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Oversize pistons on Jaguar 4.2 supercharged v8 (AJ33S)

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Old Nov 21, 2025 | 09:00 AM
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From: stroud
Default Oversize pistons on Jaguar 4.2 supercharged v8 (AJ33S)

Hi all,
Not sure if I've posted this in the correct area in the forum so apologies if not... But we currently have a 4.2 supercharged jaguar v8 from a 2005 S-Type R (I believe) that we use in our 4x4 off road race car. We have currently got it stripped down and have had it checked out by a local engineering company and they have said there is a bit of ovality in the bores and therefore it is likely it will need machining. As a result of this, we have been looking at the possibility of getting oversized pistons (possibly +0.020"?) to go in once machining has been done, however trying to find a supplier for this sort of thing seems nigh on impossible. It seems the only option is to go for bespoke custom made pistons which understandably are not cheap; but we are on a fairly tight budget for the rebuild. Has anyone got any recommendations for suppliers? Or has experienced a similar thing in the past and give us any ideas?

Any help is appreciated.

Thanks,
Rob
 
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