cc503 vs cc306…
Joined: Oct 2005
Posts: 1,419
Likes: 1
From: Holland Twp/Milford, New Jersey
I have no personal input but I did find this information on another board:
Originally Posted by FastTa
The CC306 cam is ground on technology that is over 20 years old. The CC306 is effectively all bark and no bite. There are much, much better cams available for LT1's that will provide much more power, much better idle characteristics, and better overall driveability.
The CC306 is listed as 230/244 @ .050", .510"/.540", 112 LSA. With that much spit in the duration and that little of lift, the CC306 is a very choppy cam that is very soft down low. The nose radius and flank rates of this cam are also off in relation to the LSA and lift. In addition with a 244 exhaust valve duration and .540" of exhaust valve lift on a 112 LSA, you are going to have a significant overlap without the effective intake or exhaust lift to support it or the intake duration to support it.
But lets look at this in even more deatail.
There are a few ways to calculate degrees of overlap. I will use the advertised duration and lobe separation angle method since I do not know offhand the specific IVO or the EVC timing of the CC306 camshaft.
First you add the advertised intake and exhaust duration together. Then you divide that sum by 4. Then subtract the LSA. Then multiply that by 2.
290+307 = 597
597/4 = 149.25
149.25-112 = 37.25
37.25 * 2 = 74.5
So the total valve overlap is approximately 74.5°. Like mentioned above, the profile of this cam cannot effectively support the overlap. Thus you end up with a rough cam that doesn't make really good power for what it is.
If you want to stay around this size cam, there is a popular grind R&D'ed by Combination Moptorsports, the TN-230XL. It is listed as 230/236 @ .050", .544"/.555", 112 LSA. This cam will make better power, idle better, and drive better.
The CC306 is listed as 230/244 @ .050", .510"/.540", 112 LSA. With that much spit in the duration and that little of lift, the CC306 is a very choppy cam that is very soft down low. The nose radius and flank rates of this cam are also off in relation to the LSA and lift. In addition with a 244 exhaust valve duration and .540" of exhaust valve lift on a 112 LSA, you are going to have a significant overlap without the effective intake or exhaust lift to support it or the intake duration to support it.
But lets look at this in even more deatail.
There are a few ways to calculate degrees of overlap. I will use the advertised duration and lobe separation angle method since I do not know offhand the specific IVO or the EVC timing of the CC306 camshaft.
First you add the advertised intake and exhaust duration together. Then you divide that sum by 4. Then subtract the LSA. Then multiply that by 2.
290+307 = 597
597/4 = 149.25
149.25-112 = 37.25
37.25 * 2 = 74.5
So the total valve overlap is approximately 74.5°. Like mentioned above, the profile of this cam cannot effectively support the overlap. Thus you end up with a rough cam that doesn't make really good power for what it is.
If you want to stay around this size cam, there is a popular grind R&D'ed by Combination Moptorsports, the TN-230XL. It is listed as 230/236 @ .050", .544"/.555", 112 LSA. This cam will make better power, idle better, and drive better.
