Cam choice for sbc

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11-05-2007, 10:58 AM
18436572

Cam choice for sbc

Looking for advice on cam choice.

Currently, running vortec heads with Comp Cam oval springs and roller tip rockers, a Comp Cam XE262 cam, headers, edlebrock aluminum dual-plane intake with JET stage II Q-jet carb, Petronics billet HEI distributor, and Keith Black hypernuematic 10:1 pistons, and balanced to 6500 rpm.
I run a manual 5-speed transmission with a 3.43 posi rearend.
This is a daily driver and a lot of fun.
I want more horsepower and not concerned with gas mileage or idle quality.

Should I run a single pattern cam or dual pattern cam?

Looking around the 280 duration and 480 lift.

Thanks for the advice!!!
11-05-2007, 03:46 PM
gassersrule_196

use the 280-h comp cam !!!!!
11-05-2007, 06:07 PM
18436572

I understand!
You like the single pattern profile cam.
What is the advantage on the street and what might I be giving up?
11-05-2007, 06:43 PM
18436572

These are stock re-man vortec heads with beehive springs.
I'm currently running the Comp Cam XE262 cam but want more than this mild cam. Got the headers/exhaust with 5 speed manual tranny and 3.43 posi out back - but want more! Don't usually go over 5500 rpm. Gas mileage and idle quality doesn't matter.
Dual pattern or single pattern AND what are the advantages/dis-advantages?
11-05-2007, 06:47 PM
erik erikson

Quote:

Originally Posted by 18436572

Looking for advice on cam choice.

Currently, running vortec heads with Comp Cam oval springs and roller tip rockers, a Comp Cam XE262 cam, headers, edlebrock aluminum dual-plane intake with JET stage II Q-jet carb, Petronics billet HEI distributor, and Keith Black hypernuematic 10:1 pistons, and balanced to 6500 rpm.
I run a manual 5-speed transmission with a 3.43 posi rearend.
This is a daily driver and a lot of fun.
I want more horsepower and not concerned with gas mileage or idle quality.

Should I run a single pattern cam or dual pattern cam?

Looking around the 280 duration and 480 lift.

Thanks for the advice!!!

There is not a stock sbc head out there that I would run a single pattern cam with.
I would always try and favor the exhaust by 6 to 8 degree's.
11-05-2007, 06:56 PM
18436572

Great advice!
Any particular favorite grind?
11-05-2007, 07:01 PM
erik erikson

Quote:

Originally Posted by 18436572

Great advice!
Any particular favorite grind?

You could run more cam but I think I would run more gear first and then look at the larger cams.
Make sure you have your valve springs checked.
11-05-2007, 08:36 PM
18436572

brand new Comp Cam beehive springs.
any advice on a good dual pattern cam?
11-06-2007, 08:05 AM
Racecar100

284 Duration with 480 lift it a very popular grind for mild street. It has very nice sound... I sold lot of that cam back in the 80'S and 90'S. That Grind was by General Kentic now I don't know who bought out the GK Cam.
11-06-2007, 08:23 AM
18436572

Thanks for that advice Racecar!
Now I am tossed between two cams:
272/282 442/465 OR
282/292 465/480 ??
Crower Cams call a 284 duration cam an Ultra High Performance strip cam and you use terms like mild street. I consider the Comp Cams 262XE cam a mild street cam.
So you think I'll be OK on the street with a manual tranny with a 284 cam???
11-06-2007, 11:31 AM
Racecar100

I would go with this cam if you put 1.6 rocker on Intake side.
272/282 442/465
11-06-2007, 01:00 PM
18436572

Thanks for the reply
11-06-2007, 01:39 PM
Racecar100

I would put it in advance at 4°
11-07-2007, 07:51 AM
18436572

Thanks racecar for all the advice. I will advance the cam 4 degrees but will keep the rockers all the same. I plan to do this the weekend after thanksgiving and will post my results shortly after that.
11-07-2007, 08:23 AM
erik erikson

Quote:

Originally Posted by 18436572

Thanks racecar for all the advice. I will advance the cam 4 degrees but will keep the rockers all the same. I plan to do this the weekend after thanksgiving and will post my results shortly after that.

