Steve
You really need a bore gage to read the diameter. You also want to
make sure the bores are not trumpet shaped.
You can do this with a snap gage but you also need a 4" micrometer to get a
really good reading. If you want a rough guess at the top just under the
ridge; measure the width of one of the rings, put it square in the bore,
then measure with your calipers add in 2x ring width. You can always
measure what the top is and then guess what the ridge thickness is for a
rough estimate.
Got a machine shop in your area; you need to talk to them.
40 over is pushing it, you really need to sonic test all the bores to know
if it can be bored that much.
Not sure what the cost is for sleeving an engine.
They make stroker kits for just about every engine.
Hardened seats should be obvious if they are in the heads, I believe. I
have been told that you don't need hardened seats unless you plan for the
engine to live a 5,000 rpm or more mostly but I'm no expert here.
Ron Fraser
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of Tiger Man
Sent: Monday, December 15, 2008 4:25 PM
To: tigers
Subject: [Tigers] Machine shop questions
Hey there,
I thought I would ask the group some questions and see if you guys can bring
up my machine shop IQ.
I found a deal on a used 289 5 bolt bell housing reasonably local to my area
for not much money. Would have loved to know these answers before I shelled
out money, but since I didn't spend too much, I hope that means I can't
loose that much either.
So here are some basic machine shop type questions I have.
How can you accurately measure or determine the current bore/piston size on
a used block, without being able to take it to the machine shop first. I
don't see any markings on the piston that would help me out. I'm assuming
my standard cheap digital caliper can't measure it because 1) it doesn't
have the reach to measure an inside diameter beyond the 'ridge' area. and
b) because it has some width to it, and not a blade point It will be off by
a bit when trying to measure the inside of a cylinder.
If the block or pistons come out at 30 over already, can the block be
cleaned up to 40 over, or are you just asking for trouble (overheating)?
Is a 5 bolt 289 block worth having sleeved if the bore is out of spec, or is
that an outrageously expensive option?
Would a mild stroker kit fit in a 289 block, or when they went to the 302,
did they physically change the length of the bore?
Is there any way you can tell or test to see if a set of used ford heads
already has hardened valve seats in them? I am assuming that if it had
hardened valve seats already installed, that would significantly reduce the
cost to recondition a set of heads?
Anyway, thanks for any help you guys can give me, hopefully I didn't buy a
large paperweight.
Steve
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