Go Back   Corvette Forum > C3 Corvettes, 1968 - 1982 > C3 Tech/Performance
Sign in using an external account
Register Forgot Password?
Register Albums Search Today's Posts Mark Forums Read FAQ
Search
C3 Tech/Performance
V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette Sponsored by
VBP

Welcome to Corvetteforum.com!
Welcome to Corvetteforum.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Corvetteforum.com today!


Corvette Store
 
 
C6 Parts & Accessories
C5 Parts & Accessories
Wheels & Tires
Sponsored Ads
 
 
Vendor Directory
  
Reply
 
 
 
 
Thread Tools Search this Thread
Old 08-06-2007, 11:19 AM   #1
Tim H
CF Senior Member
 
Tim H's Avatar
 
Member Since: Oct 2000
Location: Southern Indiana
Default Comp Cams- CS EX274H-10 extreme series.

Anyone heard this cam in a SBC yet.
The web site doesn't really say if its rough idle or what, just good mid range torque. int-487/ex 490, dur 274/286 on a 110 lobe sep.
Tim H is offline   Reply With Quote
Old 08-06-2007, 12:08 PM   #2
weimer20
CF Senior Member
 
weimer20's Avatar
 
Member Since: May 2007
Location: Ventura California
Default

I'm running that cam in a 383 and it idles with a lope.. Sounds good and it idles below 1000 rpm with no probs at all.
weimer20 is offline   Reply With Quote
Old 08-06-2007, 01:58 PM   #3
Tim H
CF Senior Member
 
Tim H's Avatar
 
Member Since: Oct 2000
Location: Southern Indiana
Default

I want a lopy sounding cam, I have the 470/270 Comp cam now and its too tame. Either the 274 extreme or the 480/280 comp cam I think would sound good.
I really like Crane, but their cam site isn't very good compared to Comp so I ruled them out.
Tim H is offline   Reply With Quote
Old 08-06-2007, 02:08 PM   #4
The Money Pit
CF Senior Member
 
The Money Pit's Avatar
 
Member Since: Jun 2002
Location: Orrtanna Pa.
Default

Need to know engine size/specs to even begin a response here. In my 406 the Comp XE-274 idled like a stock 350.
__________________
80 Vette,406/AFR 195's,Isky Z-35 solid w/1.60 roller rockers,port matched RPM intake,Holley 3310 carb,3"custom dual exhaust,full manual reverse VB Rossler th400 trans,3.70 rear,QA-1 shocks,MT 295 55 drag radials rear,P245 60's front on Weld DragLites.



Here's a link to my website.
http://www.finitesite.com/markwallas/index.html
The Money Pit is offline   Reply With Quote
Old 08-06-2007, 02:16 PM   #5
Glensgages
CF Senior Member
 
Glensgages's Avatar
 
Member Since: Jan 2003
Send a message via AIM to Glensgages
Default

Quote:
Originally Posted by Tim H
Anyone heard this cam in a SBC yet.
The web site doesn't really say if its rough idle or what, just good mid range torque. int-487/ex 490, dur 274/286 on a 110 lobe sep.

I want a lopy sounding cam, I have the 470/270 Comp cam now and its too tame. Either the 274 extreme or the 480/280 comp cam I think would sound good.
I believe CompCams suggests the XE268H as the largest cam to be used with a stock converter, so the XE274H must be pretty radical:
I ran the 292H Magnum (.501"-lift, 244* @ .050", 110* LSA ) on the street with a 'tight' 10"-converter to/from the strip (10.3:1 355" SBC ), and it wasn't that-bad.....
__________________
Cross-Fire No'-Mo'
27,900-mile 1982 Coupe, original L-83 long-block with 650 Holley carb, dual-plane intake, 1.6:1 roller-rockers & 3.73 gears




14-ohs @ 95+ MPH, best-of 13.935 @ 99.14

GONE 7 FEBRUARY 2012, BUT NOT-FORGOTTEN
Glensgages is offline   Reply With Quote
Old 08-06-2007, 03:25 PM   #6
Tim H
CF Senior Member
 
