Building a 400 HP Engine from a 1979 350 bottom end what's required ? - 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 07-17-2008, 08:40 PM
Registered User
 
Last photo:
Join Date: Jan 2008
Location: Chile
Posts: 376
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Building a 400 HP Engine from a 1979 350 bottom end what's required ?

Hi everyone ! Back on building engines again !
what do we have ?
My friend has a .60 bored 1979 350 Engine bottom end with flat top pistons.-
His goal its to achieve 400 HP
He also wants a double four barrel intake manifold plus 2 Quadrajet carbs.-
Will it work ? What heads to choose ?
what valve springs / roller rockers and which cam ?
Do you think its possible ????
He really dont care about the mileage,he wants power but a streetable machine...it will be on a old chevy nova.-
thanks !!!!!!!!

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-17-2008, 09:39 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,153
Wiki Edits: 0

Thanks: 5
Thanked 380 Times in 374 Posts
Yes it will work but the qjets will make it much more harder and expensive to tune than it needs to be. (even if you own them now)

Two matching Edelbrock/Carter AFB's make the deal a hole lot easier and cheaper all said and done.
Whats the budget? Will he be burping the wallet for aftermarket heads or working with (reworking) a OEM junkyard cylinder head?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-17-2008, 09:42 PM
Registered User
 
Last photo:
Join Date: Jan 2008
Location: Chile
Posts: 376
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
he wants new heads,he has $5000 to do it ...or a little more
but he is not worried about it
what's the AFB's you suggest ?
he is kinda in love with a double q-jet setup i guess just for the look
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-17-2008, 10:26 PM
DENCOUCH's Avatar
Registered User
 
Last photo:
Join Date: Nov 2007
Location: Great Pacific Northwest
Age: 67
Posts: 409
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
A suggestion..

I recommend 'FBird-88's Vortec build!
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-17-2008, 10:46 PM
Registered User
 
Last photo:
Join Date: Jan 2008
Location: Chile
Posts: 376
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
are the vortec heads the ones that make too much power ?

Last edited by Calderone; 07-17-2008 at 11:06 PM.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-17-2008, 11:11 PM
DENCOUCH's Avatar
Registered User
 
Last photo:
Join Date: Nov 2007
Location: Great Pacific Northwest
Age: 67
Posts: 409
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
No, I meant what I said.

Going to the 'net for information is a somewhat risky proposition. One has to lurk and get a feel for the smart guys vs the others out there.

FBird-88 has a basic build that he recommends that requires minimum machine work, has all the right parts that work as a whole, and leaves one with $$$ in their wallet after the build.

He has spoken in the past that this build dynos at around 400 HP.

I took my just completed FBird-88 out on the road this evening and it is so much more than what I had, it is "Scary-cool".

The very first thing I noticed was how little gas pedal it takes to go fast. Rapping the throttle in the driveway and the motor tachs FAST!

This motor has an urgency about it and a ton of torque in spite of the cam grind.

I cannot say too many nice things about this Fbird-88 and his build.

If you did not give this build the consideration it deserves, well, THAT is what I would call a "Joke".
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 07-17-2008, 11:14 PM
Registered User
 
Last photo:
Join Date: Jan 2008
Location: Chile
Posts: 376
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
i replied wrong window ..i meant it for another thread
yes im watching his setup and the other thread ...
wow...maybe the vortec has something to do with it ?
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 07-17-2008, 11:57 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,153
Wiki Edits: 0

Thanks: 5
Thanked 380 Times in 374 Posts
400+ or so hp is not that hard or expensive to achieve. Even with dual carbs.
You bud needs to fall out of love with the Qjet idea thou.
How about a pair of Edelbrock thunder series AVS 650's?

How about a tunnel ram manifold? Nothing catches your attention (short of a 8-71 blower) like a Tunnel Ram pokin out of the hood.

What fuel octane will he be using?
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 07-18-2008, 12:08 AM
Registered User
 
Last photo:
Join Date: Jan 2008
Location: Chile
Posts: 376
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
here its only 93-95 and 97 octane fuel
why a NO NO for the double 4 barrel setup ?
thanks
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 07-18-2008, 12:20 AM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,153
Wiki Edits: 0

Thanks: 5
Thanked 380 Times in 374 Posts
Quote:
Originally Posted by Calderone
here its only 93-95 and 97 octane fuel
why a NO NO for the double 4 barrel setup ?
thanks
Qjets are a very refined carb for the origional OEM appliation. This fact, is much of the problem when it comes to using them on a racey motor. While they certainly can and are modifed for racing (stock eliminator, super stock class racing, hill climbing etc), the expense and effort in the end will have him seeking a divorce. It's a lot of work and detail to dial them in. The nessessary upgrade and tuning parts X2 gets nasty. a apir of AFB, AVS or Holleys will make more power with a lot less hassle.

