chevy 350 vortec heads ....wat cam?? - 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 08-31-2007, 11:05 AM
47chevrolet's Avatar
BuRnIn RuBbEr
 

Last journal entry: 350
Last photo:
Join Date: Jan 2007
Location: pickrell Ne
Age: 24
Posts: 48
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
chevy 350 vortec heads ....wat cam??

1970's chevy 350 four bolt with vortec heads. .30 over...What size carb and cam ?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-31-2007, 11:50 AM
383silverado's Avatar
Registered User
 
Last photo:
Join Date: May 2007
Location: tucson az
Age: 34
Posts: 389
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by 47chevrolet
1970's chevy 350 four bolt with vortec heads. .30 over...What size carb and cam ?
you will need a vortec style intake manifold.


what compression ?

roller or flat tappet ?
if you don't know what year is the block ?

600 0r 650 will do

and what is it going in ? car or truck

street strip, week end warrior, daily driver

do you want bottom end power or top end.

Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-31-2007, 12:04 PM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,654
Wiki Edits: 0

Thanks: 15
Thanked 58 Times in 55 Posts
We also need transmission, rear gear ratio, how is it to be used? street? strip? daily driver? If you can give the entire engine detail. We can`t guess what you want it to do with no information, not being harsh, just being honest.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-31-2007, 12:33 PM
Member
 
Last photo:
Join Date: Feb 2003
Posts: 642
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by DoubleVision
We also need transmission, rear gear ratio, how is it to be used? street? strip? daily driver? If you can give the entire engine detail. We can`t guess what you want it to do with no information, not being harsh, just being honest.

I concur and toss in the tire size while your at it
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 08-31-2007, 02:09 PM
xbody69's Avatar
CARNUT
 
Join Date: Jun 2007
Location: missouri
Posts: 4
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
vortexed

Bud Your Gonna Hafta To Give It Some Serious Thought Before You Throw Out Such A General Question To Such A Vast Audience Of Opinions And Experiences. Unless You Know Exactly What The Intended Purpose Of The Engine In Question Will Be, You Are Gonna Get About 100 Different Options From About 30 Different People.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 08-31-2007, 03:42 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
You will need 8 to 10 degrees more duration on the exhaust than intake due to the vortecs poor flowing exhaust port.

gear, stall, compression, and cam all must match
for example, in general for sbc's:

gear from 2.73 to 3.30: use 8.5 to 9:1 cr, stock stall, 200 to 212 degree cam

gear from 3.30 to 3.60: use 9.0 to 9.5:1 cr, 2200 stall, 212 to 222 degree cam

gear from 3.60 to 3.90: use 9.5 to 10:1 cr, 2600 stall, 222 to 236 degree cam

gear from 3.90 to 4.20: use 10.0 to 10.5:1 cr, 3000 stall, 236 to 248 degree cam

gear from 4.20 to 4.50: use 10.5 to 11:1 cr, 3500 stall, 248 to 260 degree cam

For heavy cars use the smaller cam in the range. So, if you have a truck with 3.55 gears then use a cam with 212 degrees duration at 0.050". Plus, when it comes to cams, it is always better to error on the small size.

**** Disclaimer ****
These are just general guide lines, opinions will vary.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 09-04-2007, 11:09 AM
47chevrolet's Avatar
BuRnIn RuBbEr
 

Last journal entry: 350
Last photo:
Join Date: Jan 2007
Location: pickrell Ne
Age: 24
Posts: 48
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
motor

rear end gear 3.73.. tranny th350...weekend warrior... going into a 93 s10 shortbox
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 09-04-2007, 02:28 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
I would use a cam with 230 to 232 degrees on the intake and 238 to 240 on the exhaust with 110 lsa. 10:1 cr with 2800 stall. Performer RPM intake with a Holley 750 DP. 1-5/8 full length headers with 2.5" mandrel bent exhaust with a X-pipe and Hooker Aero-Chamber mufflers. HEI with msd conversion, 20 degrees initial and 35 degrees total timing. If it is too loud, install a few dynomax bullets before or after the main mufflers.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 09-04-2007, 02:52 PM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,654
Wiki Edits: 0

Thanks: 15
Thanked 58 Times in 55 Posts
Still need more info, without the specs of the rest of the engine it`s shooting in the dark. I won`t recommend a cam for nobody if I don`t even know the compression ratio, the intake, headers, Ignition, timing components, pistons used and etc. If you call a cam company and ask them to pick a cam for you they will ask you all the above specs and if you don`t know the specs or give them they will not suggest a cam, they`ll tell you the exact same thing I just did. Without knowing the combo is almost like sticking a big cam in a stock 305 and wondering why it don`t run worth a flip. Do you have a converter picked out to run with a larger cam? the stock converter won`t even let it idle past a certain point of duration so a looser converter is called for. If I recommend a cam on the info you`ve given and it won`t idle or have any power until it`s revved you will not be happy and you will blame us for recommending a bum cam when we didn`t even know the specs.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 09-04-2007, 03:12 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,589
Wiki Edits: 326

Thanks: 700
Thanked 885 Times in 752 Posts
Quote:
Originally Posted by DoubleVision
Still need more info, without the specs of the rest of the engine it`s shooting in the dark. I won`t recommend a cam for nobody if I don`t even know the compression ratio, the intake, headers, Ignition, timing components, pistons used and etc. If you call a cam company and ask them to pick a cam for you they will ask you all the above specs and if you don`t know the specs or give them they will not suggest a cam, they`ll tell you the exact same thing I just did. Without knowing the combo is almost like sticking a big cam in a stock 305 and wondering why it don`t run worth a flip. Do you have a converter picked out to run with a larger cam? the stock converter won`t even let it idle past a certain point of duration so a looser converter is called for. If I recommend a cam on the info you`ve given and it won`t idle or have any power until it`s revved you will not be happy and you will blame us for recommending a bum cam when we didn`t even know the specs.
You tell 'em DV. I concur.
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
Ported & Milled vortec heads on stock 350 automotive breath Engine 23 11-18-2006 02:07 PM
XE274H cam sound like? Heads Choice? Help me decide on combo for chevy 400 Warrant Engine 10 03-01-2006 02:58 PM
Cam for Chevy 350? Mike_82 Engine 14 07-25-2004 02:56 PM
383-- use the vortec heads? what cam? slonova Engine 10 02-02-2004 11:45 AM
91 Chevy 350 to go vortec? bluechev4x4 Engine 9 12-12-2002 05:15 AM


All times are GMT -6. The time now is 06:51 PM.


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.