Can i swap cylider heads of hyundai elantra j2 regardless of engine numbers , capacity and year models

indicates that there is a major problem in the cam shaft bearing alignment
This is generally from having the head machined at some point of time to remove a wapage and when properly torqued down the bearings are no longer in alignment
( sort of like trying to make the solid shaft run in an arc)
If the bearings are in individual posts bolted to the head , the fix is to have both the gasket face machined and then the head turned over and the posts faces machined
If the bearings are part of the head then the bearings have to tunnel bored and oversized bearings used
In that case it is generally cheaper to get a new head
Talk with an engine reconditioning shop as to the best method of fix

• Hyundai Elantra - The total towing capacity of the Hyundai Elantra is 3,086 pounds. It isn't much by the typical truck standards, but the Elantra is a very well-priced truck overall. The Elantra can carry 1,000 pounds more than full-size sedans like the Cadillac DeVille and Mercury Grand Marquis.

thats got a cracked head get a preasure test done on head

The engine ID number is above the trans, printed on the block, below the head. There may be a emission decal under the hood showing a J1 or J2, if you call the Hyundai Parts dept with your VIN number they should be able to tell you.

Go to www.hmaservice.com and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop manuals, service bulletins, illustrations, etc.

Tightening torque

Cylinder head bolt [cold engine] . . . . . . . . . . . . . . . . . . . . . . . . . . .

105-115 Nm (1050-1150 kg.cm, 76-83 Ib.ft)

cylinder head bolt torque

10 mm bolts

step 1 22 ft lbs
step 2 additional 60 degrees
step 3 additional 60 degrees

12 mm bolts

step 1 26 ft lbs.
step 2 additional 60 degrees
step 3 additional 60 degrees

exhaust manifold nut 32-41 ft lbs.

intake manifold nut 11-15 ft lbs.

rocker cover 71-86 in. lbs.

What you need is a Haynes Repair Manual, that will help you search for it, as for where to download try a torrent site like BT-Junkie or Torrentz.com.
Sorry I could not help more.

dear friend:here follows the settings in need:
cylinder head-30-35 nm + 30-35 + 65deg + 65deg.
mains-30nm +65deg
big ends- 1 - 26nm 2 - 52NM
fly-wheel -130nm
cam-sprocket - 100-120
crank-pulley - 170-180
cam caps -15nm

1st stage 45lbs then 65 then 85

Most of the Public Libraries have all Hyundai manuals