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Author Topic: Which heads do i have? 1986 GMC Sierra 2500 bad valve guide  (Read 1746 times)

Offline RichmondNick

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  • 1986 GMC Sierra 2500
Which heads do i have? 1986 GMC Sierra 2500 bad valve guide
« on: November 07, 2017, 08:11:38 PM »
Hello,

Can anyone guide me to know which heads i have?

Here is a vid of the valve guide
https://m.youtube.com/watch?v=XRn_v241ulk
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Offline VileZambonie

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Re: Which heads do i have? 1986 GMC Sierra 2500 bad valve guide
« Reply #1 on: November 08, 2017, 11:38:55 AM »
You need to get the casting numbers off of the head.  You already have the valve cover off so just clean the gunk and match it up http://outintheshop.com/faq/casting/heads.html
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline RichmondNick

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  • Posts: 3
  • 1986 GMC Sierra 2500
Re: Which heads do i have? 1986 GMC Sierra 2500 bad valve guide
« Reply #2 on: November 16, 2017, 04:56:18 PM »
Thank you zombie.

Going to look at a set from Craigslist tonight.

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