cc503 vs cc306…
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From: Bahrain
cc503 vs cc306… ...in a 355ci (A4) with stock heads and upgraded valve train, 3500 stall , Ported intake manifold, CAI+52mmTB, LTs+ORY, Cat-Back, EWP, 3.73 gears, IGN, 36#injectors+FPI, PCM mail tune, and some free mods
Which one is a better choice in terms of:
- More HP/Torque
- Better E/T and speed
- Drivability
- Loopier idle
Please, I need opinion/advice from those who tried and have a first-hand experience with any of these cams, I ve already read the (*Stock Head Cam/Cam Swap Guide*) sticky thread but still need to know more,,,ur input would be appreciated . thx
Which one is a better choice in terms of:
- More HP/Torque
- Better E/T and speed
- Drivability
- Loopier idle
Please, I need opinion/advice from those who tried and have a first-hand experience with any of these cams, I ve already read the (*Stock Head Cam/Cam Swap Guide*) sticky thread but still need to know more,,,ur input would be appreciated . thx
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From: Spokane, WA
The 503 is about as big as you would ever want to go on stock heads, so my vote goes for that. Here's some more specific answers though.
- More HP/Torque
Depends where you want it. The 503 is overall the best choice on stock heads because the 306s power curve is simply too high so it gets choked by stock heads. Its not a bad cam, but I honestly wouldn't pick it even with ported or aftermarket heads simply because there are cams that provide the same or more benefit while maintaining a nicer power curve. Put simply: the 306 needs to be revved to the moon, the 503 doesn't.
- Better E/T and speed
I'm sure others can better answer this because I am simply going off of a guess, but my vote goes to the 503 because it has more power under the curve.
- Drivability
Both should be drivable, the 503 is probably a bit more civilized.
- Loopier idle
The one category where the 306 comes out on top. I'll admit it SOUNDS badass
- More HP/Torque
Depends where you want it. The 503 is overall the best choice on stock heads because the 306s power curve is simply too high so it gets choked by stock heads. Its not a bad cam, but I honestly wouldn't pick it even with ported or aftermarket heads simply because there are cams that provide the same or more benefit while maintaining a nicer power curve. Put simply: the 306 needs to be revved to the moon, the 503 doesn't.
- Better E/T and speed
I'm sure others can better answer this because I am simply going off of a guess, but my vote goes to the 503 because it has more power under the curve.
- Drivability
Both should be drivable, the 503 is probably a bit more civilized.
- Loopier idle
The one category where the 306 comes out on top. I'll admit it SOUNDS badass
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Joined: Jul 2007
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From: Spokane, WA
No problem, man. Hopefully some guys that have more experience with the 2 can chime in, but that's my understanding of them. The 503 will usually make about 350-370 RWHP with supporting mods depending on if the car is auto or manual and of course all the other little variables.
ehhh.. 503 will probably make closer to the 350 range than 370. My buddy had a cc306 in a STOCK motor (even stock stamped rockers - i know, stupid) with stock heads, etc on 220k miles. The car was a 6spd, and I will admit, it hauled *** for having untouched factory heads and just simple bolt ons (headers and exhaust, not even intake). I don't see anything wrong with a cc306 on a stock motor, just make sure you get good valvesprings.
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- More HP/Torque
Depends where you want it. The 503 is overall the best choice on stock heads because the 306s power curve is simply too high so it gets choked by stock heads. Its not a bad cam, but I honestly wouldn't pick it even with ported or aftermarket heads simply because there are cams that provide the same or more benefit while maintaining a nicer power curve. Put simply: the 306 needs to be revved to the moon, the 503 doesn't.
Depends where you want it. The 503 is overall the best choice on stock heads because the 306s power curve is simply too high so it gets choked by stock heads. Its not a bad cam, but I honestly wouldn't pick it even with ported or aftermarket heads simply because there are cams that provide the same or more benefit while maintaining a nicer power curve. Put simply: the 306 needs to be revved to the moon, the 503 doesn't.
If I was back in time doing my first cam swap and was choosing between the 2 i'd go with the 306 all the way, no doubt in my mind.
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Ive got a 97 w/92,000 mi. My car is an M6 and Im running the 306 on stock heads and bottom end. I do have all the supporting parts which includes 918 Beehives and 1.6/1.5 Comp Pro Mag Full Rollers split. I also have all major bolt ons which would include a Meizere EWP. As for exhaust I went with the Summit universal x-pipe with dumps BTA in 2 1/2 inch. I havent dynoed it since the exhaust swap but after adding the EWP and Moroso CAI I netted 338rwhp on a Mustang Dyno so If I had to guess I would say im around 370rwhp on a dynojet.
As for driveability the 306 is do-able IF the car is tuned for it. Untuned it wont run good. Trust me I know, lol Before mine was tuned right it stalled at EVERY LIGHT.
As for track times I cant help u there. suprising enough my car has yet to see the track since Ive owned it so I have no times for ya. I hope to have it at the track in the next few weeks though.
Hope this helps ya MANG.
sean
As for driveability the 306 is do-able IF the car is tuned for it. Untuned it wont run good. Trust me I know, lol Before mine was tuned right it stalled at EVERY LIGHT.
As for track times I cant help u there. suprising enough my car has yet to see the track since Ive owned it so I have no times for ya. I hope to have it at the track in the next few weeks though.
