Mark, the blue book is interesting and does ask a question regarding the maximum permitted engine sizes. I am relying on:
48.2.6. With the exception of cars accepted under 46.3,a car may be fitted with a different engine, notexceeding 25% increase of the capacity of the model,when it was supplied as original equipment by itsmanufacturer.
I am the member of another forum (BMW Rallying) where this subject has also been raised and clarification sought from the MSA who say that provided the engine is no more than 25% larger than the maximum size fitted by the manufacturer then
it will be acceptable. The premise here is Lister Bell (as a manufacturer) offer a range of engines including the Toyota engine which would suggest we could go to 3.5L + 25%. I will seek clarification myself from the MSA and post the response here once received.
It would be a bad day to present the car for its log book and not get it!
Andrew


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