Found my Cam Problem in the Big Block - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1970 CST Short Wide** · 09-07-2005, 03:38 PM

When I built my 454 I used a Comp Cam #11-207-3 this is a 270 duration cam with a 510 lift. It sounded like a solid lifter cam that was out of adjustment. I called Comp and told them my problem and they sold me another cam (same #) at cost and said to see if that fixed it. It DID NOT FIX IT, It still sounded nasty. After putting out $350 to have my lifter bores reconditioned and trying it again I Still had the same problem. I mean this thing was loud and nasty. A local machine shop said that they used that same cam and had the same problem in a few Big Blocks that they built. They said to use Comp Cam #11-242-3 a split duration 268 / 280 Cam with a 520 lift. The noise is gone and the performance is Sweeeet.

I called Comp and told them of my problem and that I wasnâ€™t very happy after changing out the cam 3 times.

I'm waiting on there answer and will keep you all informed IF they call back

neonlarry · 09-07-2005, 06:23 PM

And a lot of people say call the cam company and ask for their reccomendation. RIGHT!

steve_kibbe · 09-07-2005, 10:27 PM

should have gone crane.............

Hope they make it right

**Green Machine** · 09-07-2005, 11:38 PM

I think the magnum series was one of their earlier versions of more aggressive high lift cams, the xtreme series is newer and maybe more refined, I've run a comp and crane in my sbc with similar numbers, they both make noise, guess thats why the stockers have such long ramps, but yours must have been really bad, my next cam will probaly be a crane, not comp, machist told me of trouble comp had a few years back with base circle runout and quality control issues, as they farm out the grinding to some other companies, not sure if they do all there own now or not - just my 2 cents.

arkracing · 09-08-2005, 07:05 AM

How does the new cam sound as far as "lopeyness" is it nice or barely noticable?

I know it takes alot to make a big block shake...so i was curious as i have that cam in my 396 (that i haven't even started yet)

**1970 CST Short Wide** · 09-08-2005, 10:04 AM

It has a fair lope to it. I like it, but thats what I wanted. It comes on very strong on low end and holds though 5000 RPM

**1970 CST Short Wide** · 09-08-2005, 12:29 PM

Comp just called to make sure warrantee guy had called. When I said he had NOT he asked me to send all my receipts to them. So I sent the $763.02 in receipts and we'll see what happens.

xtremer-pxl · 09-08-2005, 01:40 PM

that would be cool if they picked up the bill.

09-07-2005, 06:23 PM	#2
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	And a lot of people say call the cam company and ask for their reccomendation. RIGHT! __________________ 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

09-07-2005, 11:38 PM	#4
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	I think the magnum series was one of their earlier versions of more aggressive high lift cams, the xtreme series is newer and maybe more refined, I've run a comp and crane in my sbc with similar numbers, they both make noise, guess thats why the stockers have such long ramps, but yours must have been really bad, my next cam will probaly be a crane, not comp, machist told me of trouble comp had a few years back with base circle runout and quality control issues, as they farm out the grinding to some other companies, not sure if they do all there own now or not - just my 2 cents. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

09-08-2005, 07:05 AM	#5
arkracing Weekend Warrior Join Date: Oct 2004 Location: CT Posts: 1,787	How does the new cam sound as far as "lopeyness" is it nice or barely noticable? I know it takes alot to make a big block shake...so i was curious as i have that cam in my 396 (that i haven't even started yet) __________________ -'07 GMC Sierra K2500HD -'66 C10 Suburban -'68/'71 K20 Service Bed Project -'69 Chevy C30 Mason Dump -'33Ford P/U 396ChevyPowered

09-08-2005, 10:04 AM	#6
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,140	It has a fair lope to it. I like it, but thats what I wanted. It comes on very strong on low end and holds though 5000 RPM __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

09-08-2005, 12:29 PM	#7
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,140	Comp just called to make sure warrantee guy had called. When I said he had NOT he asked me to send all my receipts to them. So I sent the $763.02 in receipts and we'll see what happens. __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 Last edited by 1970 CST Short Wide; 09-08-2005 at 04:39 PM.

09-07-2005, 03:38 PM	#1
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,140	Found my Cam Problem in the Big Block When I built my 454 I used a Comp Cam #11-207-3 this is a 270 duration cam with a 510 lift. It sounded like a solid lifter cam that was out of adjustment. I called Comp and told them my problem and they sold me another cam (same #) at cost and said to see if that fixed it. It DID NOT FIX IT, It still sounded nasty. After putting out $350 to have my lifter bores reconditioned and trying it again I Still had the same problem. I mean this thing was loud and nasty. A local machine shop said that they used that same cam and had the same problem in a few Big Blocks that they built. They said to use Comp Cam #11-242-3 a split duration 268 / 280 Cam with a 520 lift. The noise is gone and the performance is Sweeeet. I called Comp and told them of my problem and that I wasnâ€™t very happy after changing out the cam 3 times. I'm waiting on there answer and will keep you all informed IF they call back __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

09-07-2005, 10:27 PM	#3
steve_kibbe Registered User Join Date: Jul 2005 Location: South Carolina Posts: 49	should have gone crane............. Hope they make it right

09-08-2005, 01:40 PM	#8
xtremer-pxl Registered User Join Date: Jun 2005 Location: Arkansas City, Kansas Posts: 44	that would be cool if they picked up the bill. __________________ WANTED 2dr 4x4 fullsize blazer, yukon, tahoe South Central Kansas Member

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