Cam selection - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hotrod70C10 · 03-05-2003, 02:17 AM

The time has come! I've got a set of 350 vortec's from a 99 subarban. I'm picking up an edelbrock performer intake for the vortec's along with a edelbrock 1406 electric choke carb. After talking to my uncle that owned my truck before me, I learned that the bottom end has roughly 40k on it. It's .030 over but he couldn't remember if he put flat tops in it or not. Since there is no blowby or any signs of problems i'm going to go ahead and put the heads intake and carb on this shortblock. I've got my eyes set on two different camshafts from comp cams
the 268H and the 270H. I am pretty sure that i have 3.07 rear gears but will be checking this weekend while i'm serviceing the tranny and rearend along with installing trailing arm and panhard bar bushings. Ok well back to my question what do you guys think of the 268H and 270H?? Thanks in advance!

Project1970 · 03-05-2003, 03:06 AM

Power-wise, from what I can see, you can't really beat an XE-series cam like the XE262 or XE268...the 268 is really close to the Vortec's unmodded lift limit, though.

Some people say, though, that you're looking at longevity issues with an XE series cam...apparently they're right at the limit of what you can do with a flat tappet hydraulic cam.

70c10 · 03-05-2003, 09:02 AM

I just put a XE262 in my truck 2 weeks ago and have not even had a chance to try it but I think I will be happy once I get it set up. I would post this question over in the engine forum for more responses!. Lots of knowledgable guys over there for input.

greasemonkey · 03-05-2003, 09:56 AM

My uncle, a car nut, hates comp cams. He says they were made to fool NHRA rules, that they slam the valves open fast. He says stick with a good Vette cam. And believe me, he would know.

greasemonkey · 03-05-2003, 09:57 AM

Oh and he used to have a '69 that he built a 383 stroker for that ran in the low 13's.

OregonLonghorn · 03-06-2003, 01:14 AM

get in touch with Edelbrocks tech line and see what cam they match with their intake and carb. I run a matched set from them in my 402 and am really happy with it.

Hotrod70C10 · 03-06-2003, 02:20 AM

Thanks guys

Mike C · 03-07-2003, 11:28 AM

GM performance cams are antiqauted designs from the 1960's. Almost any aftermarket cam of compareable size will make much better power. For the street, I really like enegizer cams. 266 for a mostly stock motor, or a 272 for about 5000 rpm or a 278 for 5500-6000. The 284 is a POS IME. Stay away from anything over 110 LSA (most GM cams) unless you have FI using a non-programmable computer or a motor below 300 ci.

neonlarry · 03-07-2003, 12:26 PM

what about crower cams? I haven't heard of many people using them, but the specs look simalar to some of the crane cams. Is there anyone here that has a lot of miles on a XE cam? I have heard from a lot of people that they probably won't last too long, but has anyone have one that has put enough miles on it to wear it out?

Hotrod70C10 · 03-07-2003, 08:31 PM

Well.....I think i've decided on my cam for the price you can't beat a Summit cam & lifter set (under $80) I'm looking at Summit's
SUM-K1103. I've decided to not go with a XE series because of the reliability issues. So what do you guys think of the SUM-K1103? Sorry to be a pest!

03-05-2003, 02:17 AM	#1
Hotrod70C10 Low & Slow Join Date: Dec 2002 Location: Oklahoma Posts: 1,047	Cam selection The time has come! I've got a set of 350 vortec's from a 99 subarban. I'm picking up an edelbrock performer intake for the vortec's along with a edelbrock 1406 electric choke carb. After talking to my uncle that owned my truck before me, I learned that the bottom end has roughly 40k on it. It's .030 over but he couldn't remember if he put flat tops in it or not. Since there is no blowby or any signs of problems i'm going to go ahead and put the heads intake and carb on this shortblock. I've got my eyes set on two different camshafts from comp cams the 268H and the 270H. I am pretty sure that i have 3.07 rear gears but will be checking this weekend while i'm serviceing the tranny and rearend along with installing trailing arm and panhard bar bushings. Ok well back to my question what do you guys think of the 268H and 270H?? Thanks in advance! __________________ 70' C-10 LWB Fleetside 4.5/6 drop

03-05-2003, 03:06 AM	#2
Project1970 14.1 @ 96MPH Join Date: Jul 2001 Location: Mesa, AZ Posts: 2,811	Power-wise, from what I can see, you can't really beat an XE-series cam like the XE262 or XE268...the 268 is really close to the Vortec's unmodded lift limit, though. Some people say, though, that you're looking at longevity issues with an XE series cam...apparently they're right at the limit of what you can do with a flat tappet hydraulic cam. __________________ Project1970 - LS1 Swap Complete!

03-05-2003, 09:02 AM	#3
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	I just put a XE262 in my truck 2 weeks ago and have not even had a chance to try it but I think I will be happy once I get it set up. I would post this question over in the engine forum for more responses!. Lots of knowledgable guys over there for input. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

03-05-2003, 09:56 AM	#4
greasemonkey Registered User Join Date: Dec 2001 Location: Pace, FL Posts: 2,155	My uncle, a car nut, hates comp cams. He says they were made to fool NHRA rules, that they slam the valves open fast. He says stick with a good Vette cam. And believe me, he would know. __________________ 1942 Master Deluxe 1969 C/10 1985 Blazer CUCV 1987 Jimmy 2004 Tahoe 2005 Silverado 1500 2005 Silverado 3500

03-05-2003, 09:57 AM	#5
greasemonkey Registered User Join Date: Dec 2001 Location: Pace, FL Posts: 2,155	Oh and he used to have a '69 that he built a 383 stroker for that ran in the low 13's. __________________ 1942 Master Deluxe 1969 C/10 1985 Blazer CUCV 1987 Jimmy 2004 Tahoe 2005 Silverado 1500 2005 Silverado 3500

03-06-2003, 01:14 AM	#6
OregonLonghorn Registered User Join Date: Feb 2003 Location: Myrtle Creek, Oregon Posts: 29	get in touch with Edelbrocks tech line and see what cam they match with their intake and carb. I run a matched set from them in my 402 and am really happy with it.

03-06-2003, 02:20 AM	#7
Hotrod70C10 Low & Slow Join Date: Dec 2002 Location: Oklahoma Posts: 1,047	Thanks guys __________________ 70' C-10 LWB Fleetside 4.5/6 drop

03-07-2003, 11:28 AM	#8
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,727	GM performance cams are antiqauted designs from the 1960's. Almost any aftermarket cam of compareable size will make much better power. For the street, I really like enegizer cams. 266 for a mostly stock motor, or a 272 for about 5000 rpm or a 278 for 5500-6000. The 284 is a POS IME. Stay away from anything over 110 LSA (most GM cams) unless you have FI using a non-programmable computer or a motor below 300 ci. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

03-07-2003, 12:26 PM	#9
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,745	what about crower cams? I haven't heard of many people using them, but the specs look simalar to some of the crane cams. Is there anyone here that has a lot of miles on a XE cam? I have heard from a lot of people that they probably won't last too long, but has anyone have one that has put enough miles on it to wear it out? __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

03-07-2003, 08:31 PM	#10
Hotrod70C10 Low & Slow Join Date: Dec 2002 Location: Oklahoma Posts: 1,047	Well.....I think i've decided on my cam for the price you can't beat a Summit cam & lifter set (under $80) I'm looking at Summit's SUM-K1103. I've decided to not go with a XE series because of the reliability issues. So what do you guys think of the SUM-K1103? Sorry to be a pest! __________________ 70' C-10 LWB Fleetside 4.5/6 drop



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