If you are talking SCCA racing -- +.050 or +.060 would be illegal.
GCR (PCS) 17.1.1.D.1.g.1: "The block may be rebored no more than 1.2mm
(.0472 in) larger than the maximum dimension given on the specification,
line for that make, model and displacement."
But ...g.2. lets you sleeve the block, so if you must do "illegal" overbore
to fix the problem, you sleeve it and get back to an allowable dimension.
Which also means that if you have not hurt your old pistons, you might be
able to re-use them in a properly sized bore.
--Rocky Entriken
(1147 motor)
----- Original Message -----
From: "Russell" <rjmunns@btopenworld.com>
To: <Gt6steve@aol.com>
Cc: <FOT@autox.team.net>
Sent: Thursday, October 24, 2002 1:25 PM
Subject: Spitfire Racing Pistons
> Please help!
>
> I need a set of race pistons for a spitfire 1300 engine. I had ring
sealing
> problems that have now been traced to oversize bores. I now need a rebore
> and a new set of pistons. I cannot afford forged pistons unless someone
does
> me a large favour!
>
> Can anyone tell me some suitable pistons that would be suitable for racing
> between +50 and +60 sizes?
>
> Russ.
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