Skip White Performance - We have the best prices you will ever find for aluminum heads, rotating assemblies and strokers
Skip White Performance
3349 E. Stone Dr.
Kingsport, TN 37660

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 423-722-5152

SBC Chevy 383 406 Comp Cams 520/540 LIFT OE Hyd. Roller Cam # 08-000-8-11323

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Product Information

UPC353980270929
Product TypeShipped Product
Shipping Cost $20
Number of reviews 0
     SBC Comp Cam OE HYD. ROLLER 520/540 Lift 236/242 Duration 

110 Lobe Sep. 
This cam has a step nose for use in oe roller blocks.
Reduced base circle cam. (1.050)
 
See dyno results below.

*** IMPORTANT NOTE ***

You may add items into your shopping cart but in order to check out you will have to call us. Our check out feature on our website is being upgraded at this time. We can take your order over the phone and answer any technical questions you may have. We accept all major credit cards, cash, check, and money orders. Just give us a call at 423-722-5152 and we can process your order promptly. In the event you attempt to reach us outside of our operating hours, please leave us a detailed message and we will return your call at our earliest opportunity.

 photo 384eb881-7875-44b7-975a-0b7027c8c150_1.jpg
 

Comp Cams has notified us of a back order on cam cores that will be in effect till approx. Sep. 7. Were very sorry for the delay. 

 

Special Grind # 33161
 
PART NUMBER: 08-000-8-11323
 
520/540 lift

236/242 duration

110 lobe sep.

Comp Cams SBC Xtreme Energy Step Nose Hydraulic Roller Camshafts. 

These special cams are made from an Austempered Ductile Iron Core, (a super hardened cast core), and have a reduced base circle (1.050). This allows the use of most rods on the market without having to grind any material from them when used in engines with a 3.750 stroke crank, such as those in the 383 and 406 sbc engines, and this includes the Scat H-beam rods, as they usually have the worst cam to rod interference. The 421 stroke cranks, (3.875) required very little grinding and, depending on the rod type, you may not have to grind them at all. This not only preserves the integrity of the rod, but most importantly, the rod bolt. By not having to grind the rods, you will also maintain the balance of the rotating assembly, should it have been already balanced before the rods were cam clearanced. We now use these reduced base circle cams in every sbc engine we build. These special cams can be used with a regular distributor gear. No need to run a bronze gear. Pushrod length will usually be approx. .050 longer than what a full base circle cam uses due to the reduced base of this cam. 

Take a look at what has to be done to the rod body and bolt section of this rod in the picture below when using a full base circle cam in a 3.750 stroke (383 or 406) engine. The idea of having to go this far into the bolt is unsettling, to say the least. The reduced base circle cam eliminates having to do this. As mentioned above, this is one of the many reasons we now use the reduced base cams in all our sbc engines.

 photo 3c6a18d7-2844-4883-bb0c-588ea5dabf25.jpg

Important note from our company president, Skip White.

Our new line of Comp custom ground street rod cams has improved our horse power and torque numbers better than anything we have done to our lineup of street rod engines. The profiles on these cams are unique. We have increased the hp numbers approx. 20-30 with no increase in lift and duration or lobe sep. as compared to our former line of cams. As time goes, we will be adding many dyno reports with various combinations of intakes and rocker ratios, and showing this cam used in engine sizes from 383 cubic inch all the way up to our 434 pump gas street rod engines. These ads will show you many characteristics of the cam and how it will perform and our recommendations on what to expect as far as street manners are concerned. 

We are often asked the rpm operating range of a given cam as stated on the cam card. This info is useless, in our opinion. These rpm ranges can be very misleading. It would be fair to say that 99.9% of people misinterpret these numbers. If we asked 20 different people just what does "operating range" mean, they would all most likely come up with a different explanation. Most people are also not aware that the size of your engine will drastically change the operating range numbers, and if you do understand that, then one must still wonder what operating range actually means. 

Many cam cards will also make mention of the cam's uses and characteristics, and we often find that info to be misleading also. The worst place to get cam recommendations is from a friend that has an engine similar to yours. Your friend often has nothing to to compare it against, and therein lies the problem. The next worst place to get a cam recommendation is from the cam manufacturer's tech dept. We have many customers asking us to put a cam in an engine we're building them based on the recommendations from a cam company they have spoken to. We usually find the recommendations to be terribly wrong for the customer's application. 

Our experience on a cam's characteristics in a vehicle are based on years of feedback from our customers that have bought engines from us. This is real world experience. Our Superflo Dyno has also shown us exactly what a given cam will do in a given size engine. The compression ratio is also a very important factor in what a cam will do in an engine. For the most part, our line of engines are in the pump gas compression range.  

 The dyno results below are from various engine builds that have chosen this cam.

Carefully read the test description in each of the dyno reports below. This exact cam was chosen in many of our sbc street rod engine builds. These are all pump gas street rod engines with approx. 10.5:1 compression. Most of the 383 and the 421 engines are running our low cost NKB aluminum heads. Some of the other engine builds are running the AFR heads. Various intakes and rocker ratios were used. The hp numbers produced with our new line of custom ground Comp Cams well exceed most other cams on the market the have nearly identical lift, duration and lobe sep. numbers. 

You will see this list of dyno results grow in time as we will continue adding other combinations. We also offer several other special grind cams with fabulous profiles. We have a total of four different sbc Comp cams listed with dyno results. We also offer all of our cams in late model step nose or retro style flat nose for use in early style non-roller blocks. 

 

Official dyno results with this cam in several engine sizes.
 
