Etec Racing

I own a 3.2 liter NSX short block and have been looking for specs for allowable deck resurfacing. My factory manuals list just about every number except for this measurement. Any advise on where I can find this spec would be great. Thanks!

birdd

Has the block been milled already to your knowledge? Are you looking to just clean up the surface for a rebuild?

Etec Racing

Thanks! Someone "cleaned up" the deck with most likely a roloc disc with a fine grit. Since I plan to sell this short block at some point I want be to sure its correct for the new owner.

birdd

I think you will be fine taking it down to .005 if need be to clean it back up, just start with .002 and go from there. You should also check how far the pistons come out of the hole on all four corners and cut accordingly to take out any warping of the deck.

PyroProblem

IDK much about NSX engines but on B series, there are little circles that are supposedly there to reference how much the deck has been machined.
There little circles that sit just below the deck. When you deck the block enough times eventually you hit them and then that's it.
Do you see anything like that on your block? Mine looks like this.

Runnerdown

The cast in dimples don't reference any sort of limitation. It's a very unsubstantiated opinion I have seen time and time again pop up here.

I wouldn't worry about skim cutting the nsx block to renew the surface finish. If the spec is not in the manual then it likely won't be anywhere.

PyroProblem

I don't believe I've ever seen any factual data to prove it either. But it kinda makes sense though doesn't it?
I think it's like a go/no go gauge for the deck height limits. Cut as many times as you like until you hit the dimple.
I know someone out there knows what their purpose is...