Cam suggestions? - Chevelle Tech

Performance Our High Performance area

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 87 (permalink) Old Mar 16th, 10, 9:35 PM Thread Starter
Lifetime Premium Member
Phil
 
Join Date: Jan 2006
Location: Lorain, OH
Posts: 2,977
Cam suggestions?

I'm sure I'll get some flak for saying this, but I'd like to go with a budget cam and lifter kit for my application. Something like a Summit, Elgin, or Howard's cam kit. If one of those won't work well, then I'm open to other suggestions.

My setup...

This is for an 81 Camaro.
sbc 350
Vortec heads (milled .045)
9.8 to 1 compression
Performer RPM intake
600 Eddy carb, but probably going to swap out for a Holley 670
th350 trans
Would like to keep converter stall around/below 2400rpm
3:23 rear end

Car will be strictly street use, so prefer the powerband to be in the low to mid range rpms. Won't ever spin it past 5500 rpm.


I've been looking at the Elgin E1785PM (same as Summit K00172). Many say it's a clone of the Crane 274H06. What do you guys think?

71 Chevelle SS
zz502 (Straub Cam, RPM Airgap, ProSystems Carb, MSD, etc.)
Rossler TH400
Built 12 bolt 4:11


Pics
Video
Slick71ss is offline  
Sponsored Links
Advertisement
 
post #2 of 87 (permalink) Old Mar 16th, 10, 9:41 PM
Senior Tech Team
Eric
 
Join Date: May 2007
Location: USA
Posts: 1,810
Re: Cam suggestions?

Spend the extra 50 bucks and buy a Voodoo 262, trust me on this. You can use stock exhaust manifolds and convertor.You won't be sorry..

1966 Chevelle 300 Deluxe Post, 327cu AFR180CC Street Eliminator, Voodoo, Harland Sharp 1.6 RR, Weiand Stealth Airstrike, 650cfm avs, MSD 4spd 355 posi

http://i183.photobucket.com/albums/x...2/P1010428.jpg
http://i183.photobucket.com/albums/x...2/P1010429.jpg
66 BRONZE is offline  
post #3 of 87 (permalink) Old Mar 16th, 10, 9:59 PM
Tech Team
Blake
 
Join Date: Mar 2010
Location: Mid Missouri
Posts: 505
Re: Cam suggestions?

I noticed the summit cam kit SUM-K1102 has the exact duration and lift numbers as the edelbrock performer cam and the SUM-K1107 which is probably bigger than you want but is the same as the edelbrock rpm cam
692envy is offline  
post #4 of 87 (permalink) Old Mar 16th, 10, 10:12 PM
Team Member
Jake
 
Join Date: Nov 2007
Location: Louisiana
Posts: 7,536
Re: Cam suggestions?

Those are decent cams, but the vortecs will really wake up with a dual pattern cam. The voodoo line is decent. It has really steep intake ramps, and slow exhaust ramps. They are not the only split patterns out there, though. And they do have pretty wide LSA's.

I think you're right in the ballpark with your numbers, adv. duration, duration at .050". Unless those heads have been clearanced/machined for more lift, I think you need to stay around .450".

Bottom line...you need a split pattern, in the 262 to 274 range.

1972 Malibu Sport Coupe - Victory Red on Black - 350/TH350

I do all my own stunts.
Highway Star is offline  
post #5 of 87 (permalink) Old Mar 16th, 10, 10:29 PM Thread Starter
Lifetime Premium Member
Phil
 
Join Date: Jan 2006
Location: Lorain, OH
Posts: 2,977
Re: Cam suggestions?

I can go higher on the lift if need be. I'm safe up to .525

I'm gonna go looking through more cam specs right now.

71 Chevelle SS
zz502 (Straub Cam, RPM Airgap, ProSystems Carb, MSD, etc.)
Rossler TH400
Built 12 bolt 4:11


Pics
Video
Slick71ss is offline  
post #6 of 87 (permalink) Old Mar 16th, 10, 11:33 PM
Team Member
Jake
 
Join Date: Nov 2007
Location: Louisiana
Posts: 7,536
Re: Cam suggestions?

I just found this Howard's cam...

#112021 1600-5800 High-lift, dual pattern. Needs 4 barrel, low gears and 2500+ stall

.468/.480
284/302 adv
220/230 @ .050"
110 LSA


That might be a little big, but I'll bet it makes some good power.

1972 Malibu Sport Coupe - Victory Red on Black - 350/TH350

I do all my own stunts.
Highway Star is offline  
post #7 of 87 (permalink) Old Mar 17th, 10, 8:59 AM
Tech Team
Adam
 
Join Date: Feb 2010
Location: St. Louis, MO
Posts: 211
Re: Cam suggestions?

If you're running headers and a decent exhaust you do NOT want a dual pattern cam. That cam you have picked is an excellent choice IMO. It'll fit your application perfectly. Be sure to have a good exhaust set up though, it makes a world of difference on a tight LSA cam.
ap72 is offline  
post #8 of 87 (permalink) Old Mar 17th, 10, 11:24 AM
Team Member
Jake
 
Join Date: Nov 2007
Location: Louisiana
Posts: 7,536
Re: Cam suggestions?

