Im going to have my engine out shortly to put some better rods and pistons in,......my question is which cam to keep. I originally had a cc305 220/230 on a 114 for my setup, but got tired of waiting to add the boost, so I bought a cc306 and figured I would spray it. Later I added the s/c and still sprayed it. Now im putting forged rods and pistons in, and im wondering, which cam to put back? I was seeing 6 psi (pullied to the max) with the ported heads/cc306 combo. I still plan on spraying it as well, was a 150 shot b4, might add more? At this amount of boost and spray, do you think I would benefit by putting the cc305 cam back in vs. the cc306 on a 112? Im guessing the cc305 will net more power in boost? Thoughts and recommendations?

Oh, the pistons are 2618 KB forged with 18cc dish so that should bring my compression down to a more friendly ~9.4:1 with the 54cc chambers, stock crank. This is NOT a daily driver by any means. Its merely a toy that sees alot of abuse.

 

nobody has any input on this? shocking........

 

With the smaller amount of overlap in the smaller cam you should be able to get a tad more boost. But if you are spinning up the motor the larger cam will help you in the high rpm range.

Overall I'm guessing the cam won't make too much of a difference. Which cam has lift better matched for your head?

 

im leaning more towards keeping the cc306. the intake lift is the same but has 10* more duration while the exh. lift is about .030 higher and 14* more duration. my thoughts are that the intake duration and diff. in LSA wont hurt that much and the increased exh. duration will help in expelling all the waste from 6psi boost and 175 shot of nitrous, especially if I add a 2nd stage. Heads flow about 260/190 @ .600.

comments?

 

Well, after much thought and sleepless nights about which cam to put back in with my new setup, which should get me about 10+psi, my old engine that I pulled with the burnt piston seems to have made the choice for me. I built my shortblock and finally got around to swapping over my heads and accessories to get at the cam. Pulled it out and went to clean it up only to find a nice gouge in the #1 intake lobe. So,.....I dont feel like spending another $300 and waiting for a cam when I have a cam that will work. Hopefully the 220* of intake duration won't hurt that much. Had I known I wouldnt have been able to use the 306 cam I would have bought something more matched to my setup, but now I just want to continue moving forward, ive waited too long already. The engine is back in the car, just need to shim my new pulley, install the meth kit (no intercooler), and flash the trial tune. Im hoping for around 550 rwhp on boost alone, but im going to guesstimate 525. Anbody wanna take a stab? Not sure if im going to use the juice on it this time since its still a stock crank.

 

Have you even figured the degrees or valve overlap each cam has?

 

haven't looked to be honest, its a 07-306-8 specs:
IO 37 BTDC IC 73 ABDC
EO 90 BBDC EC 37 ATDC

07-305-8:
IO 38 BTDC IC 68 ABDC
EO 83 BBDC EC 27 ATDC

I tried to do the math but for some reason just confused myself. If I had a wheel in front of me I could figure it out. Could someone please do the math for me.

 

306 is 13 degrees.

305 is 1 degree with a 112 LSA.

 

why dont you put in a custom and sell the other 2?

 

sorry, i should have known better,......there's two versions of the 305, ive got the 114 lsa