How to tell if my engine is BP or B6?

[JayJohnson600]

I have a 1990 Miata with original engine.

How can I tell if it is a BP or B6 engine?

(So I can get some headers)

Jay Johnson

[Rogue]

CAS on the passenger side is a B6, CAS on the Driver side is BP.

[QuantumBeep]

If your engine is the original 1.6, It's a B6. The only BP 1.6 engines were the detuned ones sold with 94+ automatic-transmission Miatas.

This information was found on Wikipedia and should be taken with a pound of salt.

[sammm]

^I'll take Rogue over Wiki in this case.

[driftdevil]

There was never a 94+ with a 1.6 unless it was an overseas car. US models were all 1.8 car from 94 and up.

[QuantumBeep]

Interesting. I'd heard about that funky 90HP detuned 1.6, but never knew it didn't make it over here.

[JayJohnson600]

Thanks for the info.

Craigslist had an ad for headers, $100 both B6 and BP. I picked up a set, but it had a crack so the price moved down to $75.

I can weld it, but it's just a slight pain installing it, tacking, then removing for full weld before final installation.
Maybe I can get away with doing a full weld on first install, we'll see.

Jay Johnson