2618-T61 Vs 4032 High Silicone Pistion Differences

[JAKE]

I've been internet shopping for a set of pistons for the 396 LT1 engine build for my son's car. I've come across pistons made of two different alloy specs - 2618-T61 Forged Aluminum and Forged 4032 High Silicone Aluminum alloy.

I came up blank when I tried finding a site that compared one material with another. Does anyone know the advantages/disadvantages of one Vs the other?

Thanks for the help.

Jake

 

[JAKE]

I guess no one knows. Okay, I'll just rely on my own research.

Jake

 

[jack]

2618 expands MUCH more than 4032 ... thus 2618 REQUIRES 2-3 times more piston-wall clearance. 2618 has Less silicon and is Less brittle and More ductile than 4032. In today's context, 2618 use is primarily race.

If yours is primarily a street motor and it will Not see routine use of nitrous or turbocharger or supercharger ... suggest 4032.

 

[JAKE]

2618 expands MUCH more than 4032 ... thus 2618 REQUIRES 2-3 times more piston-wall clearance. 2618 has Less silicon and is Less brittle and More ductile than 4032. In today's context, 2618 use is primarily race.

If yours is primarily a street motor and it will Not see routine use of nitrous or turbocharger or supercharger ... suggest 4032.

Thanks, Jack. That confirms what I've read. .003"/.006" is the piston to wall range I've seen for the Probe 2618s.

Jake