Please go read this, before making any decisions or giving any advice about single pattern vs. split pattern cams with vortec heads.

http://www.nastyz28.com/forum/showthread.php?t=56505

1972 Malibu Sport Coupe - Victory Red on Black - 350/TH350

I do all my own stunts.
Highway Star is offline  
post #9 of 87 (permalink) Old Mar 17th, 10, 11:33 AM
Tech Team
Adam
 
Join Date: Feb 2010
Location: St. Louis, MO
Posts: 211
Re: Cam suggestions?

Quote:
Originally Posted by Highway Star View Post
Please go read this, before making any decisions or giving any advice about single pattern vs. split pattern cams with vortec heads.

http://www.nastyz28.com/forum/showthread.php?t=56505

no. There is no reason to wade through those 50 pages of crap. Call up any good cam guy and tell him what you have and want. 4 out of 5 will spec a single pattern... Coincidence???

Again it requires a good exhaust setup, but for your parts and application a single pattern will serve you well.

**I just noticed you're good to .525" lift, I missed that part... Why don't you get a bigger cam if you can? I assumed you were using stock vortec which are restricted to .450".

Last edited by ap72; Mar 17th, 10 at 11:56 AM.
ap72 is offline  
post #10 of 87 (permalink) Old Mar 17th, 10, 11:59 AM
Tech Team
Chris
 
Join Date: Jan 2007
Location: oklahoma
Posts: 32
Re: Cam suggestions?

I have used the summit cam K1105 with great luck on stuff like this:

465/488
224/234
114 LS

sounds good, and very responsive....

Stock suspension 71 chevelle
1.19 60'
4.96 @ 142
http://i235.photobucket.com/albums/e...AKO_1121-1.jpg
505chevelle is offline  
post #11 of 87 (permalink) Old Mar 17th, 10, 12:05 PM
Team Member
Jake
 
Join Date: Nov 2007
Location: Louisiana
Posts: 7,536
Re: Cam suggestions?

This is from the GM guy (Gary Penn) in the thread at NastyZ28:

Quote:
Unported, with all the other tricks in place, the Vortecs will flow about 235-240 CFM at .500 I and 165-170 cfm at .500 E, on a 4" bore
Adding headers and mufflers doesn't change the amount of air the heads can move.

The cam guys I've talked with do not support your assertion about single pattern cams either.


Yeah, whatever you do, DON'T read that thread. You might actually get to learn what others have done...

Dirt Reynolds's car:

1
Quote:
977 Z28 Camaro - full-weight, all-steel, 3760-3775 lbs race-ready with driver.

Best ET: 12.15 @ 110.52 MPH on a very worn set of BFG 275/60 drag radials, launched off-idle, in the heat of July.

Highlight notes: Home-ported Vortecs with stock valves and stamped-steel rockers, hydraulic lifter cam, dual plane intake and vacuum secondary carb.

This engine was a budget build, since I had already spent a large portion of my original budget for this project purchasing the car as a rolling chassis:
  • #817 block 400, bored .060"-over for 412.7 ci. The block would not clean up at either .030" or .040" over, so we had to go .060".
  • 11.3:1 CR w/ flat-top 2-valve relief KB pistons, .026" down in the hole, block not decked
  • ARP rod bolts, resized stock 400 rods, 5.565", rotating assembly not balanced
  • Crane 'Blazer' hyd. flat-tappet cam & lifter kit, 234/244 @ .050" .488"/.510", 114 LSA
  • Vortec heads - stock retainers had approx. 3/32" ground off the bottoms for retainer to guide clearance (worked great), Crane single valvesprings with dampner removed, stock rocker arms and valves, fully ported bowls intake & exhaust; some minor runner work consisting of contouring and straightening the runner on the exhaust, and mostly roof work on the intakes with mild contouring of the runner.
  • Edelbrock RPM Vortec intake manifold, unported; Holley 3310 vac. secondary 750 - milled airhorn, installed #31 squirter, pink pump cam in position #3, secondary metering plate installed with #80 jets (stock #72 in front),quick-change vac.secondary pod installed with the white spring (lightest)
  • Hedman ceramic-coated 1 3/4" full-length headers, 3" dual exhaust with 2-chamber race Flowmaster mufflers and 18" turn-outs
  • Stock HEI (recurved), MSD Digital6+ ignition box with Blaster 3 coil, MSD wires, NGK plugs
  • Misc.: Holley Blue electric pump and regulator (set to 7 psi), sumped fuel tank, Flexalite dual electric fans with control box,TH400 transmission with 2800-3000 stall B&M converter, 4.10 gears, full spool, 33-spline axles, c-clip eliminators, welded axle tubes to housing, aluminum Moser rear cover girdle, Lakewood drag shocks 90/10 front/50/50 rear, no sway bars, 275/60 BFG drag radials rear on 15x8 Weld ProStars; 165/15 tires front on 15x3 Weld ProStars

