The Stovebolt Site Forums The Shop Area Engine Shop 1959 chevy 235 pressedwrist pin or semi flaoting

so i got a set of pistons online
sealed power 1009P40 not realizing press fit.
mine has the wrist pin pinch bolt.
and having a hard time seeing piston listed as such ??
were there some years the 235s had pressed fit rods ??
can these press fit pistons be made to semi float
for use with my rods ??
thanks

Sorry, all 216,235 and 261 rods are the pinch bolt variety and only work with the correct notched wrist pin and pin size for the specific rod being used.

That number comes up as the right piston on Northern Auto Parts web site
I think you are looking at this wrong.
Do the pins not float in these pistons you have?

I think the ones i got arent as discribed on ebay as
they are AE 16228 english made they come with pins but i cant push them out with my hand.so did all the 235s comewith the pinch bolt rods. none to use a press fit
wrist pin.the ones in my engine have the pinch bolt.
i was going to replace pistons rings not the rods.
thanks

Look at the second post above, they are all pinch bolt rods. The pins in the pistons you have are tight because they need to be pin fitted with a hone by a machine shop before they can be used. They are considered non-floating pins because of how they function in the connecting rods.

You just aren't understanding the correct terminology for the rods. Floating means the wrist pins float freely inside the S/E of the rods and the piston has some form of lock rings to keep the pins in place in the pistons.
Press fit means they do not turn freely inside the S/E of the rods are held solid in the rods S/E by either an interference fit or other methods such as a pinchbolt.

ok thanks
so any new piston i buy will have to honed for
the pin to rotate on the piston. as it is
held solid by the pinch bolt on the rod.
maybe dumb question but why dont they sell them
ready to go?? they list sealed power as 1955-62
1009P40 (40 over) press fit.
thanks

Try doing a good solvent cleanup on the piston/wrist pin assembly. The usual piston to pin clearance is around 1/2 thousandth (.0005")and it's not uncommon for even a slight bit of rust preventive coating to make the pin so tight it can't be moved by finger pressure. When I used to fit oversize piston pins with a Sunnen hone, I would shoot for a clearance where a clean, lightly-oiled pin would slowly drop through the pin bosses of its own weight. If that doesn't happen after you do a thorough cleanup and lube, you'll need to get a machine shop to fit the pins to the pistons. If the pins are already in the pistons, they're very close to the right fit.
Jerry

Because it removes the liability from them if you have a problem with them.