410 Pistons
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From: Western Washington
410 Pistons
I have a 390 block bored .060 over and was thinking someday I may want to drop a 428 crank in it to make a 422, but does anyone make 410 pistons for a .060 over block? I believe 410 pistons are 4.08 in and they would have to be 4.11 in .030 over. Or would a 390 piston measuring 4.11 in .060 over work in place of 410 .030 over pistons?
Thanks
OJ
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OJ
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From: Western Washington
OK, so using .060 over 390 pistons can take the place of 410 pistons and still get the correct compression ratio? And is there a difference in piston height between 390 and 410 pistons?
OJ
OJ
Tuned
Joined: Mar 2009
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From: Napa
No, you're doing apples and oranges- 390 and 410 are both 4.05 bore- apples
390 has 3.78 stroke crank, 410 has 3.98 stroke, piston pin height is different- oranges
The pistons are not interchangeable.
Myself, I wouldn't be considering buying new pistons for a 390 block that's been run at .060, just get another block that's not at the end of it's life if you're going to put good parts in it, and run it at minimal overbore.
390 has 3.78 stroke crank, 410 has 3.98 stroke, piston pin height is different- oranges
The pistons are not interchangeable.
Myself, I wouldn't be considering buying new pistons for a 390 block that's been run at .060, just get another block that's not at the end of it's life if you're going to put good parts in it, and run it at minimal overbore.
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Yes there's a difference in piston height between the 390 and 410, I learned that the hard way and pretty much shattered like 3 piston walls. But I have 410 pistons bored .60 over in my 390 right now and its a 423 stroker, but I got stock replacement pistons, that's all we could find that would work.
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You could probably run the the 390 pistons but the tops will need cut down and the valve reliefs will probably need recut. If you go that route you''ll dang sure wanna mock everything up and check clearances though.
Post Fiend
Joined: Mar 2004
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From: Union, Washington
The 410 pistons have a .010" shorter pin height (the pin holes are .010" closer to the top of the piston due to the .020" longer stroke) than the 390 pistons are. I would be leary of whacking off .010" off the top of any piston.
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Tuned
Joined: Mar 2009
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From: Napa
The difference in pin height is a nominal .100, or 1 tenth (or 10 hundreths) of an inch- not .010 or ten thousandths- a pretty good cut. The compression height of the piston (pin to deck) is a nominal .100 less to account for 1/2 of the difference between 3.78 and 3.98 stroke. That cut amount could come down some in correcting the deck height, but I still wouldn't try it without carefully looking at and measuring the particular pistons- the only ones I've seen that were thick enough to take the cut and still be reliable were the old 427 TRW flattops
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Post Fiend
Joined: Mar 2004
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From: Union, Washington
The difference in pin height is a nominal .100, or 1 tenth (or 10 hundreths) of an inch- not .010 or ten thousandths- a pretty good cut. The compression height of the piston (pin to deck) is a nominal .100 less to account for 1/2 of the difference between 3.78 and 3.98 stroke. That cut amount could come down some in correcting the deck height, but I still wouldn't try it without carefully looking at and measuring the particular pistons- the only ones I've seen that were thick enough to take the cut and still be reliable were the old 427 TRW flattops
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