Harry:
The short answer is no, you cannot get 0.060" over pistons.
0.040" over is as big as they get.
When you buy a piston set, you should get the clearance
information with the piston set. The final clearance is obtained by
honing, so you bore undersize and then hone to the final clearance.
Bentley also has the final numbers you need to aim for if you need the
information before you buy the pistons.
If your block needs a 0.060" overbore, you will need to resleeve
it or scrap it and get another block to use stock hepolite type pistons.
If you are determined to proceed with the 0.060" overbore, then
you can use pistons from another vehicle (Mazda 626 pistons have been
used, as I recall) but they will need some machining to fit (ka-ching!)
or go with some custom pistons (ka-ching! ka-ching!) from the likes of
JE or Keith Black.
Bottom line, doing a 0.060" overbore will add a lot of cost,
whether you resleeve, use non-tr6 pistons, or go the custom route. For a
street rebuild, a new block is much less expensive, unless you are
trying to maintain a numbers matching car...
Just my $0.0000002
Vance
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of Harry Hart
Sent: March 11, 2005 10:45 AM
To: 6Pack
Subject: re:piston clearance
My engine is at a machine shop here in Birmingham and I need to find
out the
recommended clearance for pistons? Also is it possible to find pistons
that
are 60 over?
thank You
Harry Hart
1972 TR
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