HondaKiller

ya i have a 1987 300zx and i just wandered how much can i bore the engine of a vg30e (i believe) and how much it would cost; what is the bore already and what is the max. And if i should rebuild it before or after. I want to have a car with high performance standards so i dont have to mess with it later. i also need to know what would be a good brand of internals and where i can get them thx.

PS: must be able to with stand stage two turbo and im not rich i have justed saved up for five years and ready to spend alot of serious cash.

JakeMonkey

from what i've heard, the w-series motors can't be bored out, as the cylinder walls are too thin and already bored out to the max. You could ask a reputable Nissan tech about this for sure, as i'm not 100 % about the possibilities of it working out.

Marc Z31

you can go .5mm overbore, and that's pushing it.
SOKO.com has engines for $550.

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KungFuGrandpa

I rebuilt my motor and i put 20 over pistons in it. Thats as far as it will go. Whatever you do dont get them port and polished becouse it doesnt do anything for it. It only adds 14cfm to them its not worth the money unless you realy want every horse you can get. If you want get the valves backcut and seats regrinded, this will decrease valvetrain weight and let the engine rev better. It will also increase cfm into each cylinder about 4 cfm. You can also get the crank shaved down .030, this makes less friction on the crank and it will rev quicker too. Take the connecting rods and go to a machine shop and get the extra weights shaved off the top and bottom of it, and balance them and the pistons. Also you can get the heads milled down to up the compression, but you have to be carefull that the heads arnt warped becouse it will mees them up if there milled. I also know some more about it if you want to email me about it...i know what im talking about too im a machineist who loves 300zx's and i know a lot about the VG30E engine
ohhh yeah it cost me about 1,700 for total rebuild
Email me at EvaR2004@Aol.com