Tim H's Avatar
 
Member Since: Oct 2000
Location: Southern Indiana
Default

Quote:
Originally Posted by The Money Pit View Post
Need to know engine size/specs to even begin a response here.
Maybe you do.
Tim H is offline   Reply With Quote
Old 08-06-2007, 03:30 PM   #7
Little Mouse
CF Senior Member
 
Member Since: Apr 2006
Default

Quote:
Originally Posted by Tim H View Post
I want a lopy sounding cam, I have the 470/270 Comp cam now and its too tame. Either the 274 extreme or the 480/280 comp cam I think would sound good.
I really like Crane, but their cam site isn't very good compared to Comp so I ruled them out.
I have a 2006 crane catalog 674 pages thick, crower catalog.
How about this lunati, cam and lifters # LUN-60104LK.
lift 504/525, 276/284 dur, 110 LSA. not hairy enough,
# LUN-60105Lk, lift 525/546 dur. 284/292 LSA 110.

Last edited by Little Mouse; 08-06-2007 at 04:03 PM.
Little Mouse is offline   Reply With Quote
Old 08-06-2007, 04:07 PM   #8
weimer20
CF Senior Member
 
weimer20's Avatar
 
Member Since: May 2007
Location: Ventura California
Default

Quote:
Originally Posted by Tim H View Post
I want a lopy sounding cam, I have the 470/270 Comp cam now and its too tame. Either the 274 extreme or the 480/280 comp cam I think would sound good.
I really like Crane, but their cam site isn't very good compared to Comp so I ruled them out.
I ran the 274 extreme in my 350 before I stroked it and it was more lopey in the 350. Still able to idle with enough vacuum for the power brakes. I like it in a street motor. I have the same cam in it again but now stroked to 383. I could have and should have gone up a step on the cam when I increased displacement. In a 350, I think you'll really be pleased with it.
weimer20 is offline   Reply With Quote
Old 08-06-2007, 04:10 PM   #9
Crab
CF Senior Member
 
Crab's Avatar
 
Member Since: Oct 2004
Location: Scottdale Pa
Default

Quote:
Originally Posted by Tim H View Post
I want a lopy sounding cam, I have the 470/270 Comp cam now and its too tame. Either the 274 extreme or the 480/280 comp cam I think would sound good.
I really like Crane, but their cam site isn't very good compared to Comp so I ruled them out.
I just ordered the 270H cam from Comp Cams, are'nt you happy with the performance,or just the lack of a lopey idle,or both?
Crab is offline   Reply With Quote
Old 08-06-2007, 05:59 PM   #10
Tim H
CF Senior Member
 
Tim H's Avatar
 
Member Since: Oct 2000
Location: Southern Indiana
Default

470/270 is a very nice/good cam with a noticable healthy sound to it.
I am just going to pull the engine and trans and do some fun high performance things to it, like a 3500 stall and new 350 race prep trans, heads ETC so I want a lopy cam.
The 470/270 makes alot of power!!!!
Tim H is offline   Reply With Quote
Old 08-06-2007, 09:04 PM   #11
Little Mouse
CF Senior Member
 
Member Since: Apr 2006
Default

3500 stall, more comp. very good, go for that 2nd lunati, lots of
lift for a 280s duration hydraulic flat tappit cam.
Hell I had a 270 crane in my 350 pickup, stock converter, power
sucking turbo 400, 3.07 rear gears.

Last edited by Little Mouse; 08-06-2007 at 09:16 PM.
Little Mouse is offline   Reply With Quote
Old 08-07-2007, 07:54 PM   #12
ddale1977
CF Senior Member
 
ddale1977's Avatar
 
Member Since: Dec 2006
Location: Keller TX
Default

Quote:
Originally Posted by Tim H View Post
Anyone heard this cam in a SBC yet.
The web site doesn't really say if its rough idle or what, just good mid range torque. int-487/ex 490, dur 274/286 on a 110 lobe sep.
I have this cam in my 350 auto. The machine shop said its going to 'sound like a corvette should'....(whatever that is). It does sound real good with my hooker sidepipes/headers. Get a lot of complements pulling into a parking lot.