I would be very careful when you advance the cam.
Some of the Comp cams already have 4* of advance built in to them.
I will guess he wants to advance it to move the power-band down a little or compensate for timing chain stretch.
11-09-2007, 07:13 AM
18436572

Would 8 degress total be too much?
How would that effect my ignition timing?
Would I still start with about 10 degrees and 32 degrees overall?
I have degree bushings down to 2 degrees.
11-09-2007, 07:47 AM
Racecar100

Quote:

Originally Posted by 18436572

Would 8 degress total be too much? No
How would that effect my ignition timing? None
Would I still start with about 10 degrees and 32 degrees overall? Yes that will be fine. But no more that 36 totalI have degree bushings down to 2 degrees.

The answer is posted behind your questions.....
11-09-2007, 08:11 AM
18436572

How do I see it?
11-09-2007, 09:32 AM
Racecar100

The answer are in Blue in above post.
11-09-2007, 10:02 AM
18436572

it didnt show at first but did now thanks
11-11-2007, 04:36 PM
tango

Quote:

Originally Posted by 18436572

Looking for advice on cam choice.

Currently, running vortec heads with Comp Cam oval springs and roller tip rockers, a Comp Cam XE262 cam, headers, edlebrock aluminum dual-plane intake with JET stage II Q-jet carb, Petronics billet HEI distributor, and Keith Black hypernuematic 10:1 pistons, and balanced to 6500 rpm.
I run a manual 5-speed transmission with a 3.43 posi rearend.
This is a daily driver and a lot of fun.
I want more horsepower and not concerned with gas mileage or idle quality.

Should I run a single pattern cam or dual pattern cam?

Looking around the 280 duration and 480 lift.

Thanks for the advice!!!

I think the Comp cams Xtreme Energy CS XE268H-10 will work great in your SB set up . It is 224/230 at .050 and 477/480 lift with 110 lobe separation . You can install it 4% adv .
11-12-2007, 03:31 AM
69elko

Better yet, check the cam card when you get the cam in. It will usually say "No need to advance this cam, it is already advanced 4 degrees". Not in those exact words but you get the point. Almost all of comp cams have 4 degrees advance built into them. AND YES, 8 degrees advance will hurt your performance.

Just to clear things up... this is referring to cam timing. I believe you are mixing it up with ignition timing. This has nothing to do with turning your distributor. This has to do with the relationship between when your valves open and where the piston is when they open.
11-12-2007, 06:38 AM
erik erikson

Quote:

Originally Posted by 18436572

Would 8 degress total be too much?
How would that effect my ignition timing?
Would I still start with about 10 degrees and 32 degrees overall?
I have degree bushings down to 2 degrees.

If you have to move a cam "around" more than 4 degree's you have the wrong cam in it.
11-25-2007, 04:09 PM
18436572

Gassers Rule and Racecar was right. I used a 282/292 with 480/490 lift and the cam is GREAT!!! Of course I run a 5 speed manual tranny with 10:1 compression and 3.43 posi in the rear - BUT - this cam is very responsive above 2500 rpm and winds to 5500 very fast. It is also well mannered on the street and in traffic.
If I had to do it over again - I would go even one larger.
I highly recommend this cam to all hot rodders.
11-25-2007, 06:28 PM
gassersrule_196

:D i gotta remember u can go a little bigger in a 350 and not over cam it :LOL:
11-25-2007, 08:31 PM
69elko

What brand cam is that?
11-26-2007, 06:03 PM
18436572

This is a Summit Racing brand cam. I have had good luck with these cams in the past and the price is right. I also like these cams because if you compare the duration to other cam makers, these Summit cams have a little less lift. This is important to me for a variety of reasons, but mainly due to my stock vortec heads.
And one other thing on this cam, I did install it 4 degrees advanced. I used the Comp Cam degree bushing I bought from Summit Racing. It was cheap and installed very easy.