The iron block is 4 bolt. I think the iron block is strong enough for any power one would be likely to obtain. My first idea was to stroke the engine only and not bore it. I even machined one 4.5 piston for the longer stroke to test my theory. I had to take about 5mm off the top and some off the skirt but there was still a small dish left and the rings were still about 5mm down. That would have resulted in a 5L engine with about 10:1 CR if your cylinders and pistons were good enough to be honed for new rings. If you need new pistons you might as well bore it.
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Tony H
W111 280SE 3.5 Coupe
Manual transmission
Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT
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