oversize piston ?
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From: western montana
oversize piston ?
I'm used to the pistons saying something like 040 etc on them- I'm tearing down 2 windsors and the pistons have nothing on the face and has the piston #463P on one side and the number 3 on the other- i was thinking...and hoping that meant 030 but???
thanks.
researched threads but apparently no one has asked that question that I could find.
thanks.
researched threads but apparently no one has asked that question that I could find.
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Joined: May 2004
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From: The hills of No. Calif.
Yes, all the ones I've worked on have had the oversize stamped right on them in clear measurements. They don't usually use some kind of code to indicate the oversize, it should be obvious. If there's nothing there, then they should be stock bore but the best way to be certain is to measure. A mic is best, but you should be able to tell by measuring with calipers. Stock bore is 4.00, so if they're oversize then that extra .030 or .040 is pretty easy to see.
Also, check the bearings. If they're std. size and original Ford bearings (Ford oval stamped right on them) then chances are the motor's never been apart before. (Although, occasionally Ford put undersize bearings in at the factory to correct a slight machining variance. Still be marked with a Ford logo though...)
Also, check the bearings. If they're std. size and original Ford bearings (Ford oval stamped right on them) then chances are the motor's never been apart before. (Although, occasionally Ford put undersize bearings in at the factory to correct a slight machining variance. Still be marked with a Ford logo though...)
Last edited by TigerDan; Apr 26, 2006 at 08:24 AM.
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From: Williamson, NY
I just bought a set of 0.030" oversized pistons for my 302 rebuild project and they only had a 0.030 printed on the top of the piston in ink, which will surely be burned away after they have been used for a short time. So measuring is indeed the way to find your answer.
Jim
Jim
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From: Williamson, NY
Pistons made by Muskeegan, but to tell you the truth I never looked to see if the pistons were also stamped with the over-sized information as well. Now that I have installed the pistons I do not plan on removing them to check this out.
Jim
Jim
Last edited by cujo8; Apr 26, 2006 at 08:55 AM.
Hotshot
Joined: May 2004
Posts: 12,170
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From: The hills of No. Calif.
Oh c'mon... be a sport and just pop those heads off to let us know!
If they're stamped, I'd think they'd do it right on the top so you'd have surely seen it there already, but I seem to recall seeing pistons one time (I don't recall what application) with the oversive stamped under the dome.
If they're stamped, I'd think they'd do it right on the top so you'd have surely seen it there already, but I seem to recall seeing pistons one time (I don't recall what application) with the oversive stamped under the dome.
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From: western montana
More info....
the heads have been off as have the pistons. The donor block measures at just under 060 but is freshly honed. The block i pulled measures at 3.990 or 010 under 4. but there is a ridge- maybe 010- not much really. So this looks like a good block as the donor had major failure in the heads with metal being distributed to cause major failure on the crank main and rod.
So I need to build a W....will research build specs now and then ask more questions.
I'm surprised at the 3.990 bore- stock?
rog
So I need to build a W....will research build specs now and then ask more questions.
I'm surprised at the 3.990 bore- stock?
rog
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From: western montana
the 060 block truely is 060- pistons ar 050 or so at skirt.
my other block that I just took out has not been rebuilt- piston at skirt is 3.950 and a bit less at top. Thats cool!
Not sure which to use- will post a topic on it.
my other block that I just took out has not been rebuilt- piston at skirt is 3.950 and a bit less at top. Thats cool!
Not sure which to use- will post a topic on it.
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From: Kiefer, Northeastern Okla
Received some really nice skirt coated .060 over pistons from Sealed Power yesterday. The over is stamped plain as day on the top, along with the part number (H273CP). It says here- skirt size 4.05825, +/- .00025 inches. Minimum clearance .0015. Bore range 4.060-4.061. I understand they measure the skirt at 1.585 (I think) inches up from the bottom of the skirt. These are pretty sweet looking pistons (hyper with teflon coated skirts) and they came as a "matched set" +/- 2 grams for $118.49 with shipping. Really getting anxious to start assembly. 
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