Another cam question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jackedup · 01-30-2015, 12:00 AM

So I finally got my first ride and now I've got to get her runnin right. Not sure what my engine specs are, all I can tell you is that it's a 2 owner 100% stock 71 c10 lwb with a 350 with 4 barrel carb, automatic trans and dual exhaust. Stock heads, intake, etc. I have found the reason it runs rough and is sluggish is due to flat spots in the cam. I'm looking at this as a opportunity to upgrade the cam with one that has improved low and midrange torque without killing it on the highway as it will be driven regularly. Wanting a cam that "matches" everything else stock on my engine. I'm interested in this cam generically referred to as a "RV" cam. Been looking at the edelbrock performer plus and the summit racing sum -1102. Any suggestions or words of wisdom are appreciated.

**Ironangel** · 01-30-2015, 12:16 AM

This is what was suggested to me last year at this time https://www.lunatipower.com/Product....d=2323&gid=287 I have since installed the cam and have no complaints. I installed it in a stock 4bbl 350 with a 350 turbo hydramatic LWB C-10 with now a 3:73 12-bolt posi...I use this truck to tow a 20' foot trailer loaded with another 72 C-10 LWB. I havent had any trouble with that cam. It does what it was advertised to do, make power from 0-5000 rpm... Welcome to the board!

18436572GMC · 01-30-2015, 03:45 AM

Summit 1102
works with stock converter
works with stock valvetrain
and it is cheap so go for it.

On a side note run an oil with a higher zddp content such as a 15w40 diesel oil. It will protect your new cam.

mechanicalman · 01-30-2015, 04:33 AM

Quote:

Originally Posted by jackedup

So I finally got my first ride and now I've got to get her runnin right. Not sure what my engine specs are, all I can tell you is that it's a 2 owner 100% stock 71 c10 lwb with a 350 with 4 barrel carb, automatic trans and dual exhaust. Stock heads, intake, etc. I have found the reason it runs rough and is sluggish is due to flat spots in the cam. I'm looking at this as a opportunity to upgrade the cam with one that has improved low and midrange torque without killing it on the highway as it will be driven regularly. Wanting a cam that "matches" everything else stock on my engine. I'm interested in this cam generically referred to as a "RV" cam. Been looking at the edelbrock performer plus and the summit racing sum -1102. Any suggestions or words of wisdom are appreciated.

C10 350ci automatic trans I'm thinking you probably have a 307:1 rear? Also not sure how many miles you have on it.

Summit 1102 would be good, I'd use Delphi lifters on any cam I bought.
http://www.ebay.com/itm/SBC-DELPHI-L...662d12&vxp=mtr

Or this lunati is one step down from ironangel's recommendation, I really like both cams and recommend them.
http://www.summitracing.com/parts/lu...make/chevrolet

Whatever you do if your engine is a high miler replace those valve springs and seals while you have it out. I prefer umbrella seals but to each his own.
http://www.competitionproducts.com/H.../#.VMtAdU10wu4
http://www.competitionproducts.com/V.../#.VMtAtE10wu4

You don't want to go crazy on valvesprings with these cams we have recommended. Too much spring can complicate cam break-in, and the stock rocker studs can pull out.

Don't forget, use break-in oil run the engine around 2,000 RPM for about 20 minutes to break in the camshaft. ALSO, break in the new springs. Engine MUST completely warm up once and completely cool off for the springs to take a set. If you rev it up after breaking in the cam without letting it cool off overnight, the springs will become weak and prone to failure.

**Already Gone** · 01-30-2015, 09:02 AM

Subscribed

Mike C · 01-30-2015, 10:44 AM

The .050 duration of the cam in my experience is the best tool to use for determining the appropriate cam.

In a mostly stock motor I would try and keep the .050 duration at 212 degrees or less. The exhaust number doesn't matter so much. I am not a split pattern cam guy for SBC, it has good exhaust ports and with 'vette manifolds and 2 1/2" exhaust that most run on the street, it just doesn't need it. Small blocks need intake help.

The old Crane Energizer 266 is one of my favorite cams. It compares to the Comp High Energy 260 at .050 numbers. But the 272 or the Comp 268 are also good torque cams.

**WIDESIDE72** · 01-31-2015, 08:49 PM

Comp cams 268h
http://www.ebay.com/itm/Competition-...dcda46&vxp=mtr

**WIDESIDE72** · 01-31-2015, 09:06 PM

Lifters
http://www.ebay.com/itm/SBC-BBC-283-...57f4d3&vxp=mtr

hamjet · 02-01-2015, 07:18 AM

Quote:

Originally Posted by WIDESIDE72

Lifters
http://www.ebay.com/itm/SBC-BBC-283-...57f4d3&vxp=mtr

X2, Good lifters, I just bought them...

