View Full Version : Stock Motor Cam Suggestions?


motor60
07-01-2011, 12:30:47 PM
Have a stock 1970 SS 350 motor with HEI ignition and headers. Any cam suggestions for the stock motor? Looking for the lumpy sound; however, dont want it to mess with the vacuum ( dont wanna lose my brakes). Just quick performance for now until the cash flow speeds up for a new motor.

DRIVESHAFT
07-01-2011, 01:12:47 PM
Looking for the lumpy sound; however, dont want it to mess with the vacuum ( dont wanna lose my brakes). Just quick performance for now until the cash flow speeds up for a new motor.

Any cam that gives you the lumpy sound will have an affect on vacuum.
You can get a cam that will give you the sound and still allow enough vacuum for brakes, but your vacuum is probably going to drop by at least a third.

80-z28
07-01-2011, 07:32:31 PM
Comp XE268. Any bigger you will loose vacuum and need a bigger converter.

Damon
07-01-2011, 07:39:25 PM
Yeah, the XE268 would be the BIGGEST cam you should consider. I would make a case for the much smaller XE250, which is still about 10* more duration than a "stock" cam and on a tighter LSA. Next step up is the XE256 which is about 15* bigger than stock. All of them have much more modern lobe design which means they will usually out-perform a stock cam pretty much everywhere as long as you don't over-do it.

As was said above, forget lumpy cams. If you can hear the cam in an otherwise stock motor you've probably already gone too big.

tom3
07-02-2011, 12:06:53 AM
Just for fun I'd suggest the old grind for a 350/350 small block. Nice idle and good street manners, decent on gas. Should be pretty durable with the low additive oils of today too.

motor60
07-02-2011, 01:52:24 AM
Ok, so between those three choices, which would be best for my "stock" application? AND if I changed my converter, which stall would work best with those cams? OR which cam/converter combo is best for stock application?

motor60
07-02-2011, 01:54:41 AM
Looked up the XE268 cam. What is the H-10 model?

rustbucket79
07-02-2011, 02:12:20 AM
The correct cam would be the XE250 if you change nothing (assuming typical 8:1 dished/smog head 350) and the Xe256 would be decent if you go with a 2500 stall. The 246 pure energy is a decent choice as well.

All these cams will enhance your current engine, but likely won't have much if any "tone", but then what's better, a rough idle, or tire smoke? ;)

motor60
07-02-2011, 12:41:35 PM
Thx guys, but of course, i'd rather have the TIRE SMOKE!!

5spd540
07-02-2011, 12:44:32 PM
The xe268 is a nice cam for a stock motor

motor60
07-02-2011, 01:07:40 PM
xe268 it is then!! Do I have to replace lifters, valve springs, etc? Or can i just shove the cam in there and drive??

hhott71
07-02-2011, 01:23:53 PM
Have a stock 1970 SS 350 motor with HEI ignition and headers. Any cam suggestions for the stock motor? Looking for the lumpy sound; however, dont want it to mess with the vacuum ( dont wanna lose my brakes). Just quick performance for now until the cash flow speeds up for a new motor.

The Comp's HE268 or the Crane Energizer 272 (100052) is a mild torquey that pulls strong past 5500 rpm cam yet you can use all the stock accessories and hear some cam at idle.
There are MANY companies selling the same lobe profile.
.454" lift 218 dur 110 LC.
the 110 LC helps give the idle rumble.
a 112 or 114 LC won't have the rumble.
Crane (old Cam Dynamics) Energizer 100082 has 106 LC and a very sweet idle and power that smacks you at the hit of the throttle.

the Crane Energizers come with new lifters for what Comp wants for a cam.

sschevellefan
07-02-2011, 02:00:55 PM
The crane 274HO6 or the Elgine equivilant will give you more performance and a nice idle and won`t effect your brakes. The specs are 274 adv. 218@.050 .450 lift 106LSA. THe 106LSA will give it a rough idle and it`s mild enough that your brakes will work just fine. Cheaper than the comp cam too at about $100 for cam/lifters

80-z28
07-02-2011, 02:05:21 PM
xe268 it is then!! Do I have to replace lifters, valve springs, etc? Or can i just shove the cam in there and drive??
If your stock springs are not weak then you can use them. I would buy the cam and lifter kit. I would not use old lifters. Make sure you use a good break in oil with some ZDDP additive and follow the break in instructions and you should be good. You may be able to go with a thinner head gasket to bump your compression up a little, depending on what you already have. You can use your stock converter with this cam. I used this cam with my stock heads, intake , carb. and converter and I liked it. I only changed it because I upgraded the top end and went with the xe274 cam.

quick79z
07-02-2011, 04:13:01 PM
just did a stock 350 with the high energy 268 with a quick fuel ss650 annular on a performer air gap dui ignition cheap 1.5/8 headers it runs pretty good for a low cr stock engine , got 13s out of it and it is amazing on fuel and just has a small lope at 700 rpm idle

motor60
07-03-2011, 12:06:33 AM
You may be able to go with a thinner head gasket to bump your compression up a little, depending on what you already have. You can use your stock converter with this cam. I used this cam with my stock heads, intake , carb. and converter and I liked it. I only changed it because I upgraded the top end and went with the xe274 cam.

