6.2 J code?

[muddybuddy]

whats different about a J code from other 6.2's?

 

[84CUCV]

I think there is two. c and j code. c has a round egr thing in the intake not sure how all that works none of my trucks have that. j code witch i think is on all cucvs 6.2s like the ones i have. Does not have the egr. i think it came in 1ton trucks for the most part. someone will please let me know if i am wrong.

 

[afroman006]

Yup. C codes have EGR which recirculates some exhaust gas through the motor to improve emissions and rob power. J codes have none of this crap. As far as I know the intake manifold is the only difference between the two.

 

[muddybuddy]

oh alright cool. thanks

 

[imiceman44]

I heard that the heads or valve sizes are different too on the J code but I can not confirm.
I also have seen more variations but have no idea what they are:
There is a dual plane J code and a single plane J code intake.
I have also seen a high rise and low rise intake, maybe from the hummer or Van 6.2 l.

 

[84CUCV]

ididnt know any of that

 

[afroman006]

There are single and dual plain intakes for J codes. I have been told the single planes are a little mo-betta. There are also "low-rise" intakes but they also have the aircleaner stud holes rotated 90 degrees and yes they are from hummers.

 

[colbystephens]

i'm pretty sure the j code is only single plane. this and the no-egr is what makes it j code. the j code engines did not have different heads/valves etc.

 

[tRustyK5]

I've seen GM literature specc'ing the 'J' code as having larger valves. My 'J' code intake is 'dual' plane.

Rene

 

[84CUCV]

So what are the cucvs? What is duel plane or single for that matter? thx

 

[afroman006]

i'm pretty sure the j code is only single plane. this and the no-egr is what makes it j code. the j code engines did not have different heads/valves etc.

Wrong. J codes are most deffinately dual and single plain. I'm prety sure they switched to the single plain in 88 or 89 but not possitive. All CUCV's are J code and every one I've seen has the dual plain.

 

[colbystephens]

ok, thanks for the info.

 

[84CUCV]

thx for the info

 

[tRustyK5]

Wrong. J codes are most deffinately dual and single plain. I'm prety sure they switched to the single plain in 88 or 89 but not possitive. All CUCV's are J code and every one I've seen has the dual plain.

X2

Rene

 

[rich]

Check out the J-code intakes here:
http://coloradok5.com/forums/showthread.php?t=144936&highlight=intake

It doesn't show the C-code intake though.