I'm curious what the actual measurements are for the cylinder wall length
between the 289 and 302. I know the stroke is longer on a 302, but that
wouldn't necessarily translate into a longer cylinder wall. The piston skirt
is shorter on 302's, presumable for clearance, so it strikes me as odd that
Ford would've increased the stroke of the crank, shortened the piston, and
then moved the bottom of the cylinder wall closer to the rotating mass. I
never thought about it before, but now you got me wondering.
Steve (in N.Id.)
----- Original Message -----
From: A. C. Tynes<mailto:v8tracker@gmail.com>
To: 'Tiger Man'<mailto:Tigerman67@hotmail.com> ;
tigers@autox.team.net<mailto:tigers@autox.team.net>
Sent: Monday, December 15, 2008 2:20 PM
Subject: Re: [Tigers] Machine shop questions
Steve,
I can't help with all the questions, but I can tell you for sure that the
cylinder walls in a 302 block are a little longer than in a 289. During the
289-302 changeover, a number of 289 engines were built with 302 blocks. But
building a 302 (or a stroker) in a 289 block is probably not a good idea.
I also have read that the 289 can take up to a .040" overbore, but that's
the limit.
HTH,
A. C. Tynes
New Orleans
> -----Original Message-----
> From: tigers-bounces@autox.team.net<mailto:tigers-bounces@autox.team.net>
> [mailto:tigers-bounces@autox.team.net] On Behalf Of Tiger Man
> Sent: Monday, December 15, 2008 3:25 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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