Had the same issue this past summer with three guides. Ended up over
sizeing the bore and put in chevy guides cause they have a nice thick
shoulder, these babies are not going to move.
----- Original Message -----
From: "George Harmuth" <harmug@us.ibm.com>
To: <fot@autox.team.net>
Sent: Friday, February 04, 2011 12:58 PM
Subject: [Fot] Oversize lifter bore
>I have a spare racing engine, 1296, that broke two cams. I thought the
> first one was a bad cam blank but when the second one broke in the same
> spot, cylinder #3 intake, after 5 hours run time, we took a closer look at
> the block. It appears that there's excessive wear in the block (hole is
> out
> of round) and the (new) lifter is cocking enough to put excessive side
> loading on the cam lob (radial fracture marks on the cam remains).
>
> I don't have the exact measurements here, the mechanic does, but we were
> discussing options. He was wondering if a sleeve could be used to get the
> bore back in spec. I was wondering if anyone here has seen this and has
> another solution. Is it possible to bore it out and use a larger lifter
> from another series engine? Custom lifters?
>
> Thanks in advance
>
> mike
>
> 63 Spitfire
> HP and HRG1
>
> G. Michael Harmuth
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