ok, i just got word from the machine shop that my ls block is out of round, different specs on each cylinder. so i'm glad i had it checked before spending my $$$ on the pistons. they say it needs to be bored over to .020, so i'm going to buy the pistons now knowing it has to be bored over so they can measure them before boring the cylinders.

here's my question, if it's going to be bored over .020, what mm bore is it going to be? stock bore on a b series block is 81 mm, so would this make it now a 81.5 mm bore? also, oem honda pistons are offered in a .025 mm oversize, what size mm bore is this?

thanks for the help.

 

.025 mm is about .010" if the machinist has to go .020 then your getting a .5 mm overbore.a mm is .039"

 

with .25 oem honda (.25mm) bore is 81.25 mm/3.198 in.

with .020 aftermarket (.020 in.) bore is 81.50 mm/3.208 in.

with .040 aftermarket (.040 in.) bore is 82.00 mm/3.228 in.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TECH43 RACING INC. &raquo;</TD></TR><TR><TD CLASS="quote">with .25 oem honda (.25mm) bore is 81.25 mm/3.198 in.

with .020 aftermarket (.020 in.) bore is 81.50 mm/3.208 in.

with .040 aftermarket (.040 in.) bore is 82.00 mm/3.228 in.</TD></TR></TABLE>


yes! that's exactly how i wanted it broken down. thanks for the help!

 

steve is the greatest!!

 

yea, now i'm one step closer to finishing my project.