special 313 engines
When I came to rebuild my 407 , 313 engine because, I think, very poor quality Irish petrol on a tour in Southern Ireland had caused one piston to loose its rings and scour the block.
When investigating the supply of 30th oversized liners in turned out to be far cheaper to use 40th pistons which were std on the 318. Every other dimension was the same.
I therefore think my engine is a 318 in effect. Not that relevant but I though interesting given the subject.
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