327 or 350? - 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 04-23-2003, 11:24 AM
S10 Super Sleepers
 
Last photo:
Join Date: Apr 2003
Location: Genoa
Age: 33
Posts: 151
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post 327 or 350?

I have a 350 block 4 bolt main and a 327 block 2 bolt main. I can't decide which one to use in my sonoma. I'm thinking of the 327 because of its high rpm range, but the 350 has more hp. Any help?? The engine will be built the same regardless.

Edilbrock pro-flo injection (teflon coated)
Roller: cam, lifters, puchrods, rockers
headers
centrifical supercharger
9.5 to 1 compression

I would apreciate any input
Thanks

scott s

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-23-2003, 01:18 PM
MI2600's Avatar
Member# 3287
 

Last journal entry: Vortec Heads
Last photo:
Join Date: Jul 2002
Location: N. Muskegon, MI
Posts: 2,632
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

I wouldn't run 9.5:1 comptression with a supercharger.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-23-2003, 01:39 PM
Chevy Thunder's Avatar
Suspended
 
Join Date: Feb 2003
Posts: 103
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Go with the 350, you mite as well take advantage of the extra cubes. Along with more hp you will also get more torque, the extra rpm of the 327 dosent make up for that.

[ April 23, 2003: Message edited by: Chevy Thunder ]</p>
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 04-23-2003, 08:39 PM
BOBCRMAN@aol.com's Avatar
Member
 
Last photo:
Join Date: May 2002
Location: Holly, michigan
Posts: 8,130
Wiki Edits: 0

Thanks: 25
Thanked 267 Times in 250 Posts
Post

Ain't no substitute for cubic inches, drop the compression to 8.5 with that huffer on her.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 04-24-2003, 02:38 AM
S10 Super Sleepers
 
Last photo:
Join Date: Apr 2003
Location: Genoa
Age: 33
Posts: 151
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Whats wrong with the 9.5 to 1? That was what the manufacturer (powerdyne) recomended.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 04-24-2003, 05:22 AM
Honorary Redneck
 
Last photo:
Join Date: Nov 2002
Location: England
Posts: 194
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

From the powerdyne website;
[quote]
Q: How much compression ratio can you run?

A: Again, this can vary from engine to engine but a good rule of thumb with a Powerdyne Supercharger is you can run about nine pounds of boost on a 9:1 engine. If you have more compression ratio then you need to run less boost. If you have less compression ratio then you can run more boost.
In ideal circumstances you would like to have as much compression ratio and as much boost as you can run without detonation.

Q: Which is better, high boost and low compression or low boost and high compression?

A: You are better off with a low compression/high boost combination. The combination of supercharger boost coupled with your static or geometric compression ratio provides a resultant Effective Compression Ratio.<hr></blockquote>

So I'd drop that baby down to about 8.5:1 and run upto 15psi of boost

and if your going to build both engines the same regardless, there aint no substitute for cubic inches

if your running boost you must be talking decent pistons so the 350 will rev to about the same as the 327 anyway (may be marginally less).

choose camshaft wisely, make sure you go for one designed for use with superchargers to get the best effect from it

[ April 24, 2003: Message edited by: andybird ]</p>
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 04-24-2003, 07:26 AM
S10 Super Sleepers
 
Last photo:
Join Date: Apr 2003
Location: Genoa
Age: 33
Posts: 151
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Question, I'm new to the 327, What about fuel milage?
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 04-24-2003, 07:49 AM
EBlack36's Avatar
Rebuilt Excitment
 
Last photo:
Join Date: Aug 2002
Location: Lansing, Ks
Age: 62
Posts: 595
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

More than likely they will get about the same, a 350 is basically a stroked 350, both have the same bore.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 04-24-2003, 07:55 AM
Chevy Thunder's Avatar
Suspended
 
Join Date: Feb 2003
Posts: 103
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

350 is a stroked 327, just fixin that for ya
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 04-24-2003, 08:09 AM
EBlack36's Avatar
Rebuilt Excitment
 
Last photo:
Join Date: Aug 2002
Location: Lansing, Ks
Age: 62
Posts: 595
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Fat fingers
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 04-24-2003, 03:55 PM
Member
 
Join Date: Oct 2002
Location: Medicine Hat,Alberta
Posts: 179
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

the 327 do have an excellent rod stroke ratio that was good for acceleration.
__________________
Foot to the floor,hair back,knuckles white.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 04-25-2003, 04:43 PM
pcesak's Avatar
Sakman
 
Last photo:
Join Date: Jun 2002
Location: Houston, Texas
Posts: 64
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

I would go with 7.5 to 1
8.0 to 1 if you have to.

Holley Carbs has a wonderful disertation about blowers on their website under Weiand.
Grins
Pc
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 04-26-2003, 06:45 PM
New Member
 
Join Date: Feb 2003
Location: new bedford mass
Posts: 13
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

ever heard the phrase bigger is better ?
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 05:05 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.