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General Category => General Discussion => Topic started by: ArcticInvader on April 10, 2021, 08:36:56 PM

Title: 80 LTD piston question
Post by: ArcticInvader on April 10, 2021, 08:36:56 PM

Hi guys, I am rebuilding my LTD motor 4/6 and when I tore down the previous owner must’ve put a piston and gasket kit in it ..two different pistons in this ;one piston top ring is upside down L-shaped at the top ,the piston pins are at 6o’clock and 4 o’clock and the other piston is at 12 o’clock and 2 o’clock and it’s not L-shaped..
   Any input would be greatly appreciated or pictures I’m also looking to buy one piston and possibly a cylinder please PM me if you like .
thank you ArcticInvader

Title: Re: 80 LTD piston question
Post by: Interceptor398 on April 11, 2021, 03:01:39 PM

Invader and 4/6 pistons are the same except for the ring end gap locations.  The top rings that style are called a "dykes" rings if I remember correctly. Not sure why they called it that.  Many have just used Invader piston and I have heard of too many problems from doing that but it still a second choice in my mine.

Invader piston is one the left---4/6 on the right.  A genuine 4/6 piston is # 13001-3011 and when new will have a coating to assist with the break in of a new engine.

Title: Re: 80 LTD piston question
Post by: ArcticInvader on April 11, 2021, 04:25:33 PM

Thanks interceptor 398 ,
 That makes more sense to me now .

Title: Re: 80 LTD piston question
Post by: ArcticInvader on May 05, 2021, 08:04:19 PM

Hi Guys,
 I am in need of one 1980 4/6 LTD piston  , I would like to replace the 440 invader piston that someone put in it when I bought it.
Thanks ArcticInvader

Title: Re: 80 LTD piston question
Post by: gixxer6 on May 06, 2021, 07:41:48 AM

I might have a good used one. 

Title: Re: 80 LTD piston question
Post by: ArcticInvader on August 24, 2021, 07:35:17 PM

Hi guys,

  Can any of you guys look in your basements or a box of the parts I’m still need a piston thanks

Title: Re: 80 LTD piston question
Post by: Interceptor398 on August 24, 2021, 07:51:00 PM

The real ones are very hard to find.  The only real difference is the ring location pin between the Invader and the 4/6 pistons but that is little help.  I hope to retire from from my normal day job next year and hope to have time to make some of the odd ball items.  Wish me luck!

Title: Re: 80 LTD piston question
Post by: ArcticInvader on August 24, 2021, 07:57:17 PM

Absolutely, I wish you luck on your making NLA parts . I’m a buyer for sure.

Title: Re: 80 LTD piston question
Post by: Lloyd (ljm) on October 17, 2021, 09:46:34 AM

 Just to throw a curve into your search
 The aftermarket SPI pistons for an Invader may or may not have the pins in the correct spot for a 4/6.

 I have tried different ones.    Some the ring ends don't travel over the ports   some they do.