Comp Cam 280 XFI information needed?

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03-09-2007, 04:28 PM
Dave Severson

I cheat on cams. I have my favorite Tech Rep at Comp Cams. I just give him all the data and have one built. I'm mostly a chassis and suspension guy.
03-09-2007, 04:34 PM
sstruck383

Ah ok. I just sent Comp cams a request along with a few Custom camshaft people to see what they say but most of them don't give out the specs until its bought. Maybe I can get Erik back in here and see what he thinks would be better.
03-09-2007, 05:02 PM
erik erikson

The biggest thing is the trucks weight.
Keep in mind this is a 5,000 lbs. truck not a 3,000 lbs. street car.
I would cut some of the duration out of the cam to try and move the powerband down a little bit.
I would look more at cams that are in the 220 area at .050 area.
If you like Comp. then look at cam number 12-423-8 this is the largest cam I would ever run in your truck.
Next your heads are a little on the large size for what you are doing.
They are not bad, but again you are working with a truck.
Your combo. would be dead on if you had it in the 3,000 lbs. street car.
In fact I have the same cam on my bench but I had it cut on a small base circle to clear everything in a 383 I am building for a customer.
If you do want to use the larger cam you picked out with your heads, with the 3,000 stall then I would say go to a 4.10 gear to try and help the truck to move off the line.
03-09-2007, 05:06 PM
sstruck383

Quote:

Originally Posted by erik erikson

The biggest thing is the trucks weight.
Keep in mind this is a 5,000 lbs. truck not a 3,000 lbs. street car.
I would cut some of the duration out of the cam to try and move the powerband down a little bit.
I would look more at cams that are in the 220 area at .050 area.
If you like Comp. then look at cam number 12-423-8 this is the largest cam I would ever run in your truck.
Next your heads are a little on the large size for what you are doing.
They are not bad, but again you are working with a truck.
Your combo. would be dead on if you had it in the 3,000 lbs. street car.
In fact I have the same cam on my bench but I had it cut on a small base circle to clear everything in a 383 I am building for a customer.
If you do want to use the larger cam you picked out with your heads, with the 3,000 stall then I would say go to a 4.10 gear to try and help the truck to move off the line.

Thanks for the reply Erik, the truck weighs 4100 lbs with me in it. Had it weighed. Does this effect your suggestion now?
03-09-2007, 05:09 PM
erik erikson

Quote:

Originally Posted by sstruck383

Thanks for the reply Erik, the truck weighs 4100 lbs with me in it. Had it weighed. Does this effect your suggestion now?

I would still try and look at cams that are no more than 220 at .050 with your weight and gear ratio.
03-09-2007, 05:14 PM
sstruck383

Quote:

Originally Posted by erik erikson

I would still try and look at cams that are no more than 220 at .050 with your weight and gear ratio.

The 218/224 I have now is mild and its not a problem getting it moving even with the stock converter right now. It really comes on power at 2500 to 5000. What you think about the 224/230 on a 112lsa.
03-09-2007, 05:19 PM
erik erikson

Quote:

Originally Posted by sstruck383

The 218/224 I have now is mild and its not a problem getting it moving even with the stock converter right now. It really comes on power at 2500 to 5000. What you think about the 224/230 on a 112lsa.

Yes,it will work.
You could always advance the cam a few degree's if you thought it acted to large.
03-09-2007, 05:22 PM
sstruck383

I believe it to have about 4 degrees built in if I have the camshaft info right using the camshaft overlap, etc formulas.

Dyno Desktop shows the 230/236 on a 113lsa to peak around 5800 and the 224/230 on a 112lsa around 5500.
03-09-2007, 05:26 PM
erik erikson

Quote:

Originally Posted by sstruck383

I believe it to have about 4 degrees built in if I have the camshaft info right using the camshaft overlap, etc formulas.

Dyno Desktop shows the 230/236 on a 113lsa to peak around 5800 and the 224/230 on a 112lsa around 5500.

Yes,a lot of the Comp. cams have the 4 degree's advance built in to them.
Don't forget the timing chain will stetch the four degree's and maybe more.
03-09-2007, 05:28 PM
sstruck383

Quote:

Originally Posted by erik erikson

Yes,a lot of the Comp. cams have the 4 degree's advance built in to them.
Don't forget the timing chain will stetch the four degree's and maybe more.

Yea got ya, I'll be using a double roller with billet/steel gears. We can finish this through PMs if that's cool so we don't have to go back and forth so much.

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