# Best B-Series all motor combo

**URL:** <https://forums.speedlife.net/t/best-b-series-all-motor-combo/68540>\
**Category:** NYSpeed Automotive\
**Created:** [May 31, 2009, 9:44am UTC](https://forums.speedlife.net/t/best-b-series-all-motor-combo/68540 "2009-05-31T09:44:47Z")\
**Posts on this page:** 2\
**Page:** 5

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**Author:** ![deebo](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/deebo/32/5218_2.png) [@deebo](https://forums.speedlife.net/u/deebo)\
**Post date:** [July 6, 2009, 9:27pm UTC](https://forums.speedlife.net/t/best-b-series-all-motor-combo/68540/81 "2009-07-06T21:27:19Z")

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i believe it has to do with the surface area and the actual dome itself, because of the castings used for the pistons

it’s hard to explain, i have an analogy but i don’t feel like typing it lol

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**Author:** ![rage87](https://avatars.discourse-cdn.com/v4/letter/r/9e8a1a/32.png) [@rage87](https://forums.speedlife.net/u/rage87)\
**Post date:** [July 6, 2009, 10:11pm UTC](https://forums.speedlife.net/t/best-b-series-all-motor-combo/68540/82 "2009-07-06T22:11:34Z")

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Well I guess with typical B-series builders I see how that could work since there are so many different heads and pistons. People are always mix-matching heads and pistons to the point where the extra bore doesn’t increase CR just because the dome isn’t ideal for the head they’re using.

That’s the only way I can see it being possible. But all things the same, bigger bore = higher cr.

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