Military/J-Code Heads?

[welpro222]

Whats the casting number for the Military or J-Code Heads for the 6.2?

 

[TCUCV]

I believe anything after '87 on civilian trucks are j code, not positive though. I would check the TM and cross reference with Napa or Advanced

 

[rnd-motorsports]

Gm started to build the 6.2 J code in 1982 any truck with non emissions - 1 ton , 3/4 ton truck and 3/4 ton suburbans and vans would have the J code they are not just a military use engine just a non emissions engine no EGR.

 

[welpro222]

I know all this but I was wondering if anybody knew the casting numbers for the j-code heads?

 

[Roadrunner 161]

Since both of my heads are in the back of my 1986 M1009 right now I can give you what is on them.

GM10
GO86
14077162

Hope this helps.

 

[patracy]

The secret is in the sauce...

Don't buy too much into the J code thing. Blocking off a EGR'ed 6.2 is basically the same effect. Heck I used to be on a GM diesel forum and swapping in a J code intake manifold was the "in" thing to do.

 

[southdave]

Thought j code had to with the intake

 

[hre513]

Thought I seen some where the castings are the same. The pre-combustion chamber cup openings were different sizes.