Greetings

I pulled the head on my '81 B21F because I was loosing coolant into #3 cylinder. I also found #1 exhaust valve cracked. So I called around hoping to find a rebuilt head in stock somewhere so I could make it a 1 day job. Could find only one, at a Independent Volvo shop. I described the head in response to questions I was asked, and was told I had an MPG head, though my car uses Bosch ignition. I was quoted a price of $1800 rebuilt! but he would give me a deal and sell it for $800. Said it was a very rare bird, only made one year, etc.

I didn't go for it, but this raises a question. My cylinder head has 4 sensors plus the water outlet all on the intake side. According to this shop, this makes it an MPG head. Is this true? Someone could have put this head on this car somewhere along the line? If it's not the original head, wouldn't some additional wiring and a different computer be put in as well?

What's up?

Thanks for enlightenment

Scott