Racingcowboy89
Well-Known Member
Looks like a micrometer this time.
Mopar 350 Stroker
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33IMP
Well-Known Member
I can't quite read the scale, (too much shadow) but I believe you. And if you truly have a 3.97 bore you have about .003 p/w Depending on what the piston is made of that could be good, or bad. (2618,4032, hyper or cast, later two very unlikely if truly Ross. )
And if you have Chevy rods, the likelihood is that you have Chevy pins too, in your custom pistons. See if you can get a measurement of the diameter of the pins. Caliper will be close enough for now. Are the pins full floating?
If memory serves, small chevy pin is .927 .
Edit: while you're at it measure the thickness of the big end of the rods, and give us that. Caliper will be fine.
And if you have Chevy rods, the likelihood is that you have Chevy pins too, in your custom pistons. See if you can get a measurement of the diameter of the pins. Caliper will be close enough for now. Are the pins full floating?
If memory serves, small chevy pin is .927 .
Edit: while you're at it measure the thickness of the big end of the rods, and give us that. Caliper will be fine.
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No, turn it around 180 degrees so we can see it.
Racingcowboy89
Well-Known Member
Pin's are full floating, the Micrometer is saying 3.93 for measuring of the pistons so the cylinders I am gonna have to remeasure them again with the digital caliper.
I don't know why, but this thread needs titties.
Put the piston in the bore upside down below the shadow of the top ring in the bore and slip a .003 dealer gauge in there. Now try a .004 ect…
33IMP
Well-Known Member
Turk, what does a filled block do to the piston/wall clearance requirement? I've never run a filled block
Looks like 3.917 to me IF that's in the 3" scale. Crappy picture, though.
Racingcowboy89
Well-Known Member
Can you read them now???
If the fill comes up very much above the piston skirt then it requires piston to wall and possibly ring gap clearances similar to air cooled engine specifications.
Racingcowboy89
Well-Known Member
I am hoping this is more readable
You clearly don't know how to read a mic. But that's ok. None of us knew how either until we learned. But yes, what "I" see is "ABOUT" 3.917 so in other words, standard bore 318. They're probably just a little warm.
Racingcowboy89
Well-Known Member
3.9686 by my eye
Ok, now that's a different reading than before, or those pics before were just totally crappy. That's 3.97 "something" but that mic is out of calibration.
Well...it's hard to tell because the mic is out. The wheel is right ON TOP of the .075 hash. But it SHOULD be aligned with the zero.
33IMP
Well-Known Member
I'm sorry. I read the first pic in #112 at (3).9685
You need someone over there with a GOOD mic who can READ a mic.
Who knows what he has at this point?
I think those are NOT a 3 inch mic. may I suggest I measure them.
Yes. Those need hand measurements. Maybe even mouth measurements.
Racingcowboy89
Well-Known Member
If it is 3.97 then okay Ross was right about the pistons
That's what it's appearing. HOWEVER, remember this. Piston manufacturers give a specific place on the skirt to measure from. For instance, .*** down from the pin hole for example. But for all practical purposes, I think the 3.97 figure is correct. At least that's what I see. But I only have one eye. lol
not with it filled with concrete, no.
yes, but no, but also yes and no.
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