sbc 406. Want to build a stroker motor out of it - 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 05-26-2012, 10:18 AM
Registered User
 
Join Date: Apr 2011
Location: oklahoma city,ok
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
sbc 406. Want to build a stroker motor out of it

i have a sbc 406..im looking to rebuild it to make a stroker motor but not a 377 what do i have to do? thanks for the help..

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 05-26-2012, 12:02 PM
327NUT's Avatar
Registered User
 
Last photo:
Join Date: Dec 2004
Location: So. Utah
Age: 68
Posts: 3,292
Wiki Edits: 0

Thanks: 0
Thanked 91 Times in 82 Posts
????????????? Ok, normally you install a larger stroke crankshaft in an engine to GAIN cubic inches. You say you have a 406, so that's a 400 + .030 bore, the 400 is a block that can't safely be bored more than .030 w/o running into problems.

You're only alternative with this block is to buy an aftermarket ($$$$) larger stroke crankshaft which will require aftermarket ($$$$) connecting rods and pistons....among many other things. I think the most you can go is 434 but most guys go for a 421. Basically it's a LOT of money for not a lot of extra performance. You need to do sme research prior to making a decision, you can do a search function on this forum also for this modification.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 05-26-2012, 05:07 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
There a a lot of different ways to skin that cat.
Make the crankshaft stroke longer.
But your "bang for the buck" performance return on investment
won;t be very good if some other component like the cylinder heads, exhaust system etc is the more performance limiiting factor.
if you don't already got really good cylinders heads etc now,
keep your expectations modest.

If are after more than just brag ing rights.

You can replace the crank with a longer stroke "stroker crank"
You can offset grind the rod journals on the 400 crank to increase the stroke and use a smaller rod end diameter and rod bearing.
You can adjust the length of the connecting rod or change the piston pin location to maintain the same piston compression height in the block.

Increasing the crank stroke will also increase the compression ratio
unless you compensate for that.
The rods will get closer to the cam lobes, bottom of the cylinders and oil pan raids in the block, requiring more clearanceing. or a aftermarket block.

Its not cheap or bolt in easy.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 05-26-2012, 08:15 PM
1BAD80's Avatar
The Smell of Nitro in the morn
 
Last wiki edit: How to adjust valves Last photo:
Join Date: Jun 2001
Location: Mich
Posts: 2,423
Wiki Edits: 2

Thanks: 0
Thanked 3 Times in 2 Posts
A 400 with a 4" stroke is a 427 like in the new Chevy motors.
Like F-BIRD'88 said there are other things you need to make it run, esp some good heads
Save and get what you need in quality parts or it will nichol & dime you more than getting the right combo to began with.
In the Knowledge Base there is a site called Ryans Place and he gives different combos just for some ideas and what you will need to make it run.
__________________
Luv the smell of NITRO in the morning.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 05-27-2012, 01:52 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 okc87ssmonte
i have a sbc 406..im looking to rebuild it to make a stroker motor but not a 377 what do i have to do? thanks for the help..
Leave it a 400 (plus whatever overbore may be needed needed) and concentrate on the top end- that's where the power is. Make the bottom end as durable as you can afford (think about after market rods 5.7" or 6", freshen up the stock crank, new pistons- forged if you are really going to lean on it or use nitrous, bearings, timing set, oil pump, gaskets, etc. and let that tell you how much rpm you want to run (a red line of 6000 rpm will still be enough to make good power). Choose a cam based on the engine bottom end and the rest of the vehicle, i.e. gear ratio, stall speed, weight, intended use, etc.

Remember- the engine is only one part of the whole. The rest of the vehicle has to be up to the task or all you will end up w/is an ill-mannered, tire shredding parts breaker of a money pit. Do it right and you can enjoy a 12-second ET capable high performance vehicle that can be daily driven and that's a joy to drive.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 05-27-2012, 07:14 AM
Registered User
 
Join Date: Nov 2011
Location: Virginia
Posts: 705
Wiki Edits: 0

Thanks: 0
Thanked 75 Times in 75 Posts
We've built a few of the 4" stroke versions. They "refer" to it as "427" in an attempt to tie it to the "real" 427 of yore. TOTALLY different animal. In reality, it more closely resembles the Ford and Pontiac 428s (bore/stroke, 4 1/8" x 4"). It's more of a "smaller bore, longer stroke" type than 427, as are the LS engines. (for clarity and separation from the Mark IV "big block" 427, 4 1/4" x 3 3/4")

I really "like" the 412 "kit" Eagle sells. The stroke is only a little longer at 3.8". But the crank is tuff stuff.

