Piston to block clearance

[billtroth]

I found an interesting article on correct piston to wall clearance.

http://blog.wiseco.com/piston-to-wall-clearance-myths-mysteries-and-misconceptions-explained

It's a good comprehensive article that explains the subject pretty well but it is a generic perspective and left me curious about the specific parameters on FE engines. 

Does anyone have experience or input on things like differences between cast iron blocks ( stock, aftermarket, filled or not filled) and aluminum  blocks, stroke, need to coat piston skirts and other tech. subjects in the article.

Thanks in advance for any input.

[scott foxwell]

That was extremely generic.
Do you have a specific question?

[billtroth]

What would be a good "textbook" clearance for my 427 stroker.  Stock Ford block ( marine block cast as a side oiler and machined as a center oiler), block filled to the water pump, bored .040 over, running Scat 4.25 stroke reciprocating assembly.

[scott foxwell]

What would be a good "textbook" clearance for my 427 stroker.  Stock Ford block ( marine block cast as a side oiler and machined as a center oiler), block filled to the water pump, bored .040 over, running Scat 4.25 stroke reciprocating assembly.

The only "textbook" would be the data that came with the pistons. If you don't have any data then a manufacturer or art number would be helpful. If none of that, then a picture of the piston. Are they cast? Forged? Hyper? Completely depends on the pistons.

[Falcon67]

As above - depends on the piston.  I have run old TRW forged as tight as .0032.  Some have run those .007~.010 without much issue.  The light weights in the 393C run at .0045 per the piston specs. 

[gt350hr]

  It is CRITICAL  to confirm with the piston manufacturer on piston to wall clearance.  EVERY manufacturer has their own specific clearance check point and clearance they want , there is NO standard. You also have to take into account the different materials used in making them. 2618,4032, and MS75 are all different. CNC lathes are capable of very complex shapes that are not seen by looking at them. This was not the case in the past when skirts were actually ground.