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Originally Posted by articfriends
(Post 4848060)
1. The J/E piston is for a 4.525 bore OR is it for a 4.530 bore and measures 4.525?
2. are either set of pistons 2618 or are they 4032? 3. when you buy say a set of J/E "4.530 pistons", unless you call JE up and custom order a set of ACTUAL 4.530 OD pistons (which would require a 4.535 bore =/_), you are actually getting a piston that fits that 4.530 bore size once accounting for "normal" clearance. Now, lets say the piston is a SRP 4032, it would measure about 4.526, a 4.530 bore would give you .004 piston too wall. Lets say it was a 2618, it would be more like 4.525 OD and give you .005 piston to wall in a actual 4.530 bore. Now, lets say you wanted a target clearance of .007 for some reason, you might hone block to 4.532 , or if piston started life a 4.525 and is worn to 4.524 youll end up at .006 or higher. You may very well NOT have a problem, Smitty |
Originally Posted by JaniH
(Post 4848063)
Picture of the junk piston?
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I was running a 427 in a drag car years ago and I think it was somewhere around .013" skirt to wall clearance... not because that was ideal, but because I didn't want to put new slugs in a worn-out block.
It was a little noisy on cold startup but ran like a scalded cat with a 325hp shot of nitrous. Of course a short stroke with long skirts is alot different than a longer stroke with short skirts... If it were me I would order a fresh set of custom pistons to match the existing bore. JE will make them however you want. I ran a 513 one time that was a .137" over GM block and a 4.250 crank. JE made me 10 pistons for it. |
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Originally Posted by JaniH
(Post 4848084)
looks nasty but might work with new rings. Without knowing how it looks, you could be happy boater with that piston in your engine.
https://cimg4.ibsrv.net/gimg/www.off...16b5dc3ce.jpeg https://cimg8.ibsrv.net/gimg/www.off...94c9b2229.jpeg https://cimg0.ibsrv.net/gimg/www.off...cbd7c0b4e.jpeg |
What’s the history on that engine? Was it lugged?how many affected, just the one? Carb or injected?
I wouldn’t run those. |
Originally Posted by TomZ
(Post 4848093)
What’s the history on that engine? Was it lugged?how many affected, just the one? Carb or injected?
I wouldn’t run those. |
Originally Posted by articfriends
(Post 4848060)
1. The J/E piston is for a 4.525 bore OR is it for a 4.530 bore and measures 4.525?
2. are either set of pistons 2618 or are they 4032? 3. when you buy say a set of J/E "4.530 pistons", unless you call JE up and custom order a set of ACTUAL 4.530 OD pistons (which would require a 4.535 bore =/_), you are actually getting a piston that fits that 4.530 bore size once accounting for "normal" clearance. Now, lets say the piston is a SRP 4032, it would measure about 4.526, a 4.530 bore would give you .004 piston too wall. Lets say it was a 2618, it would be more like 4.525 OD and give you .005 piston to wall in a actual 4.530 bore. Now, lets say you wanted a target clearance of .007 for some reason, you might hone block to 4.532 , or if piston started life a 4.525 and is worn to 4.524 youll end up at .006 or higher. You may very well NOT have a problem, Smitty https://cimg2.ibsrv.net/gimg/www.off...c515177d5.jpeg https://cimg4.ibsrv.net/gimg/www.off...6931f1bd2.jpeg |
Ring lands don't look good.
Throw it in the garbage. |
Originally Posted by articfriends
(Post 4848060)
1. The J/E piston is for a 4.525 bore OR is it for a 4.530 bore and measures 4.525?
2. are either set of pistons 2618 or are they 4032? 3. when you buy say a set of J/E "4.530 pistons", unless you call JE up and custom order a set of ACTUAL 4.530 OD pistons (which would require a 4.535 bore =/_), you are actually getting a piston that fits that 4.530 bore size once accounting for "normal" clearance. Now, lets say the piston is a SRP 4032, it would measure about 4.526, a 4.530 bore would give you .004 piston too wall. Lets say it was a 2618, it would be more like 4.525 OD and give you .005 piston to wall in a actual 4.530 bore. Now, lets say you wanted a target clearance of .007 for some reason, you might hone block to 4.532 , or if piston started life a 4.525 and is worn to 4.524 youll end up at .006 or higher. You may very well NOT have a problem, Smitty seal CR9190? |
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