Comp Cams- CS EX274H-10 extreme series.
08-11-2007, 12:45 AM
#22
12.14 w/ the original 327
It doesn't take a lot of cam to run fast. Our 62 went 13.2 @ 106 uncorrected at LACR (12.88 @ 109, if you believe in altitude correction factors) with the 1962 327 block and 461 heads, a reground cam with .520" I/E (using a 1.6 rocker), 236* I/E @ .050", 284* I/E, on a 112* LS, Weiand dual plane intake, 11" Holeshot converter, a stock TH350 (left in D, no shift kit), 3.70 Posi, 235/70/R15 Radial T/As.
The car idles like a stocker and the 2 1/2" exhaust is actually quieter than the stock 2.00" pipes.
The lo po factory heads and $50 re-grind has put a few rather expensive combos to shame. The engine had less than 100 miles on it when we ran those times on 7-29-07 in 95*+ heat. Hope to take it to a sea level track this fall after the temperatures drop and try to get a decent ET out of it.
The car idles like a stocker and the 2 1/2" exhaust is actually quieter than the stock 2.00" pipes.
The lo po factory heads and $50 re-grind has put a few rather expensive combos to shame. The engine had less than 100 miles on it when we ran those times on 7-29-07 in 95*+ heat. Hope to take it to a sea level track this fall after the temperatures drop and try to get a decent ET out of it.
08-11-2007, 08:28 AM
#23
Safety Car
Thread Starter
But for some, sound is everything.
If I don't want a lope and all the goddies, I might as well buy a new Chrysler 300 and cruise in style!
I love when people tell you what you don't need, but look at their car and it looks and sounds like a Summit catolog!!!!!
If I don't want a lope and all the goddies, I might as well buy a new Chrysler 300 and cruise in style!
I love when people tell you what you don't need, but look at their car and it looks and sounds like a Summit catolog!!!!!
08-11-2007, 10:28 AM
#24
Team Owner
08-11-2007, 10:46 PM
#25
08-12-2007, 01:58 AM
#26
Advanced
Member Since: Jun 2001
Location: New Berlin Wisconsin USA
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Comp XE 274 Is a great cam, I have installed it in a 406, 327,427, and my 355, ALL sound GREAT, no hassle with break in if you set up valve geometry correct, use proper break in procedures, Quiet, and as ALL FLAT TAPPET CAMSHAFTS require, ZINC PHOSPHATE-. Forget about the vacuum advance distributors, as disconnecting the advance module does more harm than good, by placing the rotor out of phase with the cap terminals. Just take an old cap, drill a 1" whole between any two terminals, clamp your timming inductive pick up on the leading plug wire, and watch the misalighnment as RPMs change. There is an article in one of the mags about this cam in camparrison to the GM 151 327 350 HP Cam. One last thing, I firmly believe comprehensive engine top end planning and orchestration is key to success.
08-12-2007, 08:53 AM
#27
Le Mans Master
a crappy looking car with a great sound will get my attention. A great looking car will get my attention,but if it sounds smooth and gentle,its a bit of a disappointment. I suppose my "preferances" come from my early days in the hobby, when sometimes folks would pull out their chokes to get a choppy idle. (lol) I still love the sound of a nice hot cam.
08-13-2007, 06:17 AM
#29
Race Director
We were at a large Corvette Show in Orlando in January, a majority of the cars on display were C5/C6s:
a chrome-bumper C3, with big-block hood, sidepipes and a nasty idle pulled-in, and all jaws dropped.....
You'd have thought it was John Force, warming-up his car in the pits.
08-13-2007, 03:57 PM
#30
Instructor
Member Since: Feb 2007
Location: South of GR MI
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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?)
This was before the zinc issue was well known. I use Rotella oil now and hope for the best.
Swapping cams is a PITA, so I don't do it for fun to see what makes more power. My 406 with untouched Dart Ironeagle 200s went 12.20 in a 3000lb S10 though 2.25" pipes so the cam does work. That's why I replaced with the same.
08-14-2007, 11:18 PM
#31
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I wanted to add that, all motors I equiped with this grind were between 10:00-10.25 true measured (cc) compression, headers, pocket porting, and dual plane intakes. Also absolutly no problem with power brakes-(A HUGE PLUS) with a grind of this nature. The profile of this cam is agressive as compared to the grandma's bone stock 305, though can't even get close to serious grinds. I run a flat tappet solid in my 10:51 second 72 Gran Sport (Buick), THATS BRUTAL ramping, NO WIPED-OUT lobes, over 50 passes, set-um up right and have some fun.
08-15-2007, 05:34 AM
#32
I have this non roller cam in my 383 and it is as lopey as I would want. Holds good vacuum and idles easily at 700-800. Sets off alarms pretty regularly with dynomax mufflers and an X-pipe cross over.
I would recommend it for a 383.
btw, I am using 1.6:1 rocker arms.
I would recommend it for a 383.
btw, I am using 1.6:1 rocker arms.
08-15-2007, 10:01 AM
#33
Safety Car
Thread Starter
I think the holy grail of cams is the Comp Cams magnum cams.
Out of the 4 choices, one should fit everybodies needs.
I see they dropped the 490/280. I bet that was a street beast!
Out of the 4 choices, one should fit everybodies needs.
I see they dropped the 490/280. I bet that was a street beast!
08-15-2007, 01:20 PM
#34
Burning Brakes
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.
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.
I had that cam in my 70 sbc and it sounded good and ran great.
08-15-2007, 03:32 PM
#35
Safety Car
Thread Starter
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.
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.
Crane has a bad habit of listing operating ranges higher than other cams with the same specs.
Anyway I like a page with all the cams on one pages verses having to pick thru one at a time
6 steps to get here: http://www.cranecams.com/index.php?s...262-400%20C.I.
2 steps:http://www.compcams.com/technical/Ca...67_226-227.pdf
Last edited by Tim H; 08-15-2007 at 03:35 PM.
08-25-2007, 02:09 AM
#36
Pro
I am having my short block redone, but with that cam, and AFR195 heads airgap intake 10.5.1 comp.. the tires would squeal less than half throttle, at 2500rpm in first I would nail it the car would go sideways, awsome cam, with the proper engine combo...
now I am having 6inch forged rods and low friction forged pistons installed and a comp extreme roller cam installed 236/240dur 550/575lift
