I have two 2004 MSM heads. Different

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02-12-2018, 03:28 PM

IcantDo55

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I have two 2004 MSM heads. Different

One hads casting number "B P 1" other is "B P 2"?
What's ddifferen?

02-12-2018, 03:42 PM

18psi

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the casting

02-12-2018, 03:45 PM

IcantDo55

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Quote:

Originally Posted by 18psi

the casting

I see. Anything in the shape of the casting other than the numbers ans letters?

02-12-2018, 03:52 PM

18psi

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Are you typing on your phone? My spelling **** senses are tingling.

...Dimensionally and functionally same

02-12-2018, 03:54 PM

IcantDo55

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Quote:

Originally Posted by 18psi

Are you typing on your phone? My spelling **** senses are tingling.

...Dimensionally and functionally same

Yes and thanks.

02-12-2018, 08:14 PM

albumleaf

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Quote:

Originally Posted by 18psi

Are you typing on your phone? My spelling **** senses are tingling.

...Dimensionally and functionally same

Likely functionally the same but I would guess you'd have a bimodal distribution of points if you measured the critical dimensions of a population of heads. Not that they'd be way out, but you can't just assume they're the same.

(for all intents and purposes they're probably the same.. maybe some Spec Miata folks actually care about the head castings)