I picked up a used set of pistons of a guy about 5-6 months ago and am now assembling the motor....i need to know the piston to cylinder wall clearances....

the only # I see is on the bottom of the piston w/ a star above it

#331130
also inside the piston it says
#8127
FT

any idea what part # these are, i looked on arias website but to no avail...

 

You should be fine with .0030 clearence on most forged piston applications that are shelf stock.

Some run a as tight a.0025 and others loose like .0035.

Is this a N/A set up or an FI set up.

edited becaue I forgot a zero.


Modified by asubennett at 1:36 PM 1/9/2005

 

FI

thanks for the info

 

You should call Arias and see what they reccomend but depending on the amount of boost you are running I would stay on the looser side of .030 to account for heat induced expansion. IM Tom J on this board. He will help you out.

 

That piston is 3.205 bore size it needs .003 in clearance. If you make your final bore size 3.205 you will have the clearance you need.003


Tom J