Dr. Jeckel

iTrader: (12)

Putting a 5.3l with 317 heads in my 2002 camaro and wanted to put some forged pistons in for a little piece of mind. The only ones I could find were these from weisco:
Name:
Wiseco -2.2cc 3.78 - 3.80 Flat-Top Piston Set
Item#:
10-K474X
Features:
-2618 Alloy: Will not shatter like hypereutectic or cast pistons
-Strutted skirt design is the strongest and specially designed to run at as little as .004" clearance, with excellent skirt wear and minimal noise or rock
-Radiused Valve Pocket for detonation resistence and increased flow around valves
-Anti-detonation Grooves with the added benefit of keeping the top ring groove free of carbon
-3mm oil rings for better oil control and reduced friction for more horsepower
-Pressure Groove for enhanced ring seal
-Features Chrome Moly Pins and Spiralox (Tool Steel pins optional)
-Race-ready domes don't require deburring by the engine builder
-Skirt coated for lower friction, reduced noise, and superior life
-Multi-fit valve pockets for interchangeability of cylinder heads


They make a -7cc dished piston but it is for a 4" crank and I don't wanna get a new crank. I just didn't know if the -2.2cc flat tops with the valve reliefs will still be good for a turbo setup that will run around 18psi of boost and make about 700rwhp through a th400. The stockers are dished and have held 600rwhp pretty easily from many members, but I wanted a little extra insurance.

Any input/advice is appreciated?

Thank you,
James

old motorhead

iTrader: (10)

If you're doing machine work to the block, why not bore it out to LS1 specs? Lots of piston choices there. A few extra cubes won't hurt either.

Dr. Jeckel

iTrader: (12)

Don't plan to bore it, just hone the block (at most I'll go .020 over). I want to stick with the 5.3l and see what I can get out of it. With 317 heads the compression should still be around 8.6, so I'm not worried about compression really, just want to know if their will be any unwanted affects from using a flat-top piston with valve reliefs on a turbo application.

Any input from an engine builder would be ideal instead of just speculation.

Thanks,
James

TAQuickness

iTrader: (28)

Might call the piston manufacturer and give them your specs. There is not an off-the shelf turbo piston for the 3.800" bore that I'm aware of.

slow67

iTrader: (2)

Wiseco has them now.

Rick_Vor

iTrader: (36)

I think the flat tops will make your compression a littel too high for 18psi unless you are going to run E85 or race gas. Use this link to compute your compression:
http://www.kb-silvolite.com/calc.php?action=comp

Having a killer 5.3l would be impressive but why bother? If you are willing to go .020 overbore, might as well go .125 (?) and have a 5.7l. It will actually have some resale value down the road, be more responsive off boost and you can easily find some used, standard bore forged slugs for 5.7's.

Either way you go, it sounds like you'll have a killer engine.

Dr. Jeckel

iTrader: (12)

With the 317 heads (72cc), it should be about 8.5:1 extrapolating from their site.
http://www.wiseco.com/Catalogs/Automotive/Chevrolet.pdf ...on page 17 for specs about the pistons.

To be honest I wanna keep it a 5.3l, just to try something different.
High psi (above 8-9) it will have methanol/acohol injection.