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706 and 862 heads, are they interchangeable?

Tiny
HD1200
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 236,000 MILES
I’m rebuilding my 5.3 ls engine in my truck listed above 1500. I have one 706 head that has been rebuilt and one 862 head that has been rebuilt. Are they exactly the same only difference is in casting? I’ve seen online that they are but also 862 has higher compression. So, I am not sure if that would work and if I should get another 706 or 862 head to make the heads match but I'm trying to do budget build.

Thanks
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Tuesday, November 21st, 2023 AT 4:39 AM

3 Replies

Tiny
MONSTERTRUCKDADDY
  • MECHANIC
  • 31 POSTS
Hello HD1200,

If the combustion chambers CC are the same, and the spring installed heights are the same, and the pushrods end up being the same... you might be able to get away with it on a budget build. It's a lot of work to get to that point to find out you may need another 862.

Are you sending them out for any machine work? I'm guessing 'budget' build indicates "no".

Here's a great article that spells out the differences:

https://www.alliedmotorparts.com/blogs/news/are-862-heads-a-better-choice#: :text=While%20862%20heads%20are%20sand,between%20706%20and%20862%20heads.

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Tuesday, November 21st, 2023 AT 7:10 AM
Tiny
HD1200
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  • 61 POSTS
Okay, thanks.
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Tuesday, November 21st, 2023 AT 8:27 AM
Tiny
KEN L
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Thursday, November 23rd, 2023 AT 8:59 AM

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