Re:How can you tell.
 

that information is wrong on a few things.

first off, the PM8 HF ECU rev limits at 5400, not 6800.

*ALL* HF's, 88-91 had MPFI injection.

And yes, the HF's were 8 valve, with the bottom end having a very slight domed piston with only 8 valve reliefs... totally different than any other d series 1.5L engine.

Re:How can you tell.
 

and the compression is 9.6:1, not 9.1:1

and the torque was 90 ft.lbs. at 2000rpm.
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Re:How can you tell.
 

blah blah, HF had blue interior. Si had an ELECTRONIC sunroof. Also the Si says "CRX" on the door panel's.

Si's also have seats similar to the integra's with the hole in the head rest. DX/Hf had normal looking seats.

if the exhaust is stock. the Si had two tail pipes. HF has the catalitic convertor hanging infront of the engine.

anyone else?