uhm...its kinda blurry


as far as I know for the japanese domestic market :


D15's came in two trims:

D15B VTEC
D15B twin carb

im ruling out that you have a twin carb engine. but since you said you dont have VTEC, im not even sure if this is a jdm motor or a frankenstein setup.

my best guess is a JDM D15 block with a US D15 (dx) head ??