Dennis,
I agree with Brian and John James, you would be pushing your luck to bore
your existing block another 20 thou'. You wouldn't go through into the water
jacket while boring but you'd be left with such a thin cylinder wall that
you'd knock a hole through very soon. If it was mine, I'd sleeve the block
and then bore it back to its original 57 mm. I'm told that Chevy short block
sleeves fit very easily, though I've never used them myself. The 8 thou'
taper in the bores is wear from use, you don't bore them that way.
Cheers, "Bob".
> From: DENKLEMM@aol.com
> Reply-To: DENKLEMM@aol.com
> Date: Thu, 14 Nov 2002 14:31:45 EST
> To: mg-mmm@autox.team.net
> Cc: Kellmg@aol.com
> Subject: Re: MG PA pistons
>
> Let me try to be clearer. The block that came out of my PA is a single
> breather. The pistons that came out of it measure 2.359" (60 mm is 2.362" &
> 57 mm is 2.244") My pistons are already .118 oversize. The machine shop wants
> to bore it out .020 more. The bore of the block has an .008" taper. Could
> this be a PB block and how do I tell the difference? What do I have here?
> Thanks
> Dennis
> PA1518
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