moving cam ?

rod · 12-16-2009, 07:04 PM

i have a Jessel belt system on my 265. i degreed the cam in, and had to go -1 to get it 'straight up'. my desk top dyno says +2 is the best HP.
my question is: to get +2, do i move the cam to +1, [that would move the cam 2 degrees] or to +2, [which would be 2 degrees + from true 0].?
seems sort of picky, however this small baby mouse needs everything it can get.
the chart also showed +4 to be very close, loose a little at 5k and gain a little at 7k.
thanks rod

Alan Roehrich · 12-16-2009, 07:54 PM

No, to get 2 degrees advanced, you need to move the cam 2 degrees advanced from straight up. What matters is where the cam is, not what the marks on the timing components say.

Mike Taylor 3601 · 12-16-2009, 08:11 PM

If your on -1 move to +1 will be 2degrees adv. What I always do is mark cam spider w/ sharpie as example say 106 is straight up for your cam I would mark it -1=106 so you always have your baseline to go back to.
Mike Taylor 3601
say intake CL calls for 106 and to degree to 106 spider shows -1 then you move to +1 you'll be @104

Bryan Broaddus · 12-17-2009, 12:16 AM

I have found that the marks don't always tell the truth. The only way to know for sure is to change it when you assemble and measure it at several different spots. Although I have moved mine around quite a bit it doesn't seem to make too much difference on the time ticket. But this was all done on a Super Stock 454 that makes quite a bit of torque so it may change your combo more.
I have found that only one place make the best power when we dyno and it seems to run the best there on the track too. Only talking .03 or so difference either way.

On your earlier post the merge collector does change the jetting some. A lot of it has to do with how small the neck down is and how long overall collector is. We have seen the smaller the neck down size the narrower and higher the power band. Hope this will help!

12-16-2009, 07:04 PM	#1
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 308 Likes: 0 Liked 17 Times in 13 Posts	moving cam ? i have a Jessel belt system on my 265. i degreed the cam in, and had to go -1 to get it 'straight up'. my desk top dyno says +2 is the best HP. my question is: to get +2, do i move the cam to +1, [that would move the cam 2 degrees] or to +2, [which would be 2 degrees + from true 0].? seems sort of picky, however this small baby mouse needs everything it can get. the chart also showed +4 to be very close, loose a little at 5k and gain a little at 7k. thanks rod

12-16-2009, 07:54 PM	#2
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,934 Likes: 1,020 Liked 1,093 Times in 286 Posts	Re: moving cam ? No, to get 2 degrees advanced, you need to move the cam 2 degrees advanced from straight up. What matters is where the cam is, not what the marks on the timing components say. __________________ Alan Roehrich 212A G/S

12-16-2009, 08:11 PM	#3
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,303 Likes: 198 Liked 116 Times in 48 Posts	Re: moving cam ? If your on -1 move to +1 will be 2degrees adv. What I always do is mark cam spider w/ sharpie as example say 106 is straight up for your cam I would mark it -1=106 so you always have your baseline to go back to. Mike Taylor 3601 say intake CL calls for 106 and to degree to 106 spider shows -1 then you move to +1 you'll be @104 Last edited by Mike Taylor 3601; 12-16-2009 at 08:15 PM.

12-17-2009, 12:16 AM	#4
Bryan Broaddus Member Join Date: Jun 2002 Posts: 100 Likes: 1 Liked 18 Times in 3 Posts	Re: moving cam ? I have found that the marks don't always tell the truth. The only way to know for sure is to change it when you assemble and measure it at several different spots. Although I have moved mine around quite a bit it doesn't seem to make too much difference on the time ticket. But this was all done on a Super Stock 454 that makes quite a bit of torque so it may change your combo more. I have found that only one place make the best power when we dyno and it seems to run the best there on the track too. Only talking .03 or so difference either way. On your earlier post the merge collector does change the jetting some. A lot of it has to do with how small the neck down is and how long overall collector is. We have seen the smaller the neck down size the narrower and higher the power band. Hope this will help! __________________ Bryan Broaddus 7568 STK ,SS