409 SBC Cam Choices - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 02-12-2006, 02:59 PM
Registered User
 
Last photo:
Join Date: Feb 2006
Location: Chicago Area
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
409 SBC Cam Choices

I am getting further along with my 409 small block project and I keep running into the issue of appropriate cam(s) for my application.
As much as I'd like to run the 30-30 Duntov cam, virtually everything and everyone is telling me that this probably isn't a good choice.
Here are my specifics:
1969 Corvette, 3200# curb weight, stock Muncie 4-speed (2.52 first gear) and 3.70 axle. No A/C, no Power Steering, no Power Brakes.
This is a street car- No drag racing, just some fun on the street.
Looking for low end torque, (1500-5000 range?) 5000 to 5500 RPM MAX.

I'd like to stay with a flat tappet mechanical cam just for fun (or punishment?)-
The engine specs are as follows:
400 CID small block, 4 bolt mains, bored .040 over.
Sealed Power L2352F pistons and Moly rings.
Stock 400 crank and 5.565 rods.
L-98 Aluminum heads with mild porting (58+CC), 1.94 intake, 1.50 exhaust.
LT4 valve springs and retainers, factory 1.5 stamped rockers.
10.5-10.6 static compression with .039 head gaskets.
Factory cast iron 'Ram Horn' exhaust manifolds with 2" full duals (may go to 2.5").
Factory ZZ4 aluminum, dual plane intake.
Holley 650 Spreadbore or Holley 750 model 4779 carb (can go either way).
Stock tach drive distributor with Pertronix II ignition and recurved.

With this configuration, I am looking at two different Elgin grinds (or any others that may be suggested)-
E-1133-P
.498/.498 lift, 246/246 duration @ .050, 65 degrees overlap, .030/.030 lash, 106/110 lobe centers
E-1131-P
.521/.521 lift, 240/250 duration @ ,050, 75 degrees overlap, .024/,024 lash, 104/108 lobe centers
Will either of these cams be more suitable than the 30-30 or am I still looking at way too aggressive of a cam? The only engine changes I would consider are going to roller rockers (1.5 or 1.6 ratio) and possibly headers.

Any suggestions or advice would be greatly appreciated!
Thanks-
Elm.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 02-12-2006, 03:31 PM
Steve karch's Avatar
Member
 
Last photo:
Join Date: Feb 2002
Location: Regina, Saskatchewan
Age: 55
Posts: 414
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The biggest problem with the cams you spec'd are your heads, intake and exhaust. Those cams will give you a wicked idle but wont make power. You need air flow and rpm and your heads, intake and exhaust wont support it. You need at least a 200 cfm head and 2.5 in exhaust with headers and a highrise dualplane intake such as performer rpm or a single plane such as a Wieand Team G. With your heads, intake and exhaust I would recommend a cam with specs in the 214in/224ex range. This will give you a decent low end for torque and will pull to 5000 rpm. You will have to lower the compression somewhat, maybe use thicker head gaskets but this combo will give you a decent performing engine. To give you an example, in my 406 I have World Products Sportsman ll heads, performer rpm intake, 1- 3/4" headers, 5.7 in rods, aprox 9.8:1 compression and a Comp Cams Magnum 280 cam which is mild for this engine. It dyno'd at 425 hp and 480 lbft torque. I was going to up the cam to something in the range of 250 in and 260 ex but have decided against it as my set up gives me tons of torque and still pulls to 6500 rpm and is a very tame engine to live with.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-12-2006, 07:24 PM
NAIRB's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2002
Location: cimarron, ks
Posts: 1,658
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
There would be absolutely nothing wrong with running the old 30-30 cam. It would work just fine.

You've got a light weight car, lots of compression , and your power band will be reduced with the increased cubic inches. If you do some porting on the heads, you could get it to breath to 6500 RPM. Plenty of R's for a 400.

I would stick with your first instinct and run the old Duntov cam.

