any thoughts on the 049 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 06-13-2010, 07:01 PM
chevykid90's Avatar
454, what turns your crank?
 

Last journal entry: Replacing bearings and crank
Last photo:
Join Date: May 2010
Location: Newport, Washington
Age: 23
Posts: 335
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
any thoughts on the 049 heads

i am building a 454 to put in my 81 firebird and have 3 sets of heads to chose from. i have 292, 236 witch i am most likely not going to use, and 049. the block has been bored .030 by the person prior to me other than that i am making a mostly stock motor. not going for high horsepower motor. its my first big block build so i am taking baby steps.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-14-2010, 07:05 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
The 049 heads are the only viable choice of the three you mentioned for a performance build. The 049 heads are open chamber so CR will be low unless there's some positive dome to the piston.

They respond well to larger valves and pocket porting to clean them up- this is true whether or not you cut them for bigger valves, but is a necessity if they're cut for the big valves. If you don't, there's a good chance they'll flow less than w/the OE valves in them.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-14-2010, 07:10 AM
chevykid90's Avatar
454, what turns your crank?
 

Last journal entry: Replacing bearings and crank
Last photo:
Join Date: May 2010
Location: Newport, Washington
Age: 23
Posts: 335
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
i couldn't find anyone around here that had a set of closed chamber heads that were in my price range. but in my numbers book these heads had the smallest chamber size with 112cc. i am not going into having bigger valves put in, but will porting them give me any significant gains?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-14-2010, 07:28 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by chevykid90
i couldn't find anyone around here that had a set of closed chamber heads that were in my price range. but in my numbers book these heads had the smallest chamber size with 112cc. i am not going into having bigger valves put in, but will porting them give me any significant gains?
If you can do it yourself, there's something to be gained in many cases, by smoothing the transition from where the factory tooling cut the last angle into the port. There is almost always going to be a "lip" that interferes w/the flow, as well as the usual casting flash and irregularities that occur as a matter of course in mass produced iron castings like these heads.

There's not as much to be gained by porting the runners, the "low-lying fruit" is said to be the bowl. A three angle valve job done correctly will be an enhancement that will likely be as much of a gain as anything else you might do, so be sure and have that done.

A 30 back cut done on the valves is also helpful, and doesn't cost a fortune to have done.

There are reduced diameter valves available for your BBC. The entire stem isn't reduced- just the portion that's in the bowl area of the head. I've not used them, and I have heard conflicting reports of how much is gained by using them. If your research shows them to be beneficial- and IF valve replacement is needed anyway- they'd be an option worth considering.
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
HiPo heads RJL Engine 16 06-29-2009 09:18 PM
049 Heads Glenn Holt Engine 8 12-17-2007 11:07 AM
getting old iron heads to flow? (SBC) KNanthrup Engine 9 12-21-2005 05:06 PM
FE blocks SAATR Engine 27 03-14-2005 04:35 PM
sbc heads Jared Engine 7 03-03-2003 07:07 PM


All times are GMT -6. The time now is 12:09 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.