383 block - 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 08-27-2007, 08:08 AM
Registered User
 
Last photo:
Join Date: Aug 2007
Location: ocala fl
Posts: 98
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
383 block

i went and bought a block im going to go have her cleaned up etc etc.

what do i need to clearance and how much and where?

is there a write up some where

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-27-2007, 12:44 PM
327NUT's Avatar
Registered User
 
Last photo:
Join Date: Dec 2004
Location: So. Utah
Age: 67
Posts: 3,232
Wiki Edits: 0

Thanks: 0
Thanked 70 Times in 64 Posts
There's probably a hundred or so 383 clearancing threads, you can do a search for those but you are mainly looking for rod bolt clearance in the block and clearance for the cam. Theres usually not a lot of grinding to be done and you may have to use a small base circle cam. Do a lot of research before you start putting things together so you don't have a costly mistake.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-27-2007, 01:12 PM
383silverado's Avatar
Registered User
 
Last photo:
Join Date: May 2007
Location: tucson az
Age: 35
Posts: 389
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by F3RR3T
what do i need to clearance and how much and where?

can you see the notches right by the oil pan rails on both side?



Last edited by 383silverado; 08-27-2007 at 01:19 PM.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-28-2007, 12:25 AM
Member
 
Last wiki edit: Calculating tire size
Last journal entry: Changes...
Last photo:
Join Date: Oct 2003
Location: Montreal
Age: 29
Posts: 532
Wiki Edits: 2

Thanks: 0
Thanked 2 Times in 2 Posts
My 383 didn't need any clearancing on the block, only on two of the connecting rods so they didn't hit the cam. I think it is a little different for each motor. Check out the pictures here: http://www.nastyz28.com/forum/showth...ht=stroker+101

EDIT: these are someone else's pictures not mine.

Last edited by fiscus; 08-28-2007 at 03:42 PM.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 08-28-2007, 08:45 AM
Registered User
 
Last photo:
Join Date: Aug 2007
Location: ocala fl
Posts: 98
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
correct me if im wrong but how in the hell can a rod hit the cam
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 08-28-2007, 09:13 AM
Holder350's Avatar
Auto Parts Professional
 
Last photo:
Join Date: Feb 2005
Location: Whitesburg, TN
Posts: 1,037
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
The longer rod puts it closer to the cam especially if you have a high lift. not an uncommon problem with strokers.

To clarify if you look "up" into the motor you will see that the bottom of the cam is "open" and as the con rod moves by it it sometimes hits, it shouldn't hit on the base circle of the cam but if the lift is enough you may have clearance issues.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 08-28-2007, 10:13 AM
hotrodf1's Avatar
Chasing dreams with a ball bat
 
Last photo:
Join Date: Dec 2003
Location: Evansville, IN
Age: 36
Posts: 545
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Also note:
Many H-beam con rods are "profiled" for more cam clearance to help in that area. If look at one from the side I think you will see what I am talking about.

Of course, the small base circle cams can help, too.

I did my 406 (same stroke as a 383), and had to clearence the block a little, but I had a small base circle cam and profiled H-beam rods so no problem there.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 08-28-2007, 06:17 PM
383silverado's Avatar
Registered User
 
Last photo:
Join Date: May 2007
Location: tucson az
Age: 35
Posts: 389
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
i used a standard base circle cam (1.100 inches ) because i already had it before i built my 383.and my H beam rods cleared just fine. but it wouldn't be a bad idea to go with a small base circle cam. you'll just need longer pushrods.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 08-28-2007, 07:46 PM
Member
 
Join Date: Nov 2004
Location: PA
Age: 71
Posts: 367
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by F3RR3T
i went and bought a block im going to go have her cleaned up etc etc.

what do i need to clearance and how much and where?

is there a write up some where
Assemble and the you or your machinist check clearances.

383 with SIR 5.7 rods with cap screws had no problems clearince CC XE274 cam with std. base circle. A couple of cylinders need help at th bottom of the bores (3.75 stroke). Oil pan side rails needed clearancing.

You or machinist HAS to check everything before starting the engine.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 08-28-2007, 08:09 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,785
Wiki Edits: 326

Thanks: 741
Thanked 956 Times in 806 Posts
Also check clearance between the pin end balance pad on the rod and the underside of the piston. Of course, this should be checked on every build, I'm just throwing it in while we're talking checkin' clearances. I keep a wrist pin on the shelf for this operation that I sanded down to a slightly smaller diameter so that it will just slide through the piston and rod.
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
Ok, here's the debate of the century: 383 or 400 chevy!! Cast your vote and reason killerformula Engine 303 03-28-2013 08:08 PM
the history of chevy v8's savman1 Hotrodders' Lounge 43 03-02-2012 06:57 PM
SBC Strokers - 350 vs 400 Blocks & Combos (not just 383 & 406) ez2cdave Engine 11 05-21-2007 09:34 PM
Big block questions, help please??? 67 sleeper Engine 20 05-15-2007 04:24 PM
Why would you build a 383 small block chevy 454me Engine 15 06-19-2005 07:23 PM


All times are GMT -6. The time now is 07:32 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.