I am probably one of the only people that have had both the 305 and 306 in the same car with the exact setup within a month of each other. Therefore, I can conclude that the 305 is a much better cam than the 306 when dealing with stock heads. Although i didn't have gears with the 306, which i am sure would have helped a bit, the 305 has a MUCH bigger power band and feels just as fast up top. And i am even running my 305 on the 306 tuning. I can actually shift at 6k and still be right in my power band. The car now makes massive torque, will pass emissions, much better gas milage, and is just as fast up top. For all you people wanting to put big cams in a car with stock heads DON'T.
Mike

 

Good points. But Marcin is now trapping at 115 with the CC306 and bolt-ons on completely untouched stock heads. His 4.10 gears really help with that cam and I'm sure they would have with you. I think if your set-up compliments the 306 nicely, than it will do good with stock heads. But for most, the 305 is a more practical and wise choice when combined with stock heads for a daily-driver. Like you mentioned, there is a lot more to a cam than peak power(the area under the curve is probably much better with the 305 around town). And the drivability improves too.

Mike

2002 M6 Z28

 

glad u like it krein..maybe it was the stock gears tha made u feel that u were out of the power band .

It feels to me like i am in powerband at all times with my setup, car drives awsome, little cam surge, and i still get 220 to the tank around city..and thats no easy driving either

Now time to go to the track and see what the bad boy runs

Marcin

 

I need to get my 230/236 110 LSA tuned badly, I am getting about 13 mpg on the highway, haha. It is surging mildy, but nothing terrible. PCMforless pretty soon, that should help out majorly...But I agree, the CC305 is great for stock heads, with my A4, stock gears, and stock stall with a 2.1 60 ft, I clicked off a 12.9 @ 106!

 

My next buildup will have a CC305 like cam, CC306 is a little too big. If I wanted to, I could spin it clear to 7000 rpm, and probably still make power. I'm only shifting 6400, because the I wouldn't want to spin the stock LT1 bottom end past 6300-6500.

I just gotta wait to get my new 28x11.5x15 Hoosier QTP's, and then head to the track to see what times and auto, stock head, CC306 car can turn out.

 

I've never experienced the 306 so I have no frame of reference. I run the 305 with ported heads and bigger valves and like it fine. I suppose that I could make some more power with the 306 and a good tune, but hell, I can't get traction now. I don't know where I'd put the extra power - except maybe up in tire smoke

 

I've said it before, if your drivin full throttle 90% of the time the cc306 is perfect for you, but since most of us don't(damn gas prices) the cc305 is better. Anyway, I was wondering, what kind of numbers are you pulling on your ported heads. I'm wondering how much more power the 306 will make over 305. I know people usually hover around 400 rwhp with good heads, I cam't imagine the 305 being way far below those numbers

 

how would the lt4 hot cam compare?

 

Numbers are in sig. My heads are stock castings done locally.

 

About the same size as the CC305.

LT4 Hotcam is 218/228 112 lobe, 495/495 lift with 1.5 RR's, 525/525 with the !.6 RR's it comes with.

CC305 is 220/230, 114 lobe, 510/510 with 1.5 RR's, 540/540 with 1.6RR's.

CC306 is 230/244, 112 lobe, 510/540 with 1.5 RR's, 540/570 with 1.6 RR's.

 

What if someone ran a cc306 with 1.6RR's on the intake and 1.5's on the exhaust. 540/540....Would that be cool or stupid for some reason?

 

it would push ur powerband down a bit
you really want a good exhuast since the LT1 heads exhuast sucks ***


on a side note
your *** is not a dyno

 

He he. I though the same thing. My butt-o-meter aint worth a $hit that's for sure.

 

Good post man, our car sound as good with the CC305? I'm getting a CC305 for my Trans Am, hopefully put it in this summer. I'm going to p.m you man, I need to ask some questions.

Neil

 

Thanks to the people that responded to MY post. If you others could use the PM option it would be appreciated.