I'm curious what times guys have run with this cam and how streetable and tunable is it? Would it be a good upgrade from a cc305ish cam? I would like to go bigger but emissions is a concern.

 

If you already have a CC305 in the engine right now, then don't do the GM846, you won't see much, if any, gains from it. However, if you have the stock cam and are looking to upgrade, I would recommend the GM846 over the CC305. Moderate duration with good lift numbers for the GM846, would be a good match for stock heads IMO. I don't know how strict your emission-check is, but I think you will need a good tuner to pass emissions even with the GM846 since it is on a 112lsa. Good luck.

 

your gonna se a difference with the GM 847 over the 305.....


its gonna be a nice gain!!!!


the 305 is a wussy cam

 

846, not 847. I'd like to do the Hot Cam swap, but I'm afraid of losing reliability.

 

its the 847,,,,,,,,,,,,,,,,, not 846.... look it up

 

Perhaps you are not aware they are referring to the 846 cam and not the 847, since they are two separate cams.

PN**** DURATION LIFT (1.5)LIFT (1.6) LSA
12370846 222 230 .509 .528 .543 .563 *112
12370847 232 242 .539 .558 .575 .595 *112

 

oh



hahahah my bad!!!!!


yea looks like the same as the 305.... dont bother with the 846!!!


but i'd still say get the 847!!!


thanx for clearing that up shoebox

 

He said emissions is a concern. No way with the 847.

Shoebox, do you think that the 2 degrees of duration on the intake side will make it any easier to pass emissions with than the XE 224/230? The 224/230 should pass on a 114LSA, but it would be hard on a 112 according to many board members. Will this be just as hard to pass with on a 112 lsa as the 224/230 on a 112?

I hate the idea of having to go to a 114 LSA on a cam, but If I have to I will

Also, could you run 1.6's normally and then for emissions swap in some 1.5's? I know it would be a pain but if its possible to run a larger cam and just switch the rr's for emissions I think it would be worth it.

and to Dave:
how "cc305ish" is it?

 

I totally disagree with the theroy that the 112LSA cams will have a hard time passing emissions. While I don't have to deal with that here , I have heard of people passing with the 306 on the LTx motors and similar cams on the LSx motors. A tune is very important to passing emissions with these cams. Crane offers a cam that has a 112LSA and it has a EO # on it. While the duration numbers are about 10/12 degrees short of these, it just goes to show that passing emissions isn't dependent on LSA # only.

 

You can't base emissions purely on LSA. A Hot cam can pass emissions easily.

 

My current cam is not the cc305 but close in specs (222/230 .533/.544) The reason I'm considering the swap to the 846 is because 1. the motor is out of the car 2. I got the 846 pretty cheap 3. my goal is to run 11s full weight 4. I'm hoping the extra lift the 846 has over my current cam will be enough to get me into the 11s without killing my emissions. I figure another 10 rwhp would be worth the swap.

 

anyone else using the 846 or a comparible cam?

 

I'm not a certified cam expert, but here are my thoughts:

First, the CC305 is 0.544" on the exhaust and intake

You are only gaining 2 degrees on the intake and 0.019" lift on the exhaust lobe. The increased lift should also make the TQ curve a little more peaky.

That is not enough to justify a new cam in my opinion.

If you are looking for more horsepower, you will probably need a little more duration to shift that TQ band a little higher in RPM where you will see the HP numbers.

Dan

 

In comparisson to the cc 305 cam , it looks like they just extended the intake timing and left the exhaust timing the same as the 305, probably to fill the intake a little better.

 

well it looks like I may have no choice but to install the 846 cam. When my original motor came apart, it looks like it took the cam with it. I do agree that I stand a chance to see more power with more duration, but with emissions being a concern, I am pretty limited to what I have.