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Kingsport, TN 37660

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SBC Chevy Comp Cams 660/630 RETRO SOLID Roller Cam # 12-920-9

Available

$389.00



Product Information

UPC352970494749
Product TypeShipped Product
Shipping Cost $12.50
Number of reviews 0
SBC Comp Cam RETRO STYLE SOLID ROLLER, 660/630 Lift, 260/284 Duration AT .50, 108 Lobe Sep.

This cam has a flat nose for use in early and some later style non roller blocks.

Reduced base circle cam. (.900)

See dyno results below.

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

PART NUMBER: 12-920-9

660/630 lift

260/264 duration

108 lobe sep.

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.

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.

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

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

Special Grind #

PART NUMBER:

660/630 gross lift

260/230 @50 duration

108 lobe sep.

This cam will make its peak power right at 6600 rpm. The idle is very radical. Power comes in around 3000 rpm.

We recommend a stall converter of around 3000 or up to 3500, preferably closer to the high side of this range. Final gearing would need to be at 355 or higher if used in a car weighing more than 3400 lbs. A 373 final gear is most optimal with this cam, providing the car is reasonably light. This cam does make the most horse power but will trade off bottom end throttle response and low speed cruising in the low rpm range.

This cam puts your setup into the Super-Pro-Street/Drag league.

Official Dyno reports on our 434 Super Pro Street engine.

Below are our dyno results on one of our 434 Super Pro Street engines. The horse power numbers will always improve anywhere from 5-10 more than what the dyno results show after the rings have fully seated. We made 698.8hp on this engine, (rounded to 700hp).

New Dyno Reports


 photo 434 holley 950 dyno.jpg

 photo 434 holley 950 graph.jpg


 photo 434 q1050 dyno.jpg

 photo 434 q1050 graph.jpg


 photo 434 pro 1050 dyno.jpg


 photo 434 pro 1050 graph.jpg



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.

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

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