I had a 98 Frontier pickup with the American built KA for 4 years and the inside of the head, looking in from the oil fill hole, did not have the orange look that my japan built s13 KA has now, and i wondered if it was just my engine but all these other pics i see in forums have the orange glow too. Can someone shed light on this for me. THANKS

 

yea thats the motor i was going to get.....

its just depends on oil bro.. thats all. they one i have now is the first one i have had where its is silver inside.. no issue.