I have an SS motor from a 1970 Camaro, I think. This is the code on the block (CRE) and per NastyZ28 it is a 350ci, at, 300hp/SS with 10.25:1 compression. Motor runs strong stock; with the ignition and headers oh and an edelbrock 1406 Carb. Not sure if I would wanna go higher compression and worry about pinging, just wanna run pump gas for a DAILY DRIVER, more power, and some good ol muscle car sound! If I had the $$$, there would prob be a stroker or 454 under hood.

hhott71
07-03-2011, 04:15:41 AM
I have an SS motor from a 1970 Camaro, I think. This is the code on the block (CRE) and per NastyZ28 it is a 350ci, at, 300hp/SS with 10.25:1 compression. Motor runs strong stock; with the ignition and headers oh and an edelbrock 1406 Carb. Not sure if I would wanna go higher compression and worry about pinging, just wanna run pump gas for a DAILY DRIVER, more power, and some good ol muscle car sound! If I had the $$$, there would prob be a stroker or 454 under hood.


Crane energizer 272 is an excellent choice for that engine. .454" lift-218* Dur - 110* LC.

Some bowl clean up on those 041heads will pick up some power too.

The stock or generic Z28 springs work great with the above cam.

Todd80Z28
07-03-2011, 09:44:23 AM
The correct cam would be the XE250 if you change nothing (assuming typical 8:1 dished/smog head 350) and the Xe256 would be decent if you go with a 2500 stall. The 246 pure energy is a decent choice as well.

All these cams will enhance your current engine, but likely won't have much if any "tone", but then what's better, a rough idle, or tire smoke? ;)1970 ought to be a 10:1 engine, though, shouldn't it?

XE268 would be a good choice at that CR, IMO.

455 Formula
07-03-2011, 11:04:19 AM
just did a stock 350 with the high energy 268 with a quick fuel ss650 annular on a performer air gap dui ignition cheap 1.5/8 headers it runs pretty good for a low cr stock engine , got 13s out of it and it is amazing on fuel and just has a small lope at 700 rpm idle

The guys who suggested the 'correct cam for the application' and not the cam that will 'idle with a lope' are right on the money. The lopey idle is the byproduct of a cam designed to operate in a certain rpm range, not something that is chosen just because it sounds cool.

When I built my wife's 350 CID SBC in our 1986 Suburban, I used a custom-ground Ultradyne cam with .444"/.454" - 207/211 @ .050" on a 112 LSA. This cam pulls high vacuum (17 in/Hg) and has explosive torque in an otherwise stock, dish-top 350, and this cam will install and work with stock valvesprings and stock converter.

Some of the cams suggested are similar in specifications to this one.

By comparison, the cam in my Pontiac 350 is another Ultradyne custom grind featuring .466"/.467" - 220/226 @ .050" on a 111.5 LSA. This cam is deceiving.

http://i575.photobucket.com/albums/ss196/10851Man/Pontiac%20Stuff/th_AWCruiseNightVisalia06-25-2011.jpg (http://s575.photobucket.com/albums/ss196/10851Man/Pontiac%20Stuff/?action=view&current=AWCruiseNightVisalia06-25-2011.mp4)

It idles with quite a lope, but also with 15-17 in/Hg of vacuum, most likely due to my high static compression ratio (10.00:1) but you would HATE this cam in a car with an automatic and a stock converter!!!!

455 Formula
07-03-2011, 11:05:14 AM
1970 ought to be a 10:1 engine, though, shouldn't it?

XE268 would be a good choice at that CR, IMO.

Good point...I like wider LSA cams (112-114) in higher SCR motors....Robert

80-z28
07-03-2011, 05:43:48 PM
I have an SS motor from a 1970 Camaro, I think. This is the code on the block (CRE) and per NastyZ28 it is a 350ci, at, 300hp/SS with 10.25:1 compression. Motor runs strong stock; with the ignition and headers oh and an edelbrock 1406 Carb. Not sure if I would wanna go higher compression and worry about pinging, just wanna run pump gas for a DAILY DRIVER, more power, and some good ol muscle car sound! If I had the $$$, there would prob be a stroker or 454 under hood.
I did not realize that your compression was that high. In my opinion the xe268 or any cam from a reputable manufacturer with about the same specs will be a good choice.

Rich Schmidt
07-03-2011, 09:05:23 PM
Back in the day,I ran a flat piston 350 with 68cc stock heads,and a 278HMV Crane(now called the Powermax series) it had a slightly lope,but idled great at 700rpm out of gear(about 600 in gear),and seemed happy with a 2500 stall(cheapie $99 1000 over stock) convertor. If you dont want to change the convertor then go with the Powermax272,but expect a little less lope. With headers,almost any dual plane intake(I used an old port matched Wieand 8004 with a notch cut in the planum) and a 750 carb it will be a good upgrade over stock.

