Hi if anyone has info on a stroker build. I have a m50b20 thats going to be bored to a b30 stroker. my question is, would I able to use the head from the m50b20 for the stroker build? or should i source for a different head, if so what head?
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A quick search would tell you that it will fit, but the valves are smaller, so it is a bad idea. Use a B25 head.
https://www.realoem.com/bmw/enUS/sho...diagId=11_6018
https://www.realoem.com/bmw/enUS/sho...diagId=11_4860
You may want to research the cams too, the B20 cams may be worth keeping even if the small port head is a terrible idea for performance. Oh and don't use an 89.6mm crank unless you aren't planning on revving much over 7,000rpm, I have never seen any evidence that a high revving engine with that crank lasts and plenty that it does not (torsional vibration). I just built one myself
IG @turbovarg
'91 318is, M20 turbo
[CoTM: 4-18]
'94 525iT slicktop, M50B30 + S362SX-E, 600WHP DD or bust - updated 3-17
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