newbie with a question, stock 396 BBC - 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
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 01-21-2011, 05:01 PM
UNTOUCHABLE's Avatar
Registered User
 
Join Date: Nov 2007
Location: MD
Posts: 6
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
newbie with a question, stock 396 BBC

Hello to all the engine guru's, I have a stock 396 BBC from a 68 chevelle with flat top pistons and plan on adding some edelbrock performer rpm aluminum heads to it. The heads are 110 cc. also i was thinking about using COMP cam 284 h cam in it. Around how much power will these put out ? I new to this engine building stuff all help is appreciated. Also what would the compression ratio come out to ? thanks again.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-21-2011, 05:46 PM
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
Info I get says if you have flat top pistons, with stock replacement gaskets of .039 thickness and a 4.370 bore size, with 110cc chambers your compression ratio is 7.4:1 which is so low it`ll be a turd and adding more mods such as a bigger cam will only make it worse.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-21-2011, 05:51 PM
eloc431962's Avatar
Evil Wicked Mean And Nasty
 
Last wiki edit: Pilot bearing and bushings
Last journal entry: roof repair
Last photo:
Join Date: Nov 2008
Location: back in the garage.
Posts: 13,767
Wiki Edits: 37

Thanks: 50
Thanked 28 Times in 24 Posts
Quote:
Originally Posted by DoubleVision
Info I get says if you have flat top pistons, with stock replacement gaskets of .039 thickness and a 4.370 bore size, with 110cc chambers your compression ratio is 7.4:1 which is so low it`ll be a turd and adding more mods such as a bigger cam will only make it worse.
X2 with DV on this.


Cole
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-21-2011, 06:31 PM
BOBCRMAN@aol.com's Avatar
Member
 
Last photo:
Join Date: May 2002
Location: Holly, michigan
Posts: 8,240
Wiki Edits: 0

Thanks: 30
Thanked 298 Times in 278 Posts
As stock 396 engines never had flat top pistons. All low hp. had a domed piston yeilding a rated 10.25 to 1. 96-97cc chamber. Bore being 4.094 or so.. But a 110 cc head is not the way to go..
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-21-2011, 09:47 PM
UNTOUCHABLE's Avatar
Registered User
 
Join Date: Nov 2007
Location: MD
Posts: 6
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
ok thanks for all the much needed info. did all 396 bbc's come with domed pistons or no they didn't ? how can i tell my exact engine specs ? Would i have to break down the engine completely or would any of th numbers tell me exactly what i have ? i have the 7 digit code if needed.

all help is greatly appreciated thanx.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 01-21-2011, 09:57 PM
UNTOUCHABLE's Avatar
Registered User
 
Join Date: Nov 2007
Location: MD
Posts: 6
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Never mind I see I need the engine code stamping numbers. As soon as I retrieve all the needed numbers/info I'll post exactly what I have and go from there. thanx again to all fo the help.

Last edited by UNTOUCHABLE; 01-21-2011 at 10:09 PM.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 01-22-2011, 04:09 PM
1971BB427's Avatar
Registered User
 

Last journal entry: Latest changes
Last photo:
Join Date: Dec 2010
Location: Portland
Posts: 2,109
Wiki Edits: 0

Thanks: 20
Thanked 376 Times in 333 Posts
Yes, all 396's came with domed pistons. They were at least 10.25:1 CR and up to 11:1 CR.
Even if you ordered aftermarket pistons of a lower ratio they will still be domed with the pin located to lower CR. I rebuilt a 69 396 and changed to 9:1 CR and the TRW forged pistons looked exactly like the old 10:25 pistons. I thought they screwed up, but noticed the pins were higher to lower CR.
I agree with BOBCRMAN, don't go with 110cc heads.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 01-22-2011, 11:23 PM
UNTOUCHABLE's Avatar
Registered User
 
Join Date: Nov 2007
Location: MD
Posts: 6
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I really didnt want to do too much internally to the engine. I wanted more so bolt-on's. Whats the best bolt-ons to make a nice running 396. Its going in a 67 impala ss thats made for cruising. I gotta turbo 350 tran sand I will change out the rear gears to what ever is best. Igain thanks for all the help I learned alot!!
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 01-23-2011, 04:25 PM
1971BB427's Avatar
Registered User
 

Last journal entry: Latest changes
Last photo:
Join Date: Dec 2010
Location: Portland
Posts: 2,109
Wiki Edits: 0

Thanks: 20
Thanked 376 Times in 333 Posts
Unless you're building a race engine, I'd never consider buidling any big block for operation over 5,000 rpm's. It's just not needed or good for a big block used mainly on the street Most street driving will be used in the lower rprm power band, so building your 396 for off idle to 5,000 is the way to go.
Stick with a good dual plane intake, and a vacuum operated 750 carb.
If you don't want to get too deep into the engine then don't even change the heads, unless they need work, and then just have the stock heads gone through. I'd sure go with steel roller tip rockers, but stay with a flat tappet hydraulic cam/lifter set. Don't need much internally for a good performing cruiser, and with the right cam, intake and headers you can easily get 350 HP. Heck, the stock 4 brl. version was 325 HP, so another 25 horse is easy!
For rearend gears I'd go with something in the 3:42 to 3:56 range. The 396 doesn't need to be wound too tight cruising down the highway. I'm running 3:42 in my '71 Camaro, and it's a great highway car, with plenty of stoplight power too.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 01-25-2011, 08:36 PM
UNTOUCHABLE's Avatar
Registered User
 
Join Date: Nov 2007
Location: MD
Posts: 6
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
1971BB427 based on therecommenddations u gave me what would be a good cam and torque converter. I want decent power from it and a nice healthy lumpy idle also. I have 215. heads on it by the way if that helps any. Thanks for all the help from every one its greatly appreciated!!!!
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 01-26-2011, 07:23 PM
1971BB427's Avatar
Registered User
 

Last journal entry: Latest changes
Last photo:
Join Date: Dec 2010
Location: Portland
Posts: 2,109
Wiki Edits: 0

Thanks: 20
Thanked 376 Times in 333 Posts
I'm running a 288/284 duration with .530 lift, 114 degree in my 427, and that would also be great for your 396. It's got plenty of lowend power, and good to around 5500 rpm right off idle. No special high stall converter required with a automatic.
Here's what it sounds like:
Reply With Quote Quick reply to this message

Recent Hotrodding Basics 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stock carb question! Bubbas Garage Engine 2 11-03-2010 12:15 PM
Stock TH700R4 Durability Question Zeeb Transmission - Rearend 2 09-09-2009 04:45 AM
stock 350 piston question? suprstock Engine 5 01-01-2009 05:51 PM
96 to 00 5.7 Stock GM Rod Question Mustangsaly Engine 24 11-28-2006 10:23 PM
question about stock camshft oaklandfan81 Engine 3 10-06-2006 06:20 PM


All times are GMT -6. The time now is 02:18 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.