[pi71]

69 camaro
350 (1973 or 74) casting
291 camel hump heads
headers
aluminum dual plane intake
edelbrock 600cfm carb non emission
HEI
auto tranny(for now)

What camshaft would wake this motor up? i cruise more than anything , rarely race. I want it reliable and not have to worry about driving in town.. or just leave the stock cam in? thanks

[FiveFeezy]

Comp Cams 270 Magnum

[pi71]

found this about the comp 270

. ""I got looking through some magazines and see an advertisement for Competition Cams. They made a bunch of Claims about their 270 magnum cam, and 90 percent of them turned out to be false. I even called comp cams and talked to their tech people, and they had nothing good to say about my performer cam that had been working good for me for so long. They said their 270 mag cam would work fine with my gears and compression ratio, and they said that I could even use a stock torque converter! I should have known better at this point, because the 270 mag specs out at 224,224 Int/Exh duration at .050 valve lift with .501,.501 Int/Exh lift.

Now, the performer specs out at:204,214 Int/Exh duration at .050 valve lift, and about (not positive on this part) .448,.472 Int/Exh lift. As you can see, the performer is much more mild than the 270 magnum, and I already knew at this point that the performer needed more than a stock stall speed to really take full advantage of the its powerband. But comp cams told me what I wanted to hear: 'You'll really be able to hear this cam idle'. So I bought it. And when I fired it up for the first time, underneath my carport with my good buddy who helped me install it, It sounded really tuff. I loved it!

Then I drove it. I could barely smoke the tires anymore (when in the past I could do it so easily it was almost annoying) and I also had a terrible bog off the line. My times at the track improved by only .06 (thats 6 HUNDRETHS) of a second, and gas and driveablility went south! My performer could have gone faster if I would have bought some better tires to hook it up.

Moral of the story: find someone you trust to help you decide what you need for your combo, and don't let that BAD idle fool you. Torque is what moves your car. Many manufacturers put nothing but Chevy or Ford grinds on an Olds cam. Compare the specs. "

[Malibu73]

Check out the Voodoo series from Lunati, dyno tested to beat comps XE cams of similar grinds.

[454C10]

Good story. And the moral is..... Do not over cam your engine! Especially a street engine.

You didn't say what gears or what torque converter you had but it sounds like the whole drive line is stock. So a mild cam is what you need.

Stock heads typically don't flow well on the exhaust side so more exhaust duration would be nice. Also, tighter lobe separation angles (LSA) will help out poor flowing stock heads.

I also like the Performer cam for your engine (204/214) but feel the LSA could be a little tighter (108 to 110). The compcam 270 requires gears, converter, and valve springs and would not be my first choice for a mild mannered street car. A 260H (212/212) would be the largest that I would recommend. A 252H makes a nice street cam (206/206) but those stock heads could benefit from a little more exhaust duration. Avoid the compcam xtreme cams, they have a history of going flat. Stay with a cam that has mild ramps, it will make a little less power, but it will live a long quiet life with a stock valve train.

A good combo for a 3.08 gear and autotrans with stock converter would be a set of 64cc edlebrock performer heads with a 260H or 252H cam. You are down in power because of the stock heads and teeny tiny stock cam (195/200).

[DeathRattle]

270 mag worked fine for me. the total package is needed. More compression, stall, gears. If that article is true he was just misled by the tech at comp cams. It doesnt make the cam itself bad because it wasnt installed with the right combo of parts.

[pi71]

Originally Posted by 454C10

but those stock heads could benefit from a little more exhaust duration. . You are down in power because of the stock heads ).

my heads are camel hump heads shouldnt they flow pretty good?

[pi71]

will i see much gain from stock cam to a edelbrock performer cam 204/214 ?

[454C10]

Those old double humps were good in their day but don't compare very well to the new style heads.

Check out the site:

http://www.chevyhiperformance.com/te...ench_database/

Here as an example for the flow difference.

Performer head
lift Intake exhaust
.050 32 20
.100 64 44
.200 121 95
.300 174 134
.400 216 159
.500 235 177

462's
lift Intake exhaust
.050 18 27
.100 50 54
.200 119 88
.300 167 116
.400 198 128
.500 211 134


Yes, you will get a fairly big gain with the performer cam as compared to the stock cam. The gm crate engine use the performer cam as an optional upgrade on the goodwrench 350 engine.

[454C10]

check out this site:

http://www.sallee-chevrolet.com/fram...rformance.html


There are two 350 crate engines listed on this page. The difference is the cam.

Stock cam is 195/202 and the engine made 249hp at 5000 rpm and 304 ftlbs at 3500 rpm

With a 204/214 cam (performer cam) the engine made 285hp at 4600 rpm and 355ftlbs at 3600 rpm. That is +26hp and +51ftlbs with the slightly bigger cam.

And with better heads you could add another 25hp and another 35ftlbs of torque.

[pi71]

ill probably never see those rpms, i wonder what the difference is at 4000 and under? im thinking when i pull the manifold if all is well ill leave it alone,
then again talking like this,,, maybe im on the wrong site..or getting old..lol

[F-BIRD'88]

This lil Isky 262/270 HL hyd cam Is big enough to give you some power in the midrange (a step up from the Performer cam), yet not so big that It is like a 270magnum.
It's "just right".

262-270 Adv dur 208/216@.050" .435-.445 112LSA Fine with 3.08's and a stock converter. Easy cruiser. Would be great with a 3.73 rear gear. Lots of snap in the mid range, when ya want it. Yet easy cruising.

[454C10]

The difference under 4000 rpm is +51ftlb of torque at 3500 rpms. Like installing a 383.

[pi71]

wow thats quite a difference, thanks