MarineEngine.com - Your online store for all types of marine engines and boat parts.
PHONE ORDERS
Monday - Friday
9:00 AM - 5:00 PM EST
Click for TOLL-FREE Number
Online Checkout
Special $9.95 Flat Rate Shipping
(800) 209-9624 | Home | Contact | Shipping | Returns | Cart View your shopping cart.
Part Number Search
Shop by engine/drive part number.
Original & matching parts for sale.
Manuals & Accessories
Shop by description, item number
or manufacturer's model number.
Boat Repair Forum Boat Repair Forum   Boat Video Gallery Video Gallery
   
Click for Chrysler parts and manuals!
Results 1 to 4 of 4
  1. #1
    Join Date
    Jan 2010
    Location
    Palatine, IL, USA
    Posts
    2

    Default 1972 Chrysler 440 - Need Leaded Fuel?

    I am trying to understand if my "new" 440's need leaded fuel. Can anyone help?

    Thanks.

    Skiperbob

  2. #2
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    12,505

    Default Re: 1972 Chrysler 440 - Need Leaded Fuel?

    Mopar went to the hardened seats (for non-leaded fuel) about 1974. If your motor has been living without lead additives for some time, then it either doesn't need it (which I've heard is true) or the damage has already been done.

    Jeff

  3. #3
    Join Date
    Apr 2010
    Location
    Keuka Lake, NY
    Posts
    27

    Default Re: 1972 Chrysler 440 - Need Leaded Fuel?

    I had a valve job done on my 1971 Chrysler 440 last year, and the motor had been runing unleaded gas for more than 2 decades. I had them put in hardended valve seats 'just in case', but the machinist said the old valves & unhardened valve seats had no signs of damage from running unleaded gas. As for the octane and knocking: The 440's were fairly low compression to begin with, so knocking is not usually a probelm so you should not need lead for that. Also, the ethynol they keep sneaking in there, actually increases octane. Ethynol has less energy per gallon than gasoline, but it actually makes octane go up when mixed with gasoline.

  4. #4
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    12,505

    Default Re: 1972 Chrysler 440 - Need Leaded Fuel?

    Great news! There's nothing like real world experience.

    Jeff

Similar Threads

  1. 1972 Chrysler 99hp same as wards 1972 seaking 96
    By ts7424 in forum Chrysler Force Outboard Forum
    Replies: 1
    Last Post: 08-23-2009, 06:34 PM
  2. Help with leaded or unleaded fuel
    By mike12 in forum OMC Sterndrive and Inboard Archive
    Replies: 9
    Last Post: 06-06-2007, 04:27 PM
  3. Leaded or unleaded fuel
    By alan the roofer in forum Johnson Evinrude Outboard Archive
    Replies: 1
    Last Post: 02-21-2007, 08:34 PM
  4. 1972 Chrysler 70hp
    By Jason P. in forum Chrysler Force Outboard Archive
    Replies: 2
    Last Post: 04-16-2004, 07:05 AM
  5. 1972 Chrysler 70HP
    By Greg Salisbury in forum Chrysler Force Outboard Archive
    Replies: 0
    Last Post: 09-01-2003, 10:00 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •