putting 305 heads on 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 10-08-2003, 12:34 AM
low77ride's Avatar
Member
 
Join Date: Oct 2003
Location: Canada
Age: 27
Posts: 136
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
putting 305 heads on 350

Ok here it goes i have a 1977 monte carlo with a 350 sbc. My friend has 305 heads he wants to get rid of, so what im wondering is it i can just bolt them up to my 350 putting out 8.5:1 compression ? And do i have to up size the ports and valves or can i leave them stock aslo what kinda horse power difference will i be getting? thanks

    Advertisement
__________________
" You cant piss on what you cant catch"
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-08-2003, 01:01 AM
Dans83Olds's Avatar
Sucking Gas & Haulin' A$$
 
Join Date: Apr 2003
Location: South Dakota
Age: 32
Posts: 53
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
A friend of mine has a 350 punched .60 with port and polished 305 heads on his 87 camaro. People kept telling him that he would have detination problems due to the high compression. As to date he has had no problems with pinging. He has his timing set at 4 degrees past stock. he runs 89 octane in the car.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-08-2003, 01:10 AM
NorthStar's Avatar
Member
 
Last photo:
Join Date: Feb 2003
Location: Minnesota
Age: 51
Posts: 847
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Which 305 heads? Theres a few different chamber sizes.
If theyre 434 casting number you could install larger valves and do a pocket port & little unshrouding those would work super for what youre trying to do.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-09-2003, 12:13 AM
low77ride's Avatar
Member
 
Join Date: Oct 2003
Location: Canada
Age: 27
Posts: 136
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Yea im not sure the # but if they have 434 casting # i will do so thanks.
__________________
" You cant piss on what you cant catch"
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-07-2004, 11:52 PM
low77ride's Avatar
Member
 
Join Date: Oct 2003
Location: Canada
Age: 27
Posts: 136
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Ok my friend just bought a running stock 350 4bolt main out of a 1984 chevy truck for 350 with carb. Hes transplanting the motor into a caprice classic (X-cop car). The motor leaving s a plane jane 305 (not H.O.). We were wondering what would the stock 305 heads do if we put them onto the 350? Boost HP any at all? Or just break even with what it allready has? Were getting the motor tomorrow so we want to know if this will help any? thanks for the help its greatly appreciated.
__________________
" You cant piss on what you cant catch"
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 01-08-2004, 05:27 AM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,657
Wiki Edits: 0

Thanks: 15
Thanked 60 Times in 57 Posts
the 305 heads will kick up the compression on a stock 350, and the small runners and valves will give it lots of low end power, but it`ll fall on it`s face at 3500 rpm. decent 305 heads are the 416, 440 casting and the 601 castings used on HO engines, the valve sizes are 1.84 intake 1.50 exhaust with 58cc chambers, you can have 1.94 valves added but it won`t be of much help unless the chamber is deshrouded.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 01-08-2004, 07:48 AM
low77ride's Avatar
Member
 
Join Date: Oct 2003
Location: Canada
Age: 27
Posts: 136
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
So a set of stock 305 heads will work but at about 3500rpm them will just stop pulling or having any power past 3500? When in lower rpms will the motor shine ?
__________________
" You cant piss on what you cant catch"
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 01-08-2004, 03:52 PM
mikeweyman's Avatar
Member
 

Last journal entry: 2 years later
Last photo:
Join Date: Jan 2003
Location: nova scotia canada
Posts: 581
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
that combo will give you about 10/1 compression or higher.It will come off the line like a scalded cat, but will die out about half way through the gear. great bottom end would be o.k. in say a 4 wheel drive truck or plow, not a car.
hold the car back in first and see where 4000 rpm is .real quick but not fast.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 01-08-2004, 04:43 PM
malducci's Avatar
New Member
 
Join Date: Oct 2003
Location: tucson
Age: 38
Posts: 16
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Some info on the 434 heads - there 60cc chamber - 160cc intake and 57cc exhaust ports. I CC'd them the other day. The set I own have 1.72/1.5 valves - put some 1.94/1.5 valves in them though if you can get it done for cheap.
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:
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 01:24 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.