Ok I have a 99 LS block and am trying to put some year (not sure) type R pistons (integra) in it. Well it is my friend who is doing this. Well what is the differnece in the bore?

The R's wont fit and are off by like a hair pin. Then trying the LS pistons they well slide in correctly... Is there a diff in the bore?

 

there both 81mm time to invest in some measuring tools

 

ALright then I will let him know.

 

i believe all b series are 81.5mm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slowtealgsx &raquo;</TD></TR><TR><TD CLASS="quote">i believe all b series are 81.5mm </TD></TR></TABLE>

Almost....B20


-Ace

 

ALL b-series engines are 81mm stock bores with the exception of the B20 which is 84mm.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by non-VTEC &raquo;</TD></TR><TR><TD CLASS="quote">ALL b-series engines are 81mm stock bores with the exception of the B20 which is 84mm.</TD></TR></TABLE>

 

yeah he's right all b series are 81mm

 

He might have some .25 overbore P73 pistons.

You could always bore out the cylinders to get rid of any imperfections and then put them in.

 

I think he is going to just put his B16's back in there....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slowtealgsx &raquo;</TD></TR><TR><TD CLASS="quote">i believe all b series are 81.5mm </TD></TR></TABLE>


all b series are 81 except B20 is 84 like stated earlier. measure your piston sleeves

 

Look on the top of the Type R pistons and if there is a number 25 written on them then you have over bore pistons.
All b series are 81mm except the b20 and all pistons come in over bore size up to .25mm over.
If the pistons are used then it might be harder if not impossible to see the 25. Other than that measure the thing