well went around town today asking if anyone could bore my little d16 out to 75.5 but all the shop say they wont touch aluminum blocks because they dont have the troque plate for it. the troque plate is put on top, giving the block the pressure of the head being on it so when they bore it out and put the head back on the sleeves will be perfectly round. the guy also said if this is not done then the block might burn oil because the sleeves might not be perfectly round because there was no stress on it. so is there really a troque plate for when boring out aluminum blocks or is this guy full of crap?

 

Torque plates are primarily used on iron block engines, especially with siamesed cylinders. I can't fathom how it could have much of an effect on an iron sleeve/aluminum block combo, especially with floating sleves like you Honda guys.

The idea behind it started with we v8 guys. On a small block chevy there are 5 bolt holes surrounding each cylinder and when the heads are torqued on (especially with studs) the block can slightly distort around these areas causing the block to not be perfectly round.

But on an engine like yours the head bolts/stud holes are not connected to the actual cylinder in any way so I can't really see how a torque plate could have any effect at all.

 

i knew it, that damn machinist didnt know what he was talking about; not that he didnt know what he was talking about but he just didnt know import engines.