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Old 08-16-2015, 04:00 PM   #1
2nd Gear Member
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Join Date: Jul 2013
Location: Markham
Posts: 142
Stroker or m20b25

I current have a m20b20 head and a m20b27 block is this a good combo for a N/A build will it produce better numbers then a m20b25 which I also have sitting in my garage? or do I use the m20b25 head instead of the b20 head???? want to know what is better I blew my m42 and want to go m20 all help is appreciated!
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Old 08-17-2015, 10:39 AM   #2
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Location: London
Posts: 441
I'd do the b27 bottom end/b25 top end.

Or take it a step further and get some 10:1 pistons to use with the 2.7 crank and 135mm rods.
"She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself. " - Han Solo
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Old 08-19-2015, 08:24 PM   #3
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doing the combo with the 10:1 pistions what kind of gains would I get over just using the b27 bottom end/b25 head?

also where would I source these pistons?
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Old 08-21-2015, 08:21 AM   #4
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Overall you will get some hp gains but don't expect you have a bit more displacement and the 2.7 block has a better torque band.

don't forget you will also need the b25 dme and wiring harness

I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 08-28-2015, 11:56 PM   #5
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search r3vlimited under engines/m20. I've found a post there that has a lot of info you would be interested in.
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Old 08-31-2015, 12:47 AM   #6
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ok will search on r3v for sure and i already have b25 dme and wiring harness!
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Old 10-05-2015, 11:22 PM   #7
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I have an extra comp and harness if you need that shiz
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