Are my flat top pistons really flat?
Are my flat top pistons really flat? Ok I bought a rotating assembly from TSP for my 408 and ordered the set of Wiseco pistons PN#K464X3. Now it says -3cc for the piston but when I had it done at the machine shop they said it seems more like a dome top piston and pops up more like +5cc. Im just trying to figure out the right size so I can make a selection on which heads to use.
Thanks for any input!
Here are the pics, p.s. don't mind the writing its an inside joke.
Thanks for any input!
Here are the pics, p.s. don't mind the writing its an inside joke.
Last edited by tnmotown; Dec 19, 2010 at 08:07 PM.
For what it is worth, some vendors are listing the K464X3 as a reverse dome piston as opposed to a flat top piston.
Edit: additional The Wiesco listing does not appear to provide any particular description http://www.wiseco.com/Catalogs/Automotive/Chevrolet.pdf
Edit: additional The Wiesco listing does not appear to provide any particular description http://www.wiseco.com/Catalogs/Automotive/Chevrolet.pdf
Last edited by Darkman; Dec 19, 2010 at 04:03 PM.
No, it does not mean positve cc, but its appearance may be different. Specifically, if the machine shop was expecting a piston that looked like a stock flat top piston with "fly cuts", the Wiesco K464X3 may not look like that. (Since online pictures are often generic, I cannot find a reliable photo of your piston.) It may look like a slightly dome pistions with reliefs "mashed" into it. Simply put, the confusion may be one of appearance .
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The Wiseco catalog uses the term "Flat Top" for some of the other pistions, but not for those in this LS stroker series. Other vendors call it a "reverse dome" as I said earlier. Presumably the effect of the valve reliefs and the added material just opposite nets to -3cc specification.
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It's a flat-top as stated on your invoice. Wiseco uses that "hump" on the other side of the valve relief for a couple reasons. One reason is that you get a deeper relief without having a large negative volume (because the hump is positive volume to offset some of that).
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It's a flat-top as stated on your invoice. Wiseco uses that "hump" on the other side of the valve relief for a couple reasons. One reason is that you get a deeper relief without having a large negative volume (because the hump is positive volume to offset some of that).
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