350 sbc..305 heads?? - 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 01-28-2005, 10:08 AM
Registered User
 
Join Date: Jan 2005
Location: oklahoma
Age: 39
Posts: 3
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
350 sbc..305 heads??

I am currently in the building stage of a 350 chevy small block and had a quick question on the heads I may be using. A friend of mine suggested that I use a set of 305 chevy heads which would be worked to accomidate a 1.94 In/1.60EX. valve with a 58cc chamber. He said that it was a pretty do-able thing and would make my compression ratio very good as well.....anyone have any experience with this kind of build??? any ideas would be greatly appreciated..Thanks

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-28-2005, 12:00 PM
Silentlion_69's Avatar
Duck Tape & WD 40
 

Last journal entry: No more Vehicle
Last photo:
Join Date: Nov 2003
Location: Lagrange Maine
Age: 26
Posts: 278
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
maybe if you would post this in the engine section you'd get a good answer
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-28-2005, 02:01 PM
poncho62's Avatar
Out of the Loop Moderator
 
Last wiki edit: Streetbeasts links
Last journal entry: at car show
Last photo:
Join Date: Oct 2003
Location: Hanover, Ontario, Canada
Age: 62
Posts: 16,864
Wiki Edits: 5

Thanks: 20
Thanked 250 Times in 203 Posts
moving it.....
__________________
Ontario Rodders

Budget RVs
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-28-2005, 03:06 PM
RCastle's Avatar
Come Home Safe Soldier
 

Last journal entry: Headers
Last photo:
Join Date: Aug 2004
Location: Louisville,Kentucky
Age: 43
Posts: 848
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
From what I understand you can do it,but you can do the same with a set of 350 heads and they flow better than the 305 heads.The 305 heads even ported do not flow like a set of 350 heads I believe. So in essence sinking the money in them is not worth it.Somone correct me if I am wrong.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-28-2005, 03:07 PM
Siggy_Freud's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Dec 2003
Location: Portland, Oregon
Age: 29
Posts: 2,371
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
There are a few people here that have had success running 305 heads on a 350. However I believe they have given them a significant port job to flow well enough for a 350. Depending on your pistons, those small combustion chambers might put you a little high on compression and give you some trouble running pump gas.

There are are lot better options for heads both in stock form and aftermarket for the 350 than 305 heads.
__________________
Bringing history and technology together.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 01-28-2005, 07:54 PM
Mad Maggot's Avatar
The lean mean donut machine
 
Last photo:
Join Date: Aug 2004
Location: Red Deer, Alberta, Canada
Age: 31
Posts: 386
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I currently run 305 heads on my 350 in my Trans Am, I did give them a port job to help them along though. I got them to flow 203cfm intake and 155 cfm exhaust with the stock valves, which is about as good as a stock 350 head. I get about 400HP out of my motor with them, but that is about maxing out the head flow, and being helped by 11.7:1 compression. I need to run octane boost with this much compression, plus a special waterless coolant to prevent detonation. If you are willing to do some porting to them they can be made to work quite well, but if I had to do it over again I would have used 350 heads with small chambers.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 01-28-2005, 08:28 PM
killerformula's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Carburetor
Last journal entry: Clean up
Last photo:
Join Date: Oct 2003
Location: Northeast
Age: 34
Posts: 3,485
Wiki Edits: 3

Thanks: 13
Thanked 27 Times in 18 Posts
bowl area is constrictive due to small valves, the runners are about the same. There's a fair bit of work involved, but you sound like you want to bolt them on just for the compression boost. No, its not worth it for that, ever.

K
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 06:05 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.