 continental United States

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