View Full Version : Are these cams decent for my application?


71cmro
01-06-2011, 10:42:09 AM
An engine builder friend is suggesting either of these two cams for my application.
http://www.summitracing.com/parts/SUM-K1105/

http://www.hdmaddog.com/Chevrolet-GMC/Camshafts-Lifters-Cam/SB-Chevy-327-350hp-Complete-p3678288.html

Here is what I am dealing with.
- Engine is a 1969 block 4 bolt main 350
- Vortec cast iron heads with a max lift of .475. Stamping #12558062
- Do not know what pistons I have. Never removed the heads but believe them to be flat top since everything else on the engine was vintage 1969 and my engine guy said dish pistons did not start showing up until the early 70's.
- Block has been decked but not sure how much. Can no longer see any engine code stamping on the deck.
- Will be running an edelbrock or similar up to 5000 rpm intake.
- Highly tuned quadrajet.
- Mallory slightly better than stock distributor.
- Full length headers going to Flowmaster dual exhaust that dumps out the rear
- 3.42:1 posi rear.
- Stock converter. Don't want to change it out at this point. Maybe in the future

Want to get as much as possible without changing anything else.

Goal is good street manners but with a few balls.

Thanks for the help guys!

sweetsoul
01-06-2011, 10:48:37 AM
i would go with the second one , if it was a daily street driver

earnhardtgm3
01-06-2011, 11:01:46 AM
Ditto on the second cam choice

Cardinal
01-06-2011, 12:21:58 PM
Personally, I wouldn't choose either of those cams. I prefer the Comp Cams 268H: http://www.summitracing.com/parts/CCA-CL12-210-2/

5spd540
01-06-2011, 12:25:17 PM
I woud use the 268h or the 270h and if you want to push it go with the 280h

BigEd36
01-06-2011, 12:46:33 PM
Of the two you listed the 2nd cam would be my choice, it's the old 327/350HP cam, and is used in the GMPP 350/290HP engine. But neither of these cams would be my first choice for your application. My choice would be the cam that GMPP uses in the 350HO/330 HP and 350/350HP circle track crate engines or a copy of it. Pace Performance uses the same cam in their Pace Pac 350/300HP crate engine, which is the same base engine as the Universal 350 or the 350/290HP engine. It has better street manners and still makes more HP than the 327/350HP cam. Every cam company has a close copy of it. The Lunati Bare Bones #10001LK cam/lifter kit and the Speed Pro #1013R both have a few thousandths more lift and 2* more duration on the intake/exhaust, so I consider them the same cam. The Lunati cam/lifter kit is $99.95 at Summit Racing (http://www.summitracing.com/parts/LUN-10001LK/). Member Z28rod (http://www.nastyz28.com/forum/member.php?u=34271) reports very positive results with this cam. The Speed Pro cam/lifter kit is $91.99 at Northern Auto Parts (http://www.northernautoparts.com/ProductModelDetail.cfm?ProductModelId=18649). Don't be put off by the rpm range given by Speed Pro, I don't know why but Speed Pro always seems to give a very low rpm range for their cams. These cams will put your max HP at 5000-5300 rpm, and pull strong to 6000 or more. GMPP gives the 350/350 circle track a recommended max rpm of 5500 but the guys that race them in the crate engined late models wind them over 6000 rpm for best performance.

The Comp Cams High Energy 268 or the Magnum 270 mentioned above would also be good choices. The HE 268H isn't Comp Cams best selling cam for no reason! The Speed Pro 1169R has the same specs (just .004" more lift) and sells for just $108.99 for the cam/lifter kit at Northern Auto Parts (http://www.northernautoparts.com/ProductModelDetail.cfm?ProductModelId=18651)

z28rod
01-06-2011, 02:16:09 PM
I Have Used The Cam That Cardinal Spec'd. Its A Tq Monster, Id Use That One.

71cmro
01-06-2011, 02:47:39 PM
Would the comp cam 270 give me a little lope to the idle?

1981zapper
01-06-2011, 02:53:51 PM
The second one you picked out is the L79 Spec, it will work for your application

BigEd36
01-06-2011, 02:54:10 PM
Would the comp cam 270 give me a little lope to the idle?

Any of these cams we've recommended will give you a nice lope to the idle.

BigEd36
01-06-2011, 03:01:28 PM
Here's a youtube clip with a Firebird with a mild 350 with a 270H cam.

http://www.youtube.com/watch?v=kcNmamZA3ro&feature=related

Rich Schmidt
01-06-2011, 03:45:48 PM
I like the 1st cam better,a lot less off the seat duration. You did see that the
exhaust lift is .488" right? It would be pretty close with your current valve springs/retainers.

ZS10
01-06-2011, 03:52:19 PM
- Stock converter.