BTW,I liked that HMV 278 so much that I bought another one over 20 years later and currently running it with 1.6 rockers in the 10.2:1 408 with the exact same heads from back in the day in Frankie. It idles stock in the 408,but runs 12's with just mildly ported camel hump heads.

rustbucket79
07-03-2011, 11:52:55 PM
I'm assuming by 1970 the heads are open chambers. It is entirely possible the engine has closed chamber heads, or anything else, since the engine is some 40 years old it may well be rebuilt with different than factory components. Best to do a compression test and find out the head casting numbers before chosing the final cam.

Rich Schmidt
07-04-2011, 01:02:00 AM
I'm assuming by 1970 the heads are open chambers. It is entirely possible the engine has closed chamber heads, or anything else, since the engine is some 40 years old it may well be rebuilt with different than factory components. Best to do a compression test and find out the head casting numbers before chosing the final cam.

I thought he was talking about a small block here.

rustbucket79
07-05-2011, 02:06:27 AM
That's what I'm talking about, 350 small block. Other than the LT-1, I was assuming the other 350's would be running smog heads. He should confirm what heads he has.

Air_Adam
07-06-2011, 12:09:40 AM
Stock '70 SS engine should have the same castings as the LT1 as I recall - minus the screw-in studs and 2.02/1.60 valves.

Camarocore
07-06-2011, 02:14:19 AM
what about CS XE274H-10?

80-z28
07-06-2011, 08:53:50 AM
what about CS XE274H-10?
With this cam he may have an issue with stock springs and converter.

motor60
07-07-2011, 01:55:57 AM
So, sounds like the Crane 274 sounds like a good choice? and It comes with the lifters as a package? Does everyone agree? Dont wanna install the cam and LOSE my brakes.

BigEd36
07-07-2011, 03:35:12 PM
Looked up the XE268 cam. What is the H-10 model?

An H-10 is a 4-7 swap cam.

So, sounds like the Crane 274 sounds like a good choice? and It comes with the lifters as a package? Does everyone agree? Dont wanna install the cam and LOSE my brakes.

It's a good choice. But you can get the benefits of this grind without paying for the Crane name on the box.

The Crane version is $209.95 for cam and lifters at SummitCRN-100172 for $209.95 (http://www.summitracing.com/parts/CRN-100172/)

The Summit Racing branded version (made by Crane for Summit) is $133.95 for cam and lifters at Summit. Summit K00172 for $133.95 (http://www.summitracing.com/parts/SUM-K00172/)

The Elgin CL-1785-PK cam/lifter kit is $99.95 at Northern Auto Parts. CL-1785-PK Elgin cam/lifter kit for $99.95 (http://www.northernautoparts.com/ProductModelDetail.cfm?ProductModelId=17034)

The Elgin version is $113.95 at Competition Products. Elgin E1785PM for $113.95 at Competition Products (http://www.competitionproducts.com/Elgin-Hyd-Flat-Tappet-Cam-Lifter-Kit-Chev-SB-450_450/productinfo/E1785PM/)

Not to further muddy the waters but I have another suggestion to consider. Since your engine has more compression than the '71 and newer smog engines you could handle a little more duration. I like single pattern cams in the older small blocks so I would suggest considering the Howards Cams #112431 cam. They give specs of .450 lift and 223* at .050, basically the same specs as the 327ci 350hp cam, and very close to the 350ci 350hp cam. But Howards grinds this cam with your choice of 106* (#112431-06), 108* (#112431-08), 110* (#112431-10), or 112* (#112431-12) lobe spacing angle, all tighter than the 114* that Chevrolet used so they could have a smooth idle and lots of vacuum for the masses. As mentioned earlier, about 224* @ .050 is the max you would want to run with a stock torque converter. 224* is also the intake duration on the XE 268 cam that has been suggested multiple times here. A 108* LSA would be a good compromise IMO. You would have a bit of rump rump, it would bring on great torque, but not be too radical. Even the 110* (same as the XE 268) should be a little stronger torque than the XE 268 due to being a single pattern cam (they usually have more torque than a split pattern cam). Here's a screen shot of the listing for the #112431-08 from www.howardscams.com

http://i29.photobucket.com/albums/c270/BigEd36/Forum%20Post%20Pics/Howards112431-08.jpg

1BAD78
07-07-2011, 06:55:59 PM
Crane energizer 272 is an excellent choice for that engine. .454" lift-218* Dur - 110* LC.

Some bowl clean up on those 041heads will pick up some power too.

The stock or generic Z28 springs work great with the above cam.

I ran this cam on a stock motor once. Makes good power and sounds pretty good.

motor60
07-24-2011, 10:55:56 PM
What is an LSA cam?

DRIVESHAFT
07-25-2011, 01:13:12 AM
LSA = Lobe separation angle
http://clubs.hemmings.com/clubsites/MTFCTulsa/cams/images/twolobes4.gif

motor60
07-26-2011, 06:23:41 PM
What stall converter should I use with these cams? With Crane 272?

motor60
07-28-2011, 01:15:21 AM
Alo, which stall convertor? What size? Any brand/make in particular?