BBC Chevy Comp Cams 575/575 Lift Xtreme Retro Style Hyd Roller Cam 11-461-8
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Comp Cams RETRO STYLE FLAT NOSE HYDRAULIC ROLLER
575/575 Lift 254/260 Duration 112 Lobe Sep.
Xtreme Marine Camshafts 11-461-8
This cam has a flat nose for use in early and some later style non roller blocks We have this cam available in a oe step nose style also. The part number is 01-461-8
Part number: 11-461-8
112 lobe sep.
This cam is our most popular choice for our street rod bbc engine builds.
Comp Cams 'Xtreme Marine & Auto' Step Nose Hydraulic Roller Camshafts.
This cam is one of our official cam choices in our line of bbc engines. It is the perfect size to offer the best balance of power while putting a relatively low amount of stress on the valve train. This profile is not only easy on the valve train, it makes a great amount of overall power on bbc street rods. This cam prevails as the perfect size for 454 and especially 496 bbc engines. It has a somewhat aggressive nature in the 454 sized engines, but becomes very manageable in the 496 builds. Without a doubt, this cam is the perfect size for the complete line of bbc street rod engines. Compression ratio in most of our engines is approx. 10.3:1 and is more than sufficient, especially in the 496 and larger engines.
This is an amazing cam in every respect. As you may know, there are many aspects to a cam’s profile besides lift, duration and lobe sep. and Comp Cams has produced an excellent cam that works very well in all bbc street rods. We’re going to list below our actual dyno results on every size of bbc engine we have dynoed with this cam. We have used it in at least 600 bbc engines, from a 454 up to our 632 in the past couple of years. Of the three Comp Cams we use, this is our most popular by far.
We offer two more amazing Comp Cam profiles that we’re very proud of. For those running the smaller bbc engines, we recommend our Comp 540 lift cam for improved low end response. If you’re building a 454/468 engine, this cam would be considered slightly aggressive, and would require compression ratio numbers in the mid 10's or higher to operate well. For those building a 496 or larger and want the very best mid to top end power available in a hydraulic roller without having to spend huge amounts of money to stabilize the valve train, then this cam choice is the perfect choice for you.
This cam will allow safe operation of the valve train. It's not going to give any problems in the long run if you’re running decent hardware and lifters. You should run a higher than normal grade lifter. Regular drop in roller lifters may not work properly with this cam. This increased lift and duration will bring the spring pressures up on the nose somewhat high, and that's desirable to maintain valve train stability, but regular lifters may have an issue with this increased pressure.
Below are our dyno results on some of our engines with this cam. Your results may vary depending on intake choice. The horse power numbers will always improve anywhere from 5-10 more than what the dyno results show after the rings have fully seated.
This cam has a step nose for use in oe roller blocks and non-roller blocks that have a provision for a cam retainer plate. We also have this same cam available in a retro style flat nose. The part number is 11-461-8
Official Dyno report on our 572 engine with this cam choice, AFR heads, and a single plane intake.
Official Dyno report on our 496/505 engine with this cam and a single plane intake.
674 hp with our new Bravo 335 heads is outstanding. This particular engine only had approx. 9.85:1 compression ratio. Normally we run right at 10.3:1 Our hp numbers would have been higher for certain had we had the compression ratio in the higher zone.
Official Dyno Results on this cam in our 555 engine with a single plane intake and new Bravo 335 rectangular port heads.
Official Dyno Results on this cam in our 555 engine with a dual plane intake and flat top pistons.
This is a low compression setup, (approx., 9.3:1) with our smaller 300cc oval port heads, and a dual plane intake. The hp and torque numbers are very impressive. This engine is what we consider a true torque monster, with this cam in it.
Official Dyno Results on this cam in our 555 engine with a single plane intake and AFR heads.
Official Dyno report on our 632 engine with this cam, AFR heads, and a single plane intake.
Official Dyno report on our 496 engine with this cam, Bravo heads, and a single plane intake.
681 hp with our new Bravo heads is outstanding.
Our regular Howards Tie Bar hyd. roller lifters were on the verge of valve float at peak power rpm on the smaller bbc engines. As you may know, the smaller cubic inch bbc engines will require a bit more rpm to make max power, and right at 6000 rpm, the regular street tie bar lifters were allowing light valve float to enter the picture. This is evident on the dyno, as the engine takes a sharp nose dive right about 5900-6000 rpm.
Truth is, prior to this rpm, the hp numbers were not climbing the way they should, and minor valve float was taking place earlier than 5900. Valve float to a minor degree can allow a valve to come loose from its locks. This could spell instant doom for your engine. It would be fair to say that most dropped valves in bbc engines happen when the rpm is taken past the valve train limits. Each time minor valve float comes in, it is weakening, or may we say, creating excessive wear on components that eventually lead to a dropped valve.
We have many allies against such problems, and without spending a great amount of money, including the lightweight PBM Competition valves, and Comp Cams light weight springs and retainers we use in all our bbc heads. We also use high quality lightweight roller rockers. Read below for more info on things you can do to prevent problems in the valve train when running cams in the upper lift range. If you think you can get by with a slightly smaller cam, we offer a cam that is identical in its overall design but has a slightly lower lift, 566/566, and a slight reduction in duration. It would be better suited for the 496 pump gas street rods in our opinion, and is less demanding on what type lifters you use.
The 575/575 cam in this ad would be considered max size you could run on a normal pump gas 496 build, providing you had at least 10.5:1 compression and a set of heads that were 320cc or more. There is a point that larger than needed cams will not produce more power but leave you with less street manners than the smaller cam.
We also offer a third cam choice in our lineup of bbc street rod cams. It has a lift range of 547/547 and even less duration. This is the most practical size cam for 454 and 496 engine builds that are put in heavier cars and sport trucks. This size cam offers the best street manners, and valve train stability is excellent. It's fair to say that 90% of our customers that choose a cam for their particular build end up with a cam that's larger than needed.
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 retro roller style for use with early model blocks.
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.
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