I have honestly been having a little trouble with idle in gear. But, I've been working with Lars on timing and vacuum advance. I ordered a new vacuum advance per his recommendation and hope to correct the idle.

The cam is good off the line but even better about 30 mph and stomp it. I have vortec heads, edelbrock intake, q-jet. 2,500 torque converter. I like the cam just fine.

Good luck, Doug
ddale1977 is offline   Reply With Quote
Old 08-07-2007, 08:25 PM   #13
Tim H
CF Senior Member
 
Tim H's Avatar
 
Member Since: Oct 2000
Location: Southern Indiana
Default

Quote:
Originally Posted by ddale1977 View Post
I have this cam in my 350 auto. The machine shop said its going to 'sound like a corvette should'....(whatever that is). It does sound real good with my hooker sidepipes/headers. Get a lot of complements pulling into a parking lot.

I have honestly been having a little trouble with idle in gear. But, I've been working with Lars on timing and vacuum advance. I ordered a new vacuum advance per his recommendation and hope to correct the idle.

The cam is good off the line but even better about 30 mph and stomp it. I have vortec heads, edelbrock intake, q-jet. 2,500 torque converter. I like the cam just fine.

Good luck, Doug
If you would unplug the vacuum advance, buy some light springs and weights, put your timing at 36 at 2500rpms and about 23 at idle with a dialback timing light you wouldn't have to buy anything but a case of mountain dew or Dr Pepper and sit back and relax!!!!!!
But until then, you will spend more and more on distributar parts vacuum line and canisters and plug and unplug every vacuum port on the engine and carb until you strech the timing chain 10 degrees negetive and have to start over.
But heck I haven't had to raise the hood of mine for weeks now, but some call it exsercise
Tim H is offline   Reply With Quote
Old 08-07-2007, 09:45 PM   #14
vettenoir
CF Senior Member
 
vettenoir's Avatar
 
Member Since: May 2003
Location: LaSalle ON
Default

I'm running that cam in my 383. I'm very happy with the sound. A bit of a lope, but it doesn't sound like a full out race car either. Pretty good performance for a hydraulic flat tappet without crazy lift or duration. (See my signature...)



Bob
__________________

Specs:
'77 body/'81 seam-welded chassis, 409CI 10.3:1 SBC, Dart Pro 1 heads, Performer RPM intake, Holley C950 TBI, 1 3/4" Hooker super comp headers, TH200-4R, 3.73 diff., VBP dual mount front & rear leaf springs, upper A-arms, and spreader bar, Drag-Vette 6-link, 17" Billet Specialties rims with Kumho XS 245/45R17, 275/40R17 tires
Alpine stereo /w USB and bluetooth connection
11.91 @ 114 mph
vettenoir is offline   Reply With Quote
Old 08-08-2007, 12:02 AM   #15
73, Dark Blue 454
CF Senior Member
 
Member Since: Mar 2005
Location: Austin TX
Default

I'll dissent. I think the XE line is poorly designed. First, with good heads and good exhaust, dual pattern will cost you ponies. Here's some good reading:

http://www.camaros.net/forums/showth...hlight=cabbage

Secondly, many XE cams fail on start up. The ramps are too aggressive for a flat tap cam. And many of those that do survive start up, report too much noise (noise = friction,..slapping valves, etc). Go to www.chevelles.com and www.camaros.net and do a search, "noisy XE cam". You'll get a 156 hits on the Chevelles page and 115 on the Camaros page...(what would we do without the internet?...believe the marketing hype?)

I would stick to the 270H or up to a 280H. Or better yet, go roller.