**WIDESIDE72** · 01-31-2015, 09:09 PM

Or these
http://www.ebay.com/itm/16-New-Seale...26a436&vxp=mtr

**WIDESIDE72** · 01-31-2015, 09:12 PM

Also, I use brad Penn oil in my flat tablet engines. Diesel oil is a close second. I have used local parts store oil like castrol gasoline etc along with a zddp additive.

The biggest key is break in, just as before, but now you need to buy a specific break in oil..
I ha rushed comp cams break in oil lately.

01-30-2015, 12:00 AM	#1
jackedup Registered User Join Date: Jan 2015 Location: OKLAHOMA CITY Posts: 29	Another cam question So I finally got my first ride and now I've got to get her runnin right. Not sure what my engine specs are, all I can tell you is that it's a 2 owner 100% stock 71 c10 lwb with a 350 with 4 barrel carb, automatic trans and dual exhaust. Stock heads, intake, etc. I have found the reason it runs rough and is sluggish is due to flat spots in the cam. I'm looking at this as a opportunity to upgrade the cam with one that has improved low and midrange torque without killing it on the highway as it will be driven regularly. Wanting a cam that "matches" everything else stock on my engine. I'm interested in this cam generically referred to as a "RV" cam. Been looking at the edelbrock performer plus and the summit racing sum -1102. Any suggestions or words of wisdom are appreciated.

01-30-2015, 12:16 AM	#2
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: Another cam question This is what was suggested to me last year at this time https://www.lunatipower.com/Product....d=2323&gid=287 I have since installed the cam and have no complaints. I installed it in a stock 4bbl 350 with a 350 turbo hydramatic LWB C-10 with now a 3:73 12-bolt posi...I use this truck to tow a 20' foot trailer loaded with another 72 C-10 LWB. I havent had any trouble with that cam. It does what it was advertised to do, make power from 0-5000 rpm... Welcome to the board! __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"

01-30-2015, 03:45 AM	#3
18436572GMC Registered User Join Date: Sep 2013 Location: iredell county, nc Posts: 77	Re: Another cam question Summit 1102 works with stock converter works with stock valvetrain and it is cheap so go for it. On a side note run an oil with a higher zddp content such as a 15w40 diesel oil. It will protect your new cam. __________________ Real trucks have a clutch. Please inform automakers. 1972 GMC, K25, 383 stroker, SM465, NP205, Eaton HO-72

01-30-2015, 09:02 AM	#5
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,143	Re: Another cam question Subscribed __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

01-30-2015, 10:44 AM	#6
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,727	Re: Another cam question The .050 duration of the cam in my experience is the best tool to use for determining the appropriate cam. In a mostly stock motor I would try and keep the .050 duration at 212 degrees or less. The exhaust number doesn't matter so much. I am not a split pattern cam guy for SBC, it has good exhaust ports and with 'vette manifolds and 2 1/2" exhaust that most run on the street, it just doesn't need it. Small blocks need intake help. The old Crane Energizer 266 is one of my favorite cams. It compares to the Comp High Energy 260 at .050 numbers. But the 272 or the Comp 268 are also good torque cams. __________________ 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

01-31-2015, 08:49 PM	#7
WIDESIDE72 Senior Member Join Date: Aug 2008 Location: Cedar Park, Texas Posts: 7,500	Re: Another cam question Comp cams 268h http://www.ebay.com/itm/Competition-...dcda46&vxp=mtr

01-31-2015, 09:06 PM	#8
WIDESIDE72 Senior Member Join Date: Aug 2008 Location: Cedar Park, Texas Posts: 7,500	Re: Another cam question Lifters http://www.ebay.com/itm/SBC-BBC-283-...57f4d3&vxp=mtr

01-31-2015, 09:09 PM	#10
WIDESIDE72 Senior Member Join Date: Aug 2008 Location: Cedar Park, Texas Posts: 7,500	Re: Another cam question Or these http://www.ebay.com/itm/16-New-Seale...26a436&vxp=mtr

01-31-2015, 09:12 PM	#11
WIDESIDE72 Senior Member Join Date: Aug 2008 Location: Cedar Park, Texas Posts: 7,500	Re: Another cam question Also, I use brad Penn oil in my flat tablet engines. Diesel oil is a close second. I have used local parts store oil like castrol gasoline etc along with a zddp additive. The biggest key is break in, just as before, but now you need to buy a specific break in oil.. I ha rushed comp cams break in oil lately.



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