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Old 07-02-2011, 11:06:33 PM   #16
motor60
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Quote:
Originally Posted by 80-z28
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 $$$, there would prob be a stroker or 454 under hood.
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Old 07-03-2011, 03:15:41 AM   #17
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Quote:
Originally Posted by motor60
I have an SS motor from a 1970 Camaro, I think. This is the code on the block (CRE) and per NastyZ28 it is a 350ci, at, 300hp/SS with 10.25:1 compression. Motor runs strong stock; with the ignition and headers oh and an edelbrock 1406 Carb. Not sure if I would wanna go higher compression and worry about pinging, just wanna run pump gas for a DAILY DRIVER, more power, and some good ol muscle car sound! If I had the $$$, 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.
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Old 07-03-2011, 08:44:23 AM   #18
Todd80Z28
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Originally Posted by rustbucket79
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.
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Old 07-03-2011, 10:04:19 AM   #19
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Quote:
Originally Posted by quick79z
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.



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!!!!
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Old 07-03-2011, 10:05:14 AM   #20
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Quote:
Originally Posted by Todd80Z28
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
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Old 07-03-2011, 04:43:48 PM   #21
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Quote:
Originally Posted by motor60
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.
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Old 07-03-2011, 08:05:23 PM   #22
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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.
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1973 Firebird owned since 1994 runs mid 10's on motor and mid 9's on a 250 shot. BBC 439 2 speed,4.88 12 bolt,3600# full street car.
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Old 07-03-2011, 10:52:55 PM   #23
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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.
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Old 07-04-2011, 12:02:00 AM   #24
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Originally Posted by rustbucket79
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.
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1973 Camaro hot rod owned since 1989 runs high 12's. Mild 408 small block,th350,3.08 gears,ice cold a/c pumpin system ect.
1973 Firebird owned since 1994 runs mid 10's on motor and mid 9's on a 250 shot. BBC 439 2 speed,4.88 12 bolt,3600# full street car.
1970 Camaro ex pro stocker.
2011 Camaro RS,Jewel Tint.
2003 Silverado HD2500 and Wife's 2004 Malibu Maxx. Keeping my Family ALL GM!!!
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Old 07-05-2011, 01:06:27 AM   #25
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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.
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Old 07-05-2011, 11:09:40 PM   #26
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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.
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Old 07-06-2011, 01:14:19 AM   #27
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what about CS XE274H-10?
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Old 07-06-2011, 07:53:50 AM   #28
80-z28
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Originally Posted by Camarocore
what about CS XE274H-10?
With this cam he may have an issue with stock springs and converter.
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Original 350 standard bore
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TCI breakaway converter
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Old 07-07-2011, 12:55:57 AM   #29
motor60
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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.
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Old 07-07-2011, 02:35:12 PM   #30
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Quote:
Originally Posted by motor60
Looked up the XE268 cam. What is the H-10 model?

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

Quote:
Originally Posted by motor60
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

The Summit Racing branded version (made by Crane for Summit) is $133.95 for cam and lifters at Summit. Summit K00172 for $133.95

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

The Elgin version is $113.95 at Competition Products. Elgin E1785PM for $113.95 at Competition Products

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

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