Dyno results: 421 engine, NKB heads, 1.6 rockers, Quick Fuel 750 Brawler carb, single plane intake.
 
520/540 in 421 dyno photo 2cfb5aac-e282-4b70-9330-0218858db701.jpg 
 
520/540 in 421 graph photo dd613d61-4e15-4c26-a71c-2a955e46b2cd.jpg
 
Listed below is our 2.0 383 pump gas engine making 508 horse power at 5900 rpm. You would be hard pressed to find a cam of this lift and duration to produce these hp and torque numbers in a 383. We find this size cam to be the perfect all around size to give good drivability yet make outstanding performance numbers. Very little strain on the valve train components with a cam of this size. This engine had our low cost NKB heads on it, and the regular Speedmaster single plane intake.
 
383 520/540 lift photo eeb5fc54-3b18-48a9-b9e2-a279c0a3bdf9.jpg
 
 
383 520/540 lift graph photo 6134523b-b048-4c36-8b5a-9d196a237e8a.jpg
 
Dyno results: 406 engine, AFR heads, 1.6 rockers, Quick Fuel SS 850 carb, dual plane intake. Considering this engine had a dual plane intake the 406 engine made excellent hp and torque numbers. The AFR heads with this cam worked out very well in this engine build. 
 
 
The 421 listed below made 526 horse power with this cam and had a set of our low cost 200cc NKB heads on it with the 1.5 rockers. Very impressive considering the low cost heads, and size of this cam. Notice the torque numbers in produced. A fairly flat line from 4100 up to 5500 rpm.
 
421 520/540 lift 526/526 results photo 2e276f62-e066-4935-946c-f28b3c4ec2b3.jpg
 
421 520/540 lift, 526/526 results graph photo fdd4c03d-8cd6-49e8-b7d3-656dbb407441.jpg
 
Nearly 600 horse power in our 427 sbc engine on a cam with 520/540 lift and duration at 236/242 is amazing. This engine has 10.5:1 comp. ratio. The new custom ground Comp cams are amazing to say the least.
 
427 comp 8-433-8 cam photo 2435b926-d17a-498c-82fa-4d80004c7c22.jpg
 
427 comp 8-433-8 graph photo e1e426c1-a358-4994-83c3-c48ae188b11c.jpg
 
The engine below would be considered an all out torque monster. HP numbers are not that high but the torque numbers down low are very impressive. This engine had the small AFR heads on it, and 1.5 rockers. Off the line acceleration on this engine would be incredible when run in a 434 cid engine.
 
434 520/540 dyno photo 9821e971-c2c8-46f1-9f6e-b278768061ff.jpg
 
434 520/540 graph photo 7bebddbe-c45d-47ed-9fd6-0529b69b3a48.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 an engine and avoiding valve float is an easy fix, thanks to the Howards Max Effort lifters and our 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 hydraulic roller lifters. The Max Efforts are also very quiet. Not sure what rpm range they can remain stable at, but we have pushed many of our sbc engines up to the 6,650 rpm range in order to establish the fall off point of a particular build. We now use these lifters with many of our cam choices. We have tried the Morel tie bar hyd. roller lifters on cams in the 550 and higher lift range in the past and found them highly unstable at around 5800 rpm. Well before audible valve float was evident, the horse power numbers were falling sharply due to valve float. Any cam that's approaching the 550 lift or higher range should not use the Morel street/strip lifters. The Max Efforts were very stable well into the 6500 rpm range and higher. The cam in this add is below the 550 lift range but close enough to the limit that we recommend the Max Effort lifters. 

The next big cause for valve train instability when running a cam in the upper lift and duration in an 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 before peak power is made.

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 an engine running at near or above 6000 rpm. Our experience is vast on how to properly setup your valve train, due to the fact we have dynoed so many street rod engines.

Please read the complete ad before purchasing this cam. 

 

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!

Very Important Note!

 

Our sales staff has limited technical knowledge on this product and are usually unable to answer many of the questions asked. See our other listings for variations of this product.

 

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      We are not responsible for collateral damage caused by the use of this product.

       

RETURN POLICY

 

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. A full description of what the problem is needs to be included with any returned product with your contact info, and proof of purchase. Even though you may have explained the problem to us, and been granted permission to return the product, we must have a written explanation and a contact number included with the product. It is also recommended that you include the name of the person from our company that you have been in contact with. You must send the item back to us in a trackable manner (USPS Priority Mail, FedEx, etc.) and keep the tracking info of the returned product. Please give ample time for returns to be processed. Following these guidelines will make the return process work as it should.  

 

PAYMENT AND SHIPPING DETAILS.

 

We offer great discounts on shipping. You only pay the full shipping fee on the highest shipping cost of your items, and HALF PRICE shipping on all additional items. Few offer discounts on shipping such as this. Our checkout system will automatically calculate your shipping discount at the time of final payment, providing you consolidate your payment.

 

You may receive a verification and tracking number shortly after purchase, but this does not necessarily mean that your product has shipped. It would be fair to say that 98% of products will be going out the day the shipping label is issued. On occasion, the product may not ship out until the next day after the label has been issued. Most products purchased late in the day will not be shipped until the next day.  

 

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. Additional charges may apply. Below is a map representing the estimated delivery time to get to you from our location.

 

Delivery times may vary, especially during peak periods.

MAP

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 may deliver to you on Saturday. If you are in a 3 day zone, and your package leaves on a Thursday, you should receive it on the following Tuesday. Expedited shipping is available upon request for an additional fee. Please contact us for rates. The estimated shipping time is usually as the map shows, but many factors can delay this.  

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 contact us. 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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