Experience with Comp Cam 274 grind
Le Mans Master
Joined: Jan 2006
Posts: 8,319
Likes: 7
From: Wilmington DE, Drive it like you stole it, 68 327 4 speed coupe
Originally Posted by MasterDave
I had one in my sbc and generally liked it. I've tried many cams (see sig for engine) though and even though the XE274 was alright, I personally found a cam that is way better, at least for me. I highly recommend the Isky 270/280-12 MegaCam (Hyd). It still rumps and bumps at idle but cleans out immediately when revving/taking off. Not so with the XE274. Useable rpm's dropped from 1800 to 1200 with the Isky and it will still rev happily over 6000 with power to around that as well. Vacuum with the Comp was around 9 and with the Isky I get 11. You'll know the engine is 'cammed' with either one for sure. 
What are the specs on that cam ?
Melting Slicks
Joined: Apr 2000
Posts: 2,145
Likes: 1
From: Ft. Walton Beach, Fl USA
Originally Posted by sweethence
What are the specs on that cam ?
221/232 @ .050, .490/.517 lift (w 1.6 rockers) IVO -1.5 IVC 42.5 EVO 48 EVC 4. 2.5 degrees of overlap.
You can get the same cam in 106LS and 110LS also. It doesn't have 4 degrees advance ground in like most others.
The "seat" specs are: 270/280, IVO-23 IVC-67 EVO-72 EVC-28. 51 degrees of overlap.
I have my idle set at 900 and the vacuum is 13. My mileage in mixed driving is about 12.5mpg which is about 2mpg less than the XE262 I had before.
Last edited by nastee383; Mar 7, 2006 at 11:58 AM.
Safety Car
Joined: Jul 2002
Posts: 3,770
Likes: 3
From: St Louis MO
Originally Posted by sweethence
What are the specs on that cam ?
Lift - 568 i 578 e
Adv dur - 274 i 280 e
.050 dur - 236 i 242 e
lsa 110
Next time I swap the cam or when I rebuild it, I'll go a tad bigger on the cam...
Brett
Thread Starter
Melting Slicks
Joined: Mar 2004
Posts: 3,472
Likes: 18
From: Lake Ozark, MO
Went ahead and ordered the package XE 274. Now everything is matched. For $328.00 - price included the cam, lifters, matched springs, retainers, locks, timing chain/gears, lube and the new P-rods.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Next ... have an EXPERT rebuild your heads with those new parts ... remember, you have at least one valve with mushroomed tip ... heads may need guides etc ... have an EXPERT do it & you pay for what you get.
Originally Posted by Hvymtlc5
Went ahead and ordered the package XE 274. Now everything is matched. For $328.00 - price included the cam, lifters, matched springs, retainers, locks, timing chain/gears, lube and the new P-rods.
Thread Starter
Melting Slicks
Joined: Mar 2004
Posts: 3,472
Likes: 18
From: Lake Ozark, MO
yep expert setup (just like last time). New machine shop said none of the valves were setup for the same height...going to tear it all down, another valve job, and go from there. Just hope the comp cam will survive breakin.......
Le Mans Master
Joined: Jan 2006
Posts: 8,319
Likes: 7
From: Wilmington DE, Drive it like you stole it, 68 327 4 speed coupe
Originally Posted by Brettmc
It just happens that I have the cam card in my wallet. Does that qualify me as a motorhead?
Lift - 568 i 578 e
Adv dur - 274 i 280 e
.050 dur - 236 i 242 e
lsa 110
Next time I swap the cam or when I rebuild it, I'll go a tad bigger on the cam...
Brett
Lift - 568 i 578 e
Adv dur - 274 i 280 e
.050 dur - 236 i 242 e
lsa 110
Next time I swap the cam or when I rebuild it, I'll go a tad bigger on the cam...
Brett
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Order this cam lube for cam breakin: Crane Super Moly Lube P/N 99004-1 in a tub or 99002-1 in 2 small squeeze packs ... slather it on all lobes & all lifter faces & all pushrod tips & all stamped rocker fulcrums ... it's a molybdenum disulfide grease ... I use same thing ... No probs w/cam breakin.
Originally Posted by Hvymtlc5
yep expert setup (just like last time). New machine shop said none of the valves were setup for the same height...going to tear it all down, another valve job, and go from there. Just hope the comp cam will survive breakin.......
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