What are the best heads to put on a 305? - 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 11-05-2004, 06:13 PM
CCR's Avatar
CCR CCR is offline
New Member
 
Join Date: Sep 2004
Location: usa
Age: 26
Posts: 16
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Arrow What are the best heads to put on a 305?

I've been looking into getting new heads because mine aren't doing very well and I also want more hp. My friend has an 80 camaro with a 305 in it and it has 350 heads on it and I was thinking about doing something like that. I was wondering if I get a pair of rebuilt 350 heads for my 305 if it would give me more hp than my stock heads. The other thing that I was concerned about was if 350 heads would fit on my 305. What size heads would fit on my 305,or is it pretty much all small block Chevy heads. I am planning on getting the heads off ebay. Any information or input would really help.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-05-2004, 06:56 PM
roys63's Avatar
Member
 
Last photo:
Join Date: Dec 2001
Location: Nc
Age: 63
Posts: 907
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
put 305 heads back on.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-05-2004, 07:48 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
Putting 350 heads on a 305 is going to drop your compression quite a bit. Id get a nice port and valve job on your current heads or look into some aftermarket heads for the 305.

Or you could take the money and instead, invest in a 350 and get more ponies out of that then you would doing any amount of work to those heads.
__________________
Bringing history and technology together.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-05-2004, 08:39 PM
stepside454's Avatar
Member
 
Last photo:
Join Date: Dec 2003
Location: St. louis area
Age: 47
Posts: 1,074
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Ive built a couple mild 305s that actually ran pretty strong, I think the 4 best choices are:
Vortec
L-98 vette aluminum
GM FastBurn

World Products S/R torquer 305s
I had L-98s on the 305 I built for my 86 Caballero....ran 13.70s with 3.08s
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-05-2004, 11:35 PM
club327's Avatar
Member
 
Last photo:
Join Date: Nov 2003
Location: australia
Age: 50
Posts: 334
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
What casting heads to you have? If they have 58cc combustion chambers and 1.84" intake valves then I'd keep them. Just clean up the ports under the valve seats and around the guides and you'd make noticeable gains throughout the RPM range. The Vortec heads I like, but can be a headache as they require a dedicated manifold, self aligning rockers and are limited to about .460" valve lift in unmodified form. They also need center bolt rocker covers. You want to keep your compression at around 9.5:1 and to do this you'll need the 58cc chambers. The Vortecs, being 64cc's will drop it under 9:1.
If you need to buy replacement heads then my pic would be the World SR 305 torquer heads. They're a bargain in my book.
They feature the following;
Bronze valve guides
Screw in studs
Hardened exhaust valve seats
3 angle valve job
Manley stainless steel valves
171cc intake runners
58cc combustion chambers
1.94" intake valves
are fully machined and have extra thick decks for crack resistance and also if further machining is required.
If you bought junkyard heads, then they'd cost you more than the SR's in the end if you were to have them updated to SR standard.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 11-06-2004, 01:08 PM
firestone's Avatar
http://teamrfc.gospelcom.net
 
Last photo:
Join Date: Nov 2003
Location: Fenton MI
Age: 32
Posts: 1,743
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
I would leave the 305 heads on it, and buy an aftermarket cam, intake manifold and carbeurator. Doing these things will make more difference than using a set of 350 heads. The problem with the 350 heads is not only the drop in compression. The bore on a 350 is larger than a 305. I have heard that This means that if you use a set of 350 heads on a 305, the 305 bore will shroud the combustion chamber of the 350 head and cancel out pretty much all the gain you would have had with the better flow of the new heads. After you did the cam,intake,carb swap on your motor, If you wanted to go faster, just throw a 200 shot of nitrous on it, just kidding!!!haha. Sorry, no, but really, I would start buying parts for a 350 or 383 so that someday, you will have all the parts for one and then you would really have someting to work with. Has anyone else heard of the shrouding valve problem with the 350 head 305 cylinder situation.

Adam
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 11-06-2004, 01:50 PM
stepside454's Avatar
Member
 
Last photo:
Join Date: Dec 2003
Location: St. louis area
Age: 47
Posts: 1,074
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Fireston, yep, in most cases..
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 05:22 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.