Hope this helps ya MANG.
sean
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Ive got a 97 w/92,000 mi. My car is an M6 and Im running the 306 on stock heads and bottom end. I do have all the supporting parts which includes 918 Beehives and 1.6/1.5 Comp Pro Mag Full Rollers split. I also have all major bolt ons which would include a Meizere EWP. As for exhaust I went with the Summit universal x-pipe with dumps BTA in 2 1/2 inch. I havent dynoed it since the exhaust swap but after adding the EWP and Moroso CAI I netted 338rwhp on a Mustang Dyno so If I had to guess I would say im around 370rwhp on a dynojet.
As for driveability the 306 is do-able IF the car is tuned for it. Untuned it wont run good. Trust me I know, lol Before mine was tuned right it stalled at EVERY LIGHT.
As for track times I cant help u there. suprising enough my car has yet to see the track since Ive owned it so I have no times for ya. I hope to have it at the track in the next few weeks though.
Hope this helps ya MANG.
sean
As for driveability the 306 is do-able IF the car is tuned for it. Untuned it wont run good. Trust me I know, lol Before mine was tuned right it stalled at EVERY LIGHT.
As for track times I cant help u there. suprising enough my car has yet to see the track since Ive owned it so I have no times for ya. I hope to have it at the track in the next few weeks though.
Hope this helps ya MANG.
sean
A full bolt-on LT1 with a cc306 and an M6 will rape lots of cars from a roll. It won't even be a contest if he hits it with a 125 shot. It's probably one of the best combos out there.
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From: Bahrain
joelster: good post man, i guess i have the right stall but not the rear gears 
i was told that the 3.73 is not the best choice for a A4 and that it depends on the size of rear tyers im having.
seanaugustus: how did u get it tuned, mail or dyno ? and what do u advice ?
i was told that the 3.73 is not the best choice for a A4 and that it depends on the size of rear tyers im having. seanaugustus: how did u get it tuned, mail or dyno ? and what do u advice ?
Im going to help u out even more bud, Here is my set up to a T.
Comp Cam 306
Comp 918 Beehive Springs
Comp Pro Mag 1.6/1.5 split (Kinda wish I would have went 1.6's all the way across the board)
Lunati Lifters (Stay AWAY from Comp R's their JUNK)
GM Extreme Duty Timing chain and Gears.
Exhaust already mentioned but to include Pacesetter LT's
Meizere EWP
Moroso Intake and Aftermarket Elbow
MSD wires with Accel opti and coil
BBK 52mm TB
Car was Dyno Tuned
And a bunch of free mods and weight loss.
Remember though its not all about POWA U NEED TO SUPPORT POWA WITH SUSPENSION MODS. All powa on stock suspension equals NO TRACTION lower ET'S.
First suspension mods I recommend are Subframe Connectors being the first then do LCA's and Adj. Torque.
If I had to make a guess on my 1/4 time id say a modest 12.5 or better. I HOPE ANYWAY.
GL, Now go to work an make her FAST! LETS GO RACIN!!
Last edited by seanaugustus; Feb 7, 2009 at 08:54 AM.
This is the only way for U. I have Motive 3.73's in my 10 bolt with Zexel Torsen LS. I would have done 4.10's but on a 10 bolt is very scarey. KABOOM!! 
I'd recommend an OEM lifter personally, aftermarket lifters can be pricey and can be problematic, new stockers or low mileage ones will work just fine
my cc503 car made 325rwhp through a unlocked stalled auto, midlength headers, tr6 plugs, and 130k+ mile motor
the cc503 and cc306 will dyno around the same given all variables equal with the cc306 maybe having a tad bit more peak power, both will perform around the same from what I've seen at the track. difference is though the cc503 will offer better driveability, gas mileage and require a less radical setup to optimize it
my cc503 car made 325rwhp through a unlocked stalled auto, midlength headers, tr6 plugs, and 130k+ mile motor
the cc503 and cc306 will dyno around the same given all variables equal with the cc306 maybe having a tad bit more peak power, both will perform around the same from what I've seen at the track. difference is though the cc503 will offer better driveability, gas mileage and require a less radical setup to optimize it
Based on your 4 categories the cc306 will be the better than the cc503 in 3 of them so thats probaly the right choice for you personally.
I ran the cc503 with a 3600 Stall and 3.73's and it was an animal. Probaly would be even nicer with the cc306 just keep the revs at a reasonable level. If your still stuck between there is always the XE 230/236 which is inbetween.
I ran the cc503 with a 3600 Stall and 3.73's and it was an animal. Probaly would be even nicer with the cc306 just keep the revs at a reasonable level. If your still stuck between there is always the XE 230/236 which is inbetween.
Based on your 4 categories the cc306 will be the better than the cc503 in 3 of them so thats probaly the right choice for you personally.
I ran the cc503 with a 3600 Stall and 3.73's and it was an animal. Probaly would be even nicer with the cc306 just keep the revs at a reasonable level. If your still stuck between there is always the XE 230/236 which is inbetween.
I ran the cc503 with a 3600 Stall and 3.73's and it was an animal. Probaly would be even nicer with the cc306 just keep the revs at a reasonable level. If your still stuck between there is always the XE 230/236 which is inbetween.
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From: Bahrain
Based on your 4 categories the cc306 will be the better than the cc503 in 3 of them so thats probaly the right choice for you personally.
I ran the cc503 with a 3600 Stall and 3.73's and it was an animal. Probaly would be even nicer with the cc306 just keep the revs at a reasonable level. If your still stuck between there is always the XE 230/236 which is inbetween.
I ran the cc503 with a 3600 Stall and 3.73's and it was an animal. Probaly would be even nicer with the cc306 just keep the revs at a reasonable level. If your still stuck between there is always the XE 230/236 which is inbetween.
