Gregg:
I don't have the specifics, but the 1950cc oversize pistons are
substantially larger than +60 over.
The B series engine is usually ok at +60, which is why the piston is
supplied.
I did have an engine block that failed, but the pistons in it were +120 and
that block ran for a number of years before water jacket corrosion
perforated the cylinder bore.
Kelvin.
>
> All,
> I'm rebuilding my 69 MGB and am going to need to bore my
> cylinders. The
> cylinders have already been bored .030 and I'm wondering
> about going to .040
> or even .060. I see Moss has pistons that are.060 over and I
> was wondering if
> this starts to exceed the safe size without possibly getting
> into the water
> jackets? What is the overbore on the 1950cc engines? I've
> read in several
> places that even though the warning is always given about the
> 1950 overbore
> that the blocks very seldom have problems. If the overbore
> on the 1950 blocks
> is much less than .060 I would feel much better about trying
> it. I realize
> that boring this large will ruin the chances of another
> rebuild without using
> liners and I willing to deal with that.
> Anxious to hear any responses.
> Thanks,
> Gregg Baker
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