Can't figure out what crank I have - Hot Rod Forum : Hotrodders Bulletin Board -- 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
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 11-06-2005, 05:06 PM
Mad Maggot's Avatar
The lean mean donut machine
Last photo:
Join Date: Aug 2004
Location: Red Deer, Alberta, Canada
Age: 34
Posts: 386
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Can't figure out what crank I have

I have a buddy who tore apart the engine he got with an 85 Monte Carlo he had just bought. He had a bunch of go-fast parts and he wanted to rebuild the 305 that came with the car and hop it up a bit. As he tore it apart he discovered that the engine had a .030 overbore and that the motor looked like it did not have many miles on it since the rebuild as there was still hone scratches and there was no noticable ridge at the top of the bores. So, the motor had obviously been torn apart before to get rebuilt. As he took out the crank and set it on the concrete, he noticed it made a high pitched ding rather than a thud. He took a wrench and tapped the crank, and it rang like a bell. He then compared it to the camshaft which made a thud, so he automatically assumed that someone put a forged crank in it when it was rebuilt. I told him that cast steel cranks can also ring like the forged ones, and that some stock motors came with cast steel cranks as opposed to cast iron. We both agree it is not some cheap cast iron crank, but none of us are certain what it actually is as the casting number is too garbled to read. Is there any way of knowing what crank this actually is? He said that if it is a forged crank he will put it toward his circle track 355 project, and if it is cast he will just use it in his 305, so he really needs to know the difference.

Thanks for the input

- MM

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 11-06-2005, 05:23 PM
techinspector1's Avatar
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Zephyrhills, Florida, USA
Age: 75
Posts: 15,456
Wiki Edits: 326

Thanks: 1,546
Thanked 2,077 Times in 1,606 Posts
Look at the first un-machined part of the crank at the front. If it has a very thin parting line, it's cast. If the parting line looks like someone took a grinding disc to it and is about 1/4" wide, it's forged.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-06-2005, 07:04 PM's Avatar
Last photo:
Join Date: May 2002
Location: Holly, michigan
Posts: 8,990
Wiki Edits: 0

Thanks: 88
Thanked 541 Times in 470 Posts
Cast Iron cranks can ring to the untrained/experienced ear. The "thud" ones are usually cracked! As mentioned above, the parting line is the quick and dirty way to tell. Look for the line on the first crank throw
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-06-2005, 09:20 PM
347mustang's Avatar
Last photo:
Join Date: Apr 2005
Location: oklahoma
Posts: 389
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
if it is the orginal crank , no 305 crank is steal, but it is possable that some one put a 350 crank in it cause a 305 and 350 both have a 3.48 stroke
Reply With Quote Quick reply to this message

Recent Engine 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
Serious problems removing harmonic balancer! spyderdude Engine 55 06-09-2005 10:01 AM
Rebuilt engine won't crank. lt1bbody Engine 10 04-22-2005 12:44 PM
383 Crank Hits Pistons 68NovaSS Engine 17 08-09-2004 02:33 AM
crank problem Zartan Engine 17 05-11-2004 02:39 PM
crank / block combo's toddtheodd Engine 5 03-17-2004 10:38 PM

All times are GMT -6. The time now is 08:10 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 1999 - 2012. All Rights Reserved.