Agreed with Cobalt327, the factory crankshaft is up to the task. It's a good nodular casting. I wouldn't recommend any of the aftermarket castings for any more than pickup truck use. Using the word "steel" is misleading. In our business, a "steel" crankshaft is forged, not cast. MANY good forged cranks available for this.

GOOD cylinder heads are imperative. The 400 block is flimsy enough without adding cheesy castings to the top. Iron heads can make a big difference for a street engine's durability. The valve train must also be first-quality for the same reasons. Any and everything you can do to "stiffen" the block is a good thing. "Filling" (like "HardBlok") isn't a bad idea, but requires the use of a remote oil filter and external oil cooler to be safe. Most of the combustion heat is in the top 1" or so, but the oil can't reach the water jackets "up top". Using a cooler "fixes" this issue. Start with a 2-bolt block!!! If you install 4-bolt caps, be certain they're of the "splayed-bolt" type, NOT the "straight". The outboard bolts in the "straight" version go right into the already weakest part of the block. The splayed-bolts draw into the "V", the strongest part in the area.

Your HP and torque "requirements" will determine the "level" of parts you need to make it "go" and make it "live". What's it going in and what do you want it to "do"?

Jim
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 05-29-2012, 07:20 AM
Registered User
 
Join Date: Apr 2011
Location: oklahoma city,ok
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
its a street car.right now it has cast heads with 202/160 it also has 373 rear end..i was thinkin around 411 416 ci. im just not sure what to do...
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 05-29-2012, 07:22 AM
Registered User
 
Join Date: Apr 2011
Location: oklahoma city,ok
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
the cam now is a 480/280
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 05-30-2012, 10:45 PM
1******72
 
Join Date: May 2012
Location: bend oregon
Age: 20
Posts: 3
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
keep 400

keep the 400 a 400. my experience is that the more cubes you have the more power you have. why would you wanna de stroke a 400 to say a 383, thats less cubes!
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 07-18-2012, 06:57 PM
Registered User
 
Last photo:
Join Date: Jul 2012
Posts: 42
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
completed balanced sbc 406 forged rotating assembly 10.3.1 14cc dish piston 30 over 4.155 bore 6'' rods Skip white perforance
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 07-25-2012, 05:58 PM
Registered User
 
Join Date: Apr 2011
Location: oklahoma city,ok
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
its in a 87 ss monte i just want a solid street car
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 07-25-2012, 09:20 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
Quote:
Originally Posted by okc87ssmonte View Post
its in a 87 ss monte i just want a solid street car
Thats a broad vague statement. define what you really want from the car.

Going from 406cid to 411cid will not add anything (especially with crappy stock heads)

the power potential of a motor is in the cylinder heads.

If yu re using a stock chevy head there are big gains to be had with better aftermarket high flow cylinder heads.

Start by determining what you got now.
What is the cylinder head casting number?
what pistons? dished , flat top, domed?
find the casting number under the valve cover.
Reply With Quote Quick reply to this message

Tags
406, chevy

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
Wanting to build a 406 sbc White85Camaro Hotrodding Basics 18 03-28-2012 12:50 PM
406 sbc build how will this combo do 81malibuman Hotrodding Basics 11 04-24-2011 08:55 PM
406 sbc, build questions manchildau65 Engine 59 04-03-2010 06:59 PM
Critique my 406 SBC build Chevtec Engine 9 03-13-2010 02:37 PM
406 sbc build need cam advice TCAMARO Engine 22 05-03-2005 12:26 PM


All times are GMT -6. The time now is 03:58 AM.


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.