350 top end re-build ? - 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> Hotrodding Basics
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 12-27-2006, 07:06 AM
Registered User
Join Date: Dec 2006
Location: chance,maryland
Posts: 30
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
350 top end re-build ?

I am new to this site and wanting to learn (I need all the help I can get).

I am going to do a top end re-build on a 1976 chevy 350ci and I need advice. It is a 4-bolt main with stock 75cc factory heads. I want to get 300+ HP, keeping it streetable and reasonable in cost. What is the best combination of heads, cam and intake/carburator ?? (or any other suggestions).

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 12-27-2006, 08:50 AM
farna's Avatar
Last wiki edit: AMC V-8s Last photo:
Join Date: Sep 2002
Location: Batesburg-Leesville, SC
Age: 55
Posts: 1,720
Wiki Edits: 14

Thanks: 0
Thanked 26 Times in 24 Posts
I'd go with an Edelbrock "Performer" package. It's a good all-around enhancement that won't affect driveability much. Note that you really need to replace the cam to get the power you want. Even a "Performer" cam should get you close. A 600-650 cfm carb, better intake, and a low restriction exhaust (2.5" single, 1.75"-2" if duals) will help even without a cam change. You can change the intake/carb and make the other mods without opening the engine, then change the cam later.

If you will be driving in cool/cold weather (say under 45 degrees) stay away from an "air gap" type intake. They take longer to warm up. You won't want an open air breather either -- same problem. You do want a low restriction filter element (I like AMSOIL or similar oiled foam vs. K&N -- the K&N is ruined if it gets regular oil on it, and my AMSOIL filter seems to flow as good as a K&N, or nearly so), and a large snorkel if using a factory housing.

Is this a high mileage engine? If it is, don't change the cam until you build the bottom end. The increased load on the engine will accelerate deterioration and you could have other problems. If the engine has under 100K and has always been taken care of, you should be okay with the other mos. If it's over 100K, even the bigger carb and intake will increase the load and could strain the rings, accelerating rebuild time.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 12-27-2006, 02:23 PM
Registered User
Join Date: Dec 2006
Location: chance,maryland
Posts: 30
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
350 top end re-build

Thank You farna for the advice. Can I do the things you suggested sticking with my 75cc factory heads ?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-01-2007, 09:33 AM
75gmck25's Avatar
Registered User
Last photo:
Join Date: Aug 2006
Location: Alexandria, VA
Posts: 2,005
Wiki Edits: 0

Thanks: 4
Thanked 108 Times in 104 Posts
Everything farna suggested (the Edelbrock performer package and headers) will work with '76 factory heads.

The next step up would be to add GM Vortec heads from a newer 350, or similar heads from aftermarket sources. Vortec heads are 64cc chambers, and they have quite a bit better flow than the '76 vintage heads. Vortec heads require a different intake manifold, but Edelbrock and others sell Vortec manifolds for about the same price as those for stock '76 heads. Most sources show about 30 hp gain simply from the switch to Vortec heads.

If this 350 is going in a light vehicle and/or you can use a high stall torque converter, you might also look at a more aggressive cam than the Edelbrock package.

However, all of this depends on how worn the engine is in the lower end. If its an original '76 engine and has high mileage, it probably won't deal well with the additional horsepower.

Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-10-2007, 09:27 PM
techinspector1's Avatar
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Zephyrhills, Florida, USA
Age: 75
Posts: 15,460
Wiki Edits: 326

Thanks: 1,548
Thanked 2,082 Times in 1,611 Posts
You're starting at the wrong end of the car. Put some gear in it before you start tweaking the motor.
Reply With Quote Quick reply to this message

Recent Hotrodding Basics posts with photos

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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
350 build advise stoney 81ta Engine 7 11-05-2006 10:10 AM
help needed!!!! please read ... 350 build questions... 74chevyflat Engine 10 06-09-2006 09:42 PM
Oil to top end (passenger side) lt1bbody Engine 13 05-03-2005 02:23 PM
GMC 350 Top End Oil Problem bns2002 Engine 16 12-11-2003 03:29 PM
350 tbi build up jackfrost51 Engine 3 02-01-2003 02:39 PM

All times are GMT -6. The time now is 09:04 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.