I have been looking at this a lot lately. Looks like off-the-shelf for Ford
2.3L you can get compression distances of 1.585, 1.590, and 1.610 (the 260
is 1.60). Bore sizes in 3.81, 3.82, 3.83 and some others. The pistons are
not all that cheap though, but better than custom.
Seems like finding off-the-shelf pistons specifically for a 260 is about
impossible these days.
Here is the goofiest scheme I have so far:
5.7" rods
1.090" compression height pistons from a 2.3L Ford
Compressed gasket of .030
2cc valve relief on the piston top
55cc combustion chamber
.016 deck height clearance (assuming the deck hasn't been milled)
= 10:1 compression (pump gas)
The pistons would stick out of the block by .019" at TDC :-o
The piston and valve clearance would probably be too small, but it's fun to
think about.
Bob
> My rebuild this year, took the engine .030 over.
>
> I think the gating item is availability of oversize pistons. You might do
> a
> search on 260 pistons to see what you come up with. On the other hand,
> maybe
> you can go higher and use pistons that will work from some other
> application
> (for instance, when rebuilding an Aston DB 2 engine, people use Dodge
> Dart
> slant six valves, supposedly better and much cheaper. And mine runs
> fine!)
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