Volvo RWD 120-130 Forum

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big bore kit 120-130

posted by  B20Paul. on  Mon Jun 18 15:46 CST 2018
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last visit: Mon Oct 20 10:54 CST 2014
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Do you have a big bore head to go on it?

The stock B21 pistons are strong, but they and the late B20 conrods that go with them are WAY too heavy. Would be OK if you had a heavily ported head with 45 or 46mm valves.

92mm B21 pistons is only 4.7% bigger than 3.50" +.040" and you are stuck with having to find big bore head gaskets for maybe 4.7% more torque and 0% more power using SU's and the stock head.

And... not all blocks get to +.125"!





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New big bore kit [120-130]
posted by  voice122  on Sat Jun 16 22:32 CST 2018 >


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