Kind of limits the choices. 268H at the most. I've used an Isky 264 Mega cam that was great a great street cam.

my24ktrat
01-06-2011, 04:13:29 PM
...Use the CCXE 262 , it will have some nice torque, just my.02, DC:bowtie:

5spd540
01-06-2011, 05:38:12 PM
If you are after sound go with a thumpr cam

71cmro
01-06-2011, 05:41:43 PM
I am after the best combination of sound, power and street drivability. So far it looks like most are leaning towards the comp 268 or 270. I just don't quite understand the duration differences and what that means to me.

BigEd36
01-06-2011, 06:36:15 PM
I am after the best combination of sound, power and street drivability. So far it looks like most are leaning towards the comp 268 or 270. I just don't quite understand the duration differences and what that means to me.

Longer duration camshafts move the power further up in the rpm range, but will take away some of the low rpm torque. Shorter duration will give more low end torque but give up some high rpm horse power. That's why you can run "more cam" when you have a higher stall torque converter and/or lower gearing. The torque converter lets the engine get the rpm up to the point it has more power before you take off.

Here's an article in Popular Hot Rodding that will explain a lot about camshafts and the terms used. Be the camshaft expert (http://www.popularhotrodding.com/tech/0607phr_camshaft_basics/index.html)

71cmro
01-06-2011, 07:27:43 PM
Ok, looks like I will be choosing the Lunati cam here http://www.summitracing.com/parts/LUN-10001LK/

Since my heads have the crappy valve springs in them from when they were made what springs and rockers would you recommend.
- Vortec cast iron heads with a max lift of .475. Stamping #12558062

Thanks for the help so far!

71cmro
01-06-2011, 07:28:16 PM
Longer duration camshafts move the power further up in the rpm range, but will take away some of the low rpm torque. Shorter duration will give more low end torque but give up some high rpm horse power. That's why you can run "more cam" when you have a higher stall torque converter and/or lower gearing. The torque converter lets the engine get the rpm up to the point it has more power before you take off.

Here's an article in Popular Hot Rodding that will explain a lot about camshafts and the terms used. Be the camshaft expert (http://www.popularhotrodding.com/tech/0607phr_camshaft_basics/index.html)

Good article so far. Thanks.

71cmro
01-19-2011, 08:02:37 AM
Is this a decent deal for the whole set. I am running a Vortec 64cc setup.

http://www.amazon.com/Competition-Cams-K122422-Chevrolet-262-400/dp/B000CEM5IO/ref=au_pf_pfg_s?ie=UTF8&Model=Camaro|432&n=15684181&s=automotive&Make=Chevrolet|47&Year=1971|1971&newCar=1&carId=002

DesmoEd
01-19-2011, 08:59:12 AM
http://www.lunatipower.com/Product.aspx?id=1982&gid=287



Vortec heads and stock convertor - this would be my choice.

z28rod
01-19-2011, 10:42:17 AM
i have used this cam in a mild build 350 almost identical to yours but with stoch heads with some porting work done, with your vortec heads and this cam you should be at 330 hp and 380 tq. get it youll love the lope and its super streetable, works with stock converter and has great vac. for pwr. brakes.http://www.summitracing.com/parts/LUN-10001LK/

hhott71
01-19-2011, 10:42:46 AM
Crane energizer series is well worth considering. You can buy the Cam by itself or in packages with the Lifters included. You can get matching springs too, but what you have now will be plenty for either cam.

http://www.cranecams.com/product/cart.php?m=product_detail&p=23943
.454" lift 218 Dur
Same as Comps HE 268. You will hear some idle rumble and good power through out the driving range.

or

http://www.cranecams.com/product/cart.php?m=product_detail&p=23945
for more performance.

.470" lift 222 dur

It sounds better than the 350hp/327 cam and has more power from idle to max rpm.

flowjoe
01-19-2011, 02:22:20 PM
Crane energizer series is well worth considering. You can buy the Cam by itself or in packages with the Lifters included. You can get matching springs too, but what you have now will be plenty for either cam.

http://www.cranecams.com/product/cart.php?m=product_detail&p=23943
.454" lift 218 Dur
Same as Comps HE 268. You will hear some idle rumble and good power through out the driving range.

or

http://www.cranecams.com/product/cart.php?m=product_detail&p=23945
for more performance.

.470" lift 222 dur

It sounds better than the 350hp/327 cam and has more power from idle to max rpm.

Is Crane making automotive camshafts again? I thought the company that bought Crane's assets was just doing motorcycle stuff.

hhott71
01-19-2011, 04:57:52 PM
www.cranecams.com

Are back in business !!!

BondoSpecial
01-19-2011, 05:10:51 PM
Um you can't use the first cam because it is .465/.488. That will crash the vortec heads.

I would use this cam

http://www.summitracing.com/parts/SUM-K1104/

224/224 .465"/.465". It is spec'd like the 327/350 cam but it has a little more lift.