What Cam is best for stock L31 Vortec 350 heads? 327 Build - 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 06-13-2011, 01:09 PM
Colder2012's Avatar
Registered User
 
Join Date: Jun 2011
Location: Vidor, Texas
Posts: 6
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
What Cam is best for stock L31 Vortec 350 heads? 327 Build

I am building a 327 (Forged Crank, Forged .40 over Flattop pistons, Roller Rockers, Edlebrock Performer Intake, Holley 600 Carb) I want a choppy/Lopey idle cam that would match up good for these heads, and still run on pump gas. My goal is 350+ HP. Any Suggestions?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-13-2011, 03:10 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,263
Wiki Edits: 326

Thanks: 610
Thanked 770 Times in 660 Posts
Quote:
Originally Posted by Colder2012
these heads
Ummm, could you be a little more specific?
Have you figured out the compression height of the pistons you will use? How about the piston deck height? What do the chambers in the heads pour to? What head gasket? How much does the vehicle weigh? What rear gear? What transmission? The cam and converter are the last two items you purchase for a build, after you have figured out everything else. You can't just reach out in thin air and pick out a cam without knowing all the stuff I asked you above.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-13-2011, 03:39 PM
GMC boogie's Avatar
Member
 
Last photo:
Join Date: Nov 2004
Location: Louisiana
Age: 48
Posts: 612
Wiki Edits: 0

Thanks: 1
Thanked 18 Times in 18 Posts
Isky 264 Mega cam
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-13-2011, 03:59 PM
Colder2012's Avatar
Registered User
 
Join Date: Jun 2011
Location: Vidor, Texas
Posts: 6
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Pistons are 10:0:1, 700R4 transmission, it is in a 92 1/2 ton chevy pickup, tbi to carb conversion. any other suggestions?
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 06-13-2011, 04:19 PM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 28
Posts: 8,244
Wiki Edits: 0

Thanks: 12
Thanked 221 Times in 206 Posts
The 264 cam from isky is a good one. I also like the 274h06 cam, which many companies sell, its 218/218 .450/.450 on a 106lsa. Something with about 215-220 duration and a 106-108lsa should work fine for you. I would go with a single pattern up to about 4 degrees more exhaust duration, any more is a waste.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 06-13-2011, 04:28 PM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,021
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
A choppy/lopey idle will not work well with stock gears and a stock stall speed.

And especially bad in a heavy truck.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 06-13-2011, 05:48 PM
Registered User
 
Join Date: Jun 2010
Location: TX
Posts: 1,108
Wiki Edits: 0

Thanks: 0
Thanked 94 Times in 86 Posts
Heat and preignition

A high stall converter and/or low ratio gears will make your engine run hotter. The hot running engine will drive the knock sensor crazy on the cool aid quality pump gas. The knock sensor will tell the computer to retard the timing in attempt to avoid engine damage.

It never ends, does it?
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 06-13-2011, 06:22 PM
Hippie's Avatar
Analog man in a digital world.
 

Last journal entry: HEI comparison.
Last photo:
Join Date: May 2003
Posts: 2,255
Wiki Edits: 0

Thanks: 3
Thanked 5 Times in 5 Posts
Quote:
Originally Posted by MouseFink
A high stall converter and/or low ratio gears will make your engine run hotter. The hot running engine will drive the knock sensor crazy on the cool aid quality pump gas. The knock sensor will tell the computer to retard the timing in attempt to avoid engine damage.

It never ends, does it?

From his initial post I'd say the knock sensor and ECM are no longer part of the equation.
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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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
How much power can I expect from stock 305 Vortec heads produce? Lil Big Mec Engine 3 03-07-2007 08:50 PM
Singh's Grooves in Ported & Milled vortec heads on stock 350 automotive breath Engine 204 01-31-2007 07:38 PM
Ported & Milled vortec heads on stock 350 automotive breath Engine 23 11-18-2006 02:07 PM
difference between vortec and regular stock heads inquiring_mind2 Engine 2 05-05-2006 10:43 PM
CC chamber of stock vortec heads!!! Johnny 5 Engine 1 03-10-2005 12:45 AM


All times are GMT -6. The time now is 12:28 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.