Holeee crap. The price on that one [see link] is somewhere about $650,....... US.
Thats a bleeding lot of semolians for an oil pump.

Well from what I can tell they're NLA but if found here, they're a small fortune:

http://page7.auctions.yahoo.co.jp/jp/auction/g30454284

hi as far as i know there is a hi volume oil pump available from ( NISMO PARTS .COM ) part number 15010-25720.

sly old fox...

I got mine back in 74 from the local Nissan dealer.
The part number is 15000-25722
Good luck

So the nismo pumps exist, where do they come from?
I've been thinking about hacking the high volume pump, what was done to keep the spacer aligned so that it doesn't bind up ? I think the spacer could be made and welded to the pump body and the whole thing made true again, that would be better than having a floating spacer there.

( this is starting to sound expensive where can i get a nismo pump?)

Below is Stirlingmac's Nizmo oil pump

Had a concerted hunt in the garage and found it
I have uploaded a picture of it but I'm not sure how to display it in this message.........
Maybe this will work.........[img]http://datsun1200.com/modules/myalbum/viewcat.php?uid=-1[/img]

There was a high output oil pump for A series motors. I have/had one somewhere, but last time I looked for it I couldn't find it and fear it may have disappeared when the garage was burgled.
Anyhow, instead of a rotor with lobes on it there were two gears that pumped the oil. It also had oil cooler connections on the exterior of the pump.

So it seems that nobody thinks an A15 needs a high volume oil pump. You guys might be right. I like to over do things.

On my E16 engine with this same oil cooler I had 50+ lbs of oil pressure all the time using the stock oil pump. I also add something to the system, I put a hydraulic system check valve right at the oil pump outlet, before it goes to the oil filer and thermal reulator, so the system can't drain back into the oil pan. It makes a neat noise at idle too. Am i crazy?