I have a few ideas in mind. I like to recomend stuff that I know you/he can achieve and have a lot of fun with.

Should be able to do the whole car for $5000.
Do they have disposable diapers there? When I get thru with it he'll need then for his first ride...
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 07-18-2008, 12:26 AM
Registered User
 
Last photo:
Join Date: Jan 2008
Location: Chile
Posts: 376
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Oh im sorry,when i meant QJET it can be any fourbarrel carb !
what's best ASV or AFB ? Double AFB ?
thanks fbird
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 07-18-2008, 12:27 AM
SSedan64's Avatar
Registered User
 
Last photo:
Join Date: Dec 2007
Location: Macon, GA.
Age: 50
Posts: 6,016
Wiki Edits: 0

Thanks: 0
Thanked 46 Times in 46 Posts
Good 1 Fbird, "Diapers" . You don't think he'll soil himself do you?
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 07-18-2008, 06:09 AM
CNC BLOCKS NE's Avatar
CNC Blocks Northeast
 
Last photo:
Join Date: Sep 2006
Location: NORTHEAST
Age: 54
Posts: 1,441
Wiki Edits: 0

Thanks: 1
Thanked 19 Times in 19 Posts
We have built some 355's with Vortec heads that have been worked with seat cutters and a bowl howg, deshrouding and cut for 64 CC's screw in studs hyd. cam. The block was zero decked we use 6 inch rods in our builds to lighten up the pistons.

The last build with a single HP 600 carb made 432 horse and 460 ish on the torque.

Our circle track engines we use Ford flat tappet cams (solid) heads cut to 59CC's which we shoot for 11:01 and we are restrcited to a 600HP carb and we have seen 515 on the dyno and 485 on the torque.

The money you will save on buying 2 carbs and an intake manifold you put into a good lower end.

Good luck with your build Carl
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 07-18-2008, 09:16 AM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,023
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
Forget the dual carbs. Much more trouble and cost and no hp gain. All he needs is a Performer RPM intake and a holley 3310 750cfm with vacuum secondarys. Spend any extra money on a 383 stroker kit and/or better heads.

What year nova?

Easy to build 400hp. Plus, a stock bottom end will hold that with no problems Especially with a street car, that will not be at max power for long durations.

What gear and transmission is he planning to use?

Go with aftermarket or vortec heads (160 to 180cc) and a cam with around 230 degrees duration at 0.050". Edelbrock, Dart, AFR are good aftermarket heads to consider.

Hyper pistons with 9.5 to 10:1cr should be about right.

Maybe upgrade to some better rod bolts.

A 400hp 350 cid will need at least a 2800 stall and 3.73 gear.

A 400hp 383 cid will need at least a 2400 stall and a 3.55 gear.

You can build 400hp with a set of stock heads but would take a much bigger cam (240-250 degrees duration), 10.5:1 cr, and would require a 3000 stall and 4.11 gears.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 07-18-2008, 09:33 AM
killerformula's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Carburetor
Last journal entry: Clean up
Last photo:
Join Date: Oct 2003
Location: Northeast
Age: 34
Posts: 3,485
Wiki Edits: 3

Thanks: 13
Thanked 27 Times in 18 Posts
My vote is for cubes. You can stick your stock heads on there and replace them later while the motor is in the car, but you can't swap out the bottom once you get it in place! Cubes are king on the street. They give you a nice, wide power band to play with and are more forgiving with weight/tall gears.

Good luck whatever you decide-

K
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
crate chevy 302? Vancouver Grand Prix Hotrodders' Lounge 106 12-31-2012 04:05 PM
Need Help FAST!!!!!!!!!! millertime85 Engine 14 06-25-2008 07:01 PM
I need a good cam and bottom end selection for a 350!! 2506CYL Engine 2 05-23-2003 03:28 PM
Cam Help black66 Engine 3 05-12-2003 06:15 PM
building a bottom end corenele Engine 17 03-25-2003 08:06 AM


All times are GMT -6. The time now is 02:48 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.