tnmotown

iTrader: (107)

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.

tnmotown

iTrader: (107)

anybody??

Darkman

iTrader: (2)

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

tnmotown

iTrader: (107)

I'm not too familiar with inverted dome, would that mean its a positive cc then?

Darkman

iTrader: (2)

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 .

tnmotown

iTrader: (107)

I'll try and take a pic of it. It definately has two little bumps above deck. The numbers on the pistons say 6464X3 also.

tnmotown

iTrader: (107)

pics added

Darkman

iTrader: (2)

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.

Nemesis350

iTrader: (11)

Not sure about the first part he said, but the rest sounds about right considering what the pistons look like in the pic.

tnmotown

iTrader: (107)

Ok I get what your saying, so in reality these ARE -3cc pistons then?

Darkman

iTrader: (2)

I thiink they are based the part number, the Wiseco literature, and your pictures. But I'm just a stranger on the internet - by all means give TSP a call to verify it before you put it together.

Sales2@Texas-speed

iTrader: (5)

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).

tnmotown

iTrader: (107)

Gotcha, I called you today just to confirm on everything. Looks like they are what they say they are lol. Thanks for the help you guys and now I can decide on which head to go with. Oh, TSP maybe you can hook me up on a deal for some nice heads

Sales2@Texas-speed

iTrader: (5)

We've got a big cylinder head sale going on right now!!

PowerShift408

iTrader: (44)

What kind of price can you give me on a set of PRC 237s?

Sales2@Texas-speed

iTrader: (5)

Fully assembled with the PRC .675" lift EHT spring kit they are $2149.99 plus shipping! Sale is good through Monday morning, January 3rd, 20111 at 9am Central time!

PowerShift408

iTrader: (44)

PM sent.

Tomcat1962

These pistons are in a engine I bought I'm trying to find out what they are any help would be appreciated thanks

LLLosingit

iTrader: (4)

Plenty of info in this post and a simple search shows they still sell the same piston. http://www.summitracing.com/parts/wis-k464x3