781 heads?? - Team Camaro Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old Apr 21st, 11, 06:17 PM Thread Starter
Senior Tech
Hector
 
Join Date: May 2010
Location: Mass
Posts: 835
781 heads??

Well after everyone telling me my top end might be weak.. Was wondering .

I have a set of 781 in my basement.. Would it be worth it to get them prepped with lighter valves..and maybe mill the heads down to increase compression..

Would it make a big improvement over the peanut ports.. If so now much..on a stock 86 454..

Thoughts opinions.. Thanks in advance

68 Camaro Coup, BBC ,2457 headers, th400 , ford 9", Hotchkiss connectors,
Speedjester is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old Apr 21st, 11, 11:14 PM
Senior Tech
darrell
 
Join Date: Feb 2011
Location: texas
Posts: 1,202
Re: 781 heads??

which heads are on it now-the 071s---in my passed reference, the small cc peanut heads have out done the 781s-the factory flow on 781s is much more--i have run the same set up with closed chamber head and then tried the 781s and lost 2 tenths--in my opinion hog out the peanuts -high flow valves and correct spring set up
97Z4C is offline  
post #3 of 5 (permalink) Old Apr 21st, 11, 11:21 PM
Banned
Bethanne
 
Nashville Beth's Avatar
 
Join Date: Jan 2007
Location: Nashville TN
Posts: 3,192
Re: 781 heads??

I would never sink $800 in a set of cast iron heads when the edelbrocks are $1500.

But if the budget is tight, bigger valves in the 781's would be the way to go. Use steel shim gaskets to help the compression.
Nashville Beth is offline  
 
post #4 of 5 (permalink) Old Apr 22nd, 11, 03:15 AM
Senior Tech
Ron
 
Join Date: Nov 2006
Location: North Channel Lake Huron
Posts: 3,934
Re: 781 heads??

As Beth says consider the cost of rebuilding the 781's Vs a set of aftermarket Heads. One thing it's NOT feasible to change OEM Specs by Milling Heads over and beyond just smoothing the surface as you run into all shorts of incompatible problems. 781's require Domed Pistons to get the Static Compression up to a point where you can run a stout cam.

If you running OEM Flat Top pistons and on a budget you're probably better off with Closed Chambered 396 heads on a 454 to get the Static up to approx 9.1 and run something like a 270H-10 cam.

Z15CAM - There was a Viper in my Rear View
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

This was my 70 1/2 Z28

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Z15CAM is offline  
post #5 of 5 (permalink) Old Apr 22nd, 11, 10:01 PM
Senior Tech
darrell
 
Join Date: Feb 2011
Location: texas
Posts: 1,202
Re: 781 heads??

yep -i agree with yall
97Z4C is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user 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.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

 
For the best viewing experience please update your browser to Google Chrome