And another:

Quote:
06sbc zero decked
Eagle 5.7" H-beam rods
Speed-pro dished pistons yeilding 10.3 compression
stock crank turned 10/10
unported vortec RPM intake
780vs carb
COMP CAMS duntov 30/30 nostalgia solid camshaft 247/254@050. .504"/.496"lift
31* total timing
1 5/8" long tube cheapy headers (open exhaust at the track)
TH400 with el cheapo 12" 3000 stall
3.42 gears
26x10" ET drags
3750lb race wieght with me in it

here is pic of my home ported vortecs
I have a few more if anyone is interested

I also backcut the intake valves with a 10* and a 20* grind and the exhaust valves with 30* 22* and 15* grinds. I can't say for sure whether or not it helped as some would say it hurts the flow of the vortec runners, but I did it anyway. I also performed the "ghetto grind to my retainers to allow for the extra lift.

I almost for got to post my times
best run to date with the above combo was a 12.35@108.9mph with a 1.76 60'. The only time I ever sprayed it with nitrous(100hp), I ran a 11.80@113.8 with a 1.65" 60'.



Maybe I'm off base here, but those combos look like they make good power, with good exhaust systems and dual pattern cams...heck one of the guys runs open headers at the track. Can't get more free-flowing than that.

1972 Malibu Sport Coupe - Victory Red on Black - 350/TH350

I do all my own stunts.
Highway Star is offline  
post #12 of 87 (permalink) Old Mar 17th, 10, 12:10 PM
Tech Team
Adam
 
Join Date: Feb 2010
Location: St. Louis, MO
Posts: 211
Re: Cam suggestions?

I just ran a quick DD of this setup, and the 1785 cam is within 3 hp/ftlb of the voodoo 262. I say that's pretty close to splitting hairs. When you can afford it I would get some 1.6 rockers to go with the 1785 cam. The 1785 cam kit is roughly half the cost of a Voodoo kit, and it'll have a little meaner idle with a tighter LSA. Use the voodoo if you want to put that col sticker on your window, but the 1785 is pretty close to the same in this application (works really well with stock vortecs because of the restricted lift).
ap72 is offline  
post #13 of 87 (permalink) Old Mar 17th, 10, 12:12 PM
Tech Team
Chris
 
Join Date: Jan 2007
Location: oklahoma
Posts: 32
Re: Cam suggestions?

I agree with highway star....just didn't think he wanted that much camshaft in it. The 488/510 - 234/244 is a damn good camshaft. Thought he was keeping it a little more mild then that..Those would be my choices though..

1st - 465/488 for a mild 5500 max rpm deal

2nd - 488/510 for a little more rpm and will need more converter

Stock suspension 71 chevelle
1.19 60'
4.96 @ 142
http://i235.photobucket.com/albums/e...AKO_1121-1.jpg
505chevelle is offline  
post #14 of 87 (permalink) Old Mar 17th, 10, 1:42 PM
Banned
Anthony
 
Join Date: Sep 2004
Location: Citrus Heights, CA
Posts: 9,690
Re: Cam suggestions?

Quote:
Originally Posted by Slick71ss View Post
I'm sure I'll get some flak for saying this, but I'd like to go with a budget cam and lifter kit for my application. Something like a Summit, Elgin, or Howard's cam kit. If one of those won't work well, then I'm open to other suggestions.

My setup...

This is for an 81 Camaro.
sbc 350
Vortec heads (milled .045)
9.8 to 1 compression
Performer RPM intake
600 Eddy carb, but probably going to swap out for a Holley 670
th350 trans
Would like to keep converter stall around/below 2400rpm
3:23 rear end

Car will be strictly street use, so prefer the powerband to be in the low to mid range rpms. Won't ever spin it past 5500 rpm.


I've been looking at the Elgin E1785PM (same as Summit K00172). Many say it's a clone of the Crane 274H06. What do you guys think?
I`d say the crane 274HO6 would be a good cam for you. This guy is claiming high 13`s with basicaly a stock engine so with your vortec heads you should run alot better. Maybe look into some 1.6 rockers. I`m thinking of going with this cam myself.

sschevellefan is offline  
post #15 of 87 (permalink) Old Mar 17th, 10, 2:48 PM
Senior Tech Team
 
Join Date: Apr 2006
Location: Temecula, CA
Posts: 1,068
Re: Cam suggestions?

Quote:
Originally Posted by 692envy View Post
I noticed the summit cam kit SUM-K1102 has the exact duration and lift numbers as the edelbrock performer cam and the SUM-K1107 which is probably bigger than you want but is the same as the edelbrock rpm cam
I have the Summit K1102 Cam in my 350sbc with stock smog heads. The performance with this cam is slightly better than stock. This cam with some better heads would help out a lot.
Augustboy2009 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome