Question about overbore engine block - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

unicoder · 06-08-2018, 11:19 PM

So I sent my 250k mile block to the machine shop. They are claiming I need a 0.030" overbore, but all the pistons im finding are 89/89.5/90mm

is my only option 90 since 0.030" ~ .75mm and I don't see 89.75mm pistons anywhere?

I am finding it impossible to find .040 over stock replacement pistons, the only 90mm im finding are the forged ones.

kyral · 06-09-2018, 08:13 AM

I only saw 40 overs in cheap Chinese brands
the 30's I found by npr but all the kits were out of stock

tuzzio · 06-09-2018, 08:15 AM

Yep, scoop some .040 wisecos and call it a day.

06-08-2018, 11:19 PM	#1
unicoder Zilvia Member Join Date: Apr 2017 Location: Alabama Posts: 160 Trader Rating: (2) Feedback Score: 2 reviews	Question about overbore engine block So I sent my 250k mile block to the machine shop. They are claiming I need a 0.030" overbore, but all the pistons im finding are 89/89.5/90mm is my only option 90 since 0.030" ~ .75mm and I don't see 89.75mm pistons anywhere? I am finding it impossible to find .040 over stock replacement pistons, the only 90mm im finding are the forged ones. __________________ 5.3 V8 Swap w/ Nitrous

06-09-2018, 08:13 AM	#2
kyral Zilvia Junkie Join Date: Nov 2012 Location: wisconsin Age: 29 Posts: 447 Trader Rating: (7) Rides Gallery: kyral Feedback Score: 7 reviews	I only saw 40 overs in cheap Chinese brands the 30's I found by npr but all the kits were out of stock __________________ The Game you lose haha

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06-09-2018, 08:15 AM	#3
tuzzio Nissanaholic! Join Date: Oct 2013 Location: Western Mass. Posts: 2,254 Trader Rating: (3) Feedback Score: 3 reviews	Yep, scoop some .040 wisecos and call it a day.