Can anyone give me an idea as to what to look for in upgrades for the M70 motor? I was just wondering due to the conversion I am doing, what I should look for to replace/ upgrade on the motor.

Look for parts for an m20 because they are exactly the same but you have two of them. For example the performance headers that fit an m20 fit a m70 just you need to specially make the other side.

Look for parts for an m20 because they are exactly the same but you have two of them. For example the performance headers that fit an m20 fit a m70 just you need to specially make the other side.

Uhm, "just" and "specially" are essentially opposites here, at least cost-wise...

Okay bad choice of words but my point still stands.

Thanks, but what would you recommend I look for?

How far do you want to take apart the motor?

Because I have a link for some very good cams (http://www.vacmotorsports.com/cgi-bin/special_view.pl?man=Schrick) and a stroker kit to make the V12 5 Liter to a 5.4 Liter. Then if you want some forced induction Vortech makes a great supercharger kit which you would need two of; one for each side.

I don't think I'll tear into the motor, and when it says "Call" for pricing, it kind of worries me. I think I'd like two Turbos, one for each side. What is the preferred brand for turbos, and what can I get for not so much money?

Yeah, "call for pricing" scared me too at first and even worse when I found out that they want $1,400 for a set of two. But I was talking about the M20 cams because they fit and have the right firing order, plus they are only $420 per and have a better angle for more performance.

I don't know about any turbos for these cars but I have heard, from my BMW mechanic, that these motors really suffocate at the top end not bottom. So I would go with two Vortech superchargers, one for each side.

If they suffocate at the top end rather than bottom, wouldn't I want to put turbos in since they add air at the top? That confused me. Which Camshaft would I want? Would the 304 break anything? By Race, does it mean it cannot work properly in daily traffic, or just mean suck down gas? Or should I just go with the 284? I really have no idea. This will be my daily driver, so I don't need it to blow up on me, though gas guzzling does not bother me a bit. (also, I still want the turbos because I want to hear them)

twin turbo would be awesome.

Heres some linkage so you can start looking into it:

http://forums.bimmerforums.com/forum/showthread.php?t=772754&highlight=750il+turbo
http://www.m5board.com/vbulletin/archive/index.php/t-18599.html
http://youtube.com/watch?v=J_6OedKNUX8
http://youtube.com/watch?v=cc80tfQvvSc&mode=related&search=
http://youtube.com/watch?v=H4gWUlXTewc&mode=related&search=
http://youtube.com/watch?v=gJg-i3leR4g

I thought I would find more links :(