Piston Grading Think Im Stuffed Now

[ZimNismoBoy]

So i have ordered new pistons and received them.

Confirming they are nur pistons all is clear .... maybe not.

Im getting a new block and will need to ensure i have the correct grade pistons for the block .

So the block hasnt come yet and i have grade 1 pistons across the board. All 6 of them .

So now if i receive a block that says grade 2 across the top stamped on all cylinders that means i wil have pistons that are too small for the bore .... am i right .

the pistons come with a grading number on the top for a new block and have to be matched correctly with the bore .

Please let me know your thoughts if it means i order a new set of pistons when the block comes then so be it but what a bodge .

Any ways look forward to hearing from you guys .

Cheers

Adam

[Duncan]

here is the information from the 32 GTR service manual on piston grades. I guess it is highly likely to be the same.

How are you going to have this motor measured and assembled? I would let the engine builder worry about this, keep in mind the grades 1-3 are only 0.01mm different, or 4thou. They are not the usual oversize options of 0.05/0.1mm

[ZimNismoBoy]

thanks there buddy, im crossing my fingers that the pistons will fit the block im going to get, ive specifically asked to try and get a matched block with grade 1 cylinders so that the bores are graded to a 1 and match pistons .

Wish me all the best else it means ordering another set of pistons and hopefully selling this lot that i have ??

if the block isnt the same bore size.

Thanks

Cheers for now