i,m not a mechanic so just my thoughts,could an engine be built from the original bore of 3.5 then the longer stroke crank and rods of a later 4.6 engine fitted to give an engine of about 4.4 ltrs ,but without the slip liner problems.
Not always the case, both myself & a mate each converted a 3.9 to LPG back in the 'nineties with engines that had covered around 90k at the time. Within one year/12k both had developed the dreaded slipped liner syndrome - neither conversion was a DIY job either. It is possible to re-build a 3.5 to 4.3 (Real Steel used to supply the kit) which results in a very torquey engine without the need for excessive revs. whilst retaining the 3.5's reliability. I knew a LR mechanic who carried out this conversion on his own 3.5 but you have to respect the transmission thereafter
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