Lastly, how a cam would sound should be a distant concern for the street or heck at the track. It would be easy to pick a great "sounding" idling cam that ran very poorly when things got serious.
73, Dark Blue 454 is offline   Reply With Quote
Old 08-08-2007, 01:00 AM   #16
Little Mouse
CF Senior Member
 
Member Since: Apr 2006
Default

I would like to know why more people seem to flock to comp cams ??
Little Mouse is offline   Reply With Quote
Old 08-08-2007, 06:47 AM   #17
Edzred72
CF Senior Member
 
Edzred72's Avatar
 
Member Since: Oct 2001
Location: Wildwood IL
Default

Quote:
Originally Posted by Little Mouse View Post
I would like to know why more people seem to flock to comp cams ??
Yeah...me too. Me thinks it's advertising & sponsorship. Their name is splashed all over the racing/high-performance industry.
For my 406 build....I choose POWER BY CROWER.
Eddie
Edzred72 is offline   Reply With Quote
Old 08-08-2007, 08:21 PM   #18
Tim H
CF Senior Member
 
Tim H's Avatar
 
Member Since: Oct 2000
Location: Southern Indiana
Default

Quote:
Originally Posted by Little Mouse View Post
I would like to know why more people seem to flock to comp cams ??
They have a good web site that puts the cam numbers big in your face , unlike Crane.
And yes sound is important, if not then I would stick with factory and run 150 shot of NOs.
Tim H is offline   Reply With Quote
Old 08-10-2007, 02:35 PM   #19
gmans71
Junior Member
 
gmans71's Avatar
 
Member Since: May 2007
Location: villa park il
Default

what about the new comp cams thumper hyd roller cams they sound killer!!!
gmans71 is offline   Reply With Quote
Old 08-10-2007, 04:16 PM   #20
Little Mouse
CF Senior Member
 
Member Since: Apr 2006
Default

Quote:
Originally Posted by Tim H View Post
They have a good web site that puts the cam numbers big in your face , unlike Crane.
And yes sound is important, if not then I would stick with factory and run 150 shot of NOs.
Here is a cam I looked at on cranes web site, just one I looked at
random, no reason for picking it.
Part #110591
grind# H-22813200-25-6
1957 to 1987, chevy
262-400 cu
description
performance usage, good mid range torque and HP,
bracket racing, street, heavy, ect., auto trans
W/3000 converter, 10.0 to 11.5 compression ratio
advised, basic RPM 2800-6200
valve settings, hot, intake .000
exhaust .000
lift at the cam lobe, intake 3200
exhaust 3294
valve lift intake 480
exhaust 494
rocker arm ratio 1.50
LSA 106

cam timing at .040 tappit
opens, intake 36 BTDC
exhaust 71 BBDC
closes, intake 68 ABDC
exhaust 39 ATDC
advertised duration, intake 284
exhaust 290

Cam Timing at .050 tappit
opens, intake, 12 BTDC
Exhaust, 47 BBDc
closes, intake, 36 ABDC
exhaust, 7 ATDC
Duration intake .050 228
exhaust .050 234
recomended RPM range, with matching components
2800
6400
7000 valve float

Spring requirements
part # 96802
closed 107 lbs at 1.800 or 1 13/16 height
open 289 lbs at 1.330

All this is at one place for this cam on cranes web site. Crane has the
opening and closing for you at both .040 tappit and .050 tappit, now if the
other cam companies have more info, my hats off to them, buy there cam.

Last edited by Little Mouse; 08-10-2007 at 06:31 PM.
Little Mouse is offline   Reply With Quote
Old 08-10-2007, 04:16 PM
 
Go Back   Corvette Forum > C3 Corvettes, 1968 - 1982 > C3 Tech/Performance
Reload this Page Comp Cams- CS EX274H-10 extreme series.
 
 
 
Reply

Tags
276284, aggressive, brakes, cam, cams, comp, ex274h, good, hp, lopey, lunati, performance, power, sound, xe274h


Thread Tools Search this Thread
Search this Thread:

Click for Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -4. The time now is 08:13 PM.


Emails & Password Backup

Search Engine Friendly URLs by vBSEO 3.5.2