440 source 470 stroker .005 piston to wall ?

[73dart360]

440 source says make the piston to wall clearance on my 470 stroker kit .005, Forged Icon pistons, it is not a race motor ,does that seem like alot of play even with expansion will i get piston slap? can somebody that has built this chime in .

 

[brian6pac]

that's right they will scuff if you don't, My Ross pistons were .006

 

[73dart360]

that's right they will scuff if you don't, My Ross pistons were .006

Thanks Brian

 

[famous bob]

Thanks Brian

my 505 hughs stuff said .004 on the racebalanced kit. scared me too, after running a hemi for a lot of yrs w. the heavy trw pistons. I`m running.0045 .

 

[73dart360]

my 505 hughs stuff said .004 on the racebalanced kit. scared me too, after running a hemi for a lot of yrs w. the heavy trw pistons. I`m running.045 .

i think i would feel better at .045 also

 

[famous bob]

i think i would feel better at .0045 also

we used to set a new hemi up w/ .008 back then, because the pistons grew in the heat so much.

 

[brian6pac]

Ross said if you run nos you need .012-.015 same with turbo or supercharged

 

[73dart360]

we used to set a new hemi up w/ .008 back then, because the pistons grew in the heat so much.

Naturally asperated only on this one

 

[moper]

Icon instructions are pretty clear. NA bores larger than 4.10 go .004-.005. I think you're fine even at .006. The new alloys don;t expand as much, even under racing conditions so most applications running a modern alloy are tighter than us older guys might remember.

 

[73dart360]

Icon instructions are pretty clear. NA bores larger than 4.10 go .004-.005. I think you're fine even at .006. The new alloys don;t expand as much, even under racing conditions so most applications running a modern alloy are tighter than us older guys might remember.

Moper where would you set them at what #

 

[famous bob]

Moper where would you set them at what #

do what the piston manufacturer tells you !

 

[moper]

The instructions are on the KB-Silvolite site if you go into the piston part number detail. There's a link for special clearance info, then another link for installation guides. Might be a faster way but that's how I found it. Where I would set it depends on what it's going to be doing and who's doing it. For no power adders and a heavy foot I'd go .005. Loose tends to be faster at the track but will wear the rings out faster.

 

[73dart360]

The instructions are on the KB-Silvolite site if you go into the piston part number detail. There's a link for special clearance info, then another link for installation guides. Might be a faster way but that's how I found it. Where I would set it depends on what it's going to be doing and who's doing it. For no power adders and a heavy foot I'd go .005. Loose tends to be faster at the track but will wear the rings out faster.

Moper i appreciate it ill have a heavy foot once in a while but not too often -track once a year- no roll bar so ill probably get kicked out after 1 or 2 runs

 

[DrCharles]

Is that actually .005 piston-to-wall clearance, or is it a bore .005 bigger than the piston diameter (which would be .0025 piston to wall)?

 

[73dart360]

Is that actually .005 piston-to-wall clearance, or is it a bore .005 bigger than the piston diameter (which would be .0025 piston to wall)?

.005 piston to wall is what 440 source said