3A / 4A

Retroloc1 · Post by **Retroloc1** » Thu Dec 16, 2004 8:55 am

What are the differences between a 3A and a 4A block?
Is the 4A bigger or it just has thiner walls ?

Otherwise, is it possible to overbore a 3A block to a 4A size ?

Retroloc1 · Post by **Retroloc1** » Thu Dec 16, 2004 9:01 am

also...

Could a 3A head fit on a 4A block ?

Are they the same ?

It did that with an old Peugeot engine. It raised nicely the CR, added with the major displacement and the small valves that gave an interesting low end torque...