ls6 crate motor upgrades? - 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 06-12-2004, 10:38 AM
Member
 

Last journal entry: pro systems carb
Last photo:
Join Date: Jun 2004
Location: StThomas Ont
Posts: 51
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
ls6 crate motor upgrades?

Hello newbie onboard, I'll make this short I have a ls6 454 in my 55 chevy xe 284 hydraulic cam , single plane intake, 750 dominator carb, 373 gears out back , 325/50 drag radials, 400 turbo 4k stall convertor. (cam is about 240-246 duration, 575-580 lift). My best times are 11.99 at 112 the car is 3850lbs with driver, what do you guys think should I buy some oval port heads like all the mags say now or a big roller cam, if heads then who's do you like or well done 049's?. Thanks
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-12-2004, 07:15 PM
Member
 
Last photo:
Join Date: Sep 2002
Location: New Jersey
Posts: 416
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I would stay with the stock rectangular heads.with 5000 stall you wont wee much of a differance going to ovals.What type of intake do you have.If I were running that combo I would run a port matched strip dominator or old style torker along with a 2" spacer and a 4150 type carb.With that engine you need at least 1 7/8" headers and 3.5" muflers for the engine to breath to it's potential.
Another issue is that the LS6 had marginal compresion at best,and real world numbers were about 10:1 with the stock crate motor gasket,or about 9.75:1 with some of the newer thick gaskets.I would run the intake combo and headers I mentioned.If you wanted to dig into the engine you might want to pop the heads off,and give them a bowl blend job as well as have a good 3 angle valve job done on them.If they are bone stock you are leaving some power on the table there.Your car is a tad heavy,and the th400 is heavy too.I would say that you might get a well prepped LS6 to run mid 11's in a car that heavy,but that is about it.If you really want to step it up,try getting the compression up to about 11.5:1,and running a little more cam.I say maybe something with at least 260 degrees at .050,and spin that bigblock to about 6500.That could be a 10 second combo if you do it right.Let us know more about what you have.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-13-2004, 11:38 PM
Member
 

Last journal entry: pro systems carb
Last photo:
Join Date: Jun 2004
Location: StThomas Ont
Posts: 51
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for the reply super streeter, I have had the heads flowed but I dont have the numbers (rookie mistake) , the intake is a weiand team g single plane which is not ported the heads, if that is worth anything I'm not sure. The compression in the cylinders has been checked and it ranges from a low of 185 to 200 psi , so I think I'm close to not being able to run pump gas, although in the great white north we get 94 octane ,at a buck a litre. 11.5 to one comp probably will take me out of pump gas which I would like to stay with. I'm wondering about the difference in a solid cam as opposed to a solid-roller cam, big diff in price, what about performance? In the tens would be awesome, keeping my heads would really save me some cash too. The chassis is pretty good with a 12 bolt 3.73's ladder/bar coil over, mini tubbed 28/12.5 bfg drag radials, the front has 6 cyl springs and 90/10 shocks, weld pro stars all around, the 400 turbo is reverse manual valve body, with a neil chance 10" convertor, (4000-4500), cage with full interior, the headers are 1.75 *3.00 hedmans leading to 3inch flowmasters tailpipes are 3.5inch s/s out to back bumper, (I'll get some pic's attached if your interested) Also roller rockers and a stud girdle on the valvetrain.

Last edited by fast times; 06-14-2004 at 01:18 AM.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-14-2004, 02:57 AM
bigbad66chevelle's Avatar
Member
 
Join Date: Mar 2003
Location: somis,ca
Age: 31
Posts: 61
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
a little nitrous never hurt nobody and even better with all those strong big block parts.........
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 06-14-2004, 10:46 PM
Member
 

Last journal entry: pro systems carb
Last photo:
Join Date: Jun 2004
Location: StThomas Ont
Posts: 51
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I'm with ya big bad chevelle , but I would like to sort this combo out to its max, before I juice it. If I could run low /mid 11's with the 3.73's and a 28" tall tire I would have some rpm's left for 150hp of nitrous, for sure in the tens then and still drive on the highway at about 2800-3000 rpm. Just love to hear from someone with ls6-ls7 heads and a heavy car, find out the potential of the combo.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 06-22-2004, 11:20 PM
Member
 

Last journal entry: pro systems carb
Last photo:
Join Date: Jun 2004
Location: StThomas Ont
Posts: 51
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
bump
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



All times are GMT -6. The time now is 06:01 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.