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Hi i want to make a 1.6vvc engine I'm just wondering what gearbox will I need to handle the power? Or will the standard gearbox that comes in a 1.4 105 mg zr last?
 

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'06 MG ZR +120 (HQM) '04 MG ZR 105 (IAB)
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I would start by verifying which gearbox is fitted to your ZR 105. Until April 2003, the 105 was fitted with the R65 box, which is known to be less than robust, and is certainly unlikely to tgake kindly to the sort of power throughput you are talking about.

From 1st April 2003 (Rover 25 or MG ZR with a VIN/serial number 720773 onwards), cars with the petrol K series engines of 1.6 litres and below were matched to a Getrag-Ford IB5 gearbox, which is more robust than the R65 and I would expect to be capable of handling the kind of power that you are aiming for.
 
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