Brian
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 02-21-2006, 07:23 PM
Registered User
 
Last photo:
Join Date: Feb 2006
Location: Chicago Area
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
Lazer Cams

OK-
I chickened out.
While I still have the 30-30 in the box just in case, I also dropped the 'Cam Wizard' a note at Lazer cams and he recommended the following for my set-up:
Duration @.050: 243 248
Lift @.050: 511 480
Lash: .026 .028
Lobe separation: 108, with 104 intake centerline

I requested a mechanical cam that sounds like the 30-30 but has more low end torque (since I will rarely, if ever, see much past 5000).
The specs sounded enticing enough that I went ahead and ordered it.
Anyone else have any experience with these cams that they can share?
Thanks!
Elm.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 08-30-2012, 08:40 PM
Registered User
 
Join Date: Aug 2012
Posts: 4
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The cams you are talking about won't give you much vacuum. Do you still have the pop-up headlights and pop-up winshield wiper door? Not having power brakes is a plus with those cam specs.

I just put a Lunati cam in my 69 Vette lift .504-.525 duration at .050 233-241 advertised 276-284 but had a special lobe seperation cut to 112 to help me keep my vacuum for brakes, lights and windshield wiper door.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 08-30-2012, 09:01 PM
vinniekq2's Avatar
Registered User
 
Join Date: Jun 2012
Location: BC,Canada
Age: 56
Posts: 8,320
Wiki Edits: 0

Thanks: 342
Thanked 814 Times in 780 Posts
That cam you chose will work the headlights. It will make decent mid range and still sound mechanical. My cam is 108/108 lsa and icl with 256/264 @050 and my headlights go up a little slow at idle.The brakes work fine as I have a standard.

your vette has room for 3 inch exhaust if you dont carry a spare. Use headers
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 08-30-2012, 09:17 PM
60GR8Chevy's Avatar
Registered User
 
Join Date: Jul 2012
Location: Weatherford,Texas
Posts: 25
Wiki Edits: 0

Thanks: 7
Thanked 0 Times in 0 Posts
Iv'e used Lazer cam's in the past on two of my IMCA Stock Cars. you give him all the info he needs and he'll make your car fly!
was very pleased. ******************.
dur @20 .289/294
dur @50 TL .251/.256
lobe lift .359/.363
gross lift .538/.544
lobe center sep 106*
install cam at intake lobe centerline of 102*
1/4 mile dirt car... worked great

Last edited by 68NovaSS; 08-30-2012 at 09:47 PM. Reason: Use the free classifieds to sell your item, not permitted in the forums.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 08-30-2012, 09:45 PM
68NovaSS's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Working with chromed bolts
Last journal entry: New to me T-Bucket
Last photo:
Join Date: Sep 2002
Location: Nine Mile Falls/Suncrest, WA
Posts: 5,258
Wiki Edits: 9

Thanks: 105
Thanked 133 Times in 124 Posts
Quote:
Originally Posted by Nicanor View Post
The cams you are talking about won't give you much vacuum. Do you still have the pop-up headlights and pop-up winshield wiper door? Not having power brakes is a plus with those cam specs.

I just put a Lunati cam in my 69 Vette lift .504-.525 duration at .050 233-241 advertised 276-284 but had a special lobe seperation cut to 112 to help me keep my vacuum for brakes, lights and windshield wiper door.
I think you're talking to the wall, this thread is over 6 1/2 years old...
__________________
Boost adds dignity to what would otherwise be a vulgar brawl...

Midnight Sun Street Rod Association
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 08-30-2012, 09:54 PM
vinniekq2's Avatar
Registered User
 
Join Date: Jun 2012
Location: BC,Canada
Age: 56
Posts: 8,320
Wiki Edits: 0

Thanks: 342
Thanked 814 Times in 780 Posts
omg,sucked in again,lol.why do people keep bringing back old threads,,,
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 08-31-2012, 07:43 AM
Registered User
 
Join Date: Aug 2012
Posts: 4
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
actually because I am going to build an engine for street strip and by responding to this post I was lucky enough to get some great current info. Sorry to bring up and old post though.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last 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 for yourself.
Email Address:

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
SBC 270H Comp Cam 72Vette Engine 17 12-31-2011 12:01 AM
SBC 350 superiority rebuttle...was:POWERED BY CHEVY, WRITTEN ON A FORD, (from 'Engine Oldsmolac911 Hotrodders' Lounge 50 01-12-2011 10:00 PM
400 SBC...New CAM thecamaroguy Engine 41 03-15-2005 06:47 AM
ZZ3/4 cam into pre 87 SBC? RX7Jeff Engine 2 03-06-2005 07:07 PM
sbc cam install al37ford Engine 3 02-19-2005 12:25 PM


All times are GMT -6. The time now is 01:57 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.