another early LZ head at auction. Did not sell at 450,000 yen (4,600 aud or 3,000 usd)
https://page.auctions.yahoo.co.jp/jp/auction/h1102527288

Might be the same head as sold a year ago last January for 485,000

Quote:

Auction ended 26 August 2023
Quote:

I don't know if those are new yet-to-be-used valve seats installed, but i'm surprised it looks to be just a one-angle type and not blended into the ports very well. Even a stock A12 has three-angle valve seats

The beauty of these head are not that they are just twin-cam, but more that they are 16-valve heads. A junkyard KA24DE would be more powerful perhaps, but this is period cool

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  combustion chamber.jpg (111.41 KB)


  face.jpg (102.68 KB)


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  early LZ cam ends.jpg (169.42 KB)


  exhaust.jpg (136.77 KB)


  top.jpg (99.26 KB)

Very interesting thread, I learnt a few things today.

good info thanks

seems to be some confusion here. What was auctioned was an early LZ14 head from around 1973, PB110 era, there's less than ten operational world wide. It was a bare head, and the price was kinda reasonable, but to recommission it would cost lots, no valves valve springs cams and more importantly cam buckets. The green LZ20B is a type 2 rally head probably PA10 or S10, there's a few of these around at least four running engines in Australia, 1 x LZ20B, 1 x LZ18 and LZ14 rally engines and one turboed LZ20B track engine.

There is currently an LZ20B head and turbo on yahoo auctions, it's a bare head and would cost around $30k on top of the purchase price to make it work.

The cams from the type 1 and type 2 heads are not interchangeable

Just in case there are no purists for the A series, I found the A14 & A15 short blocks
just as heavy as the stock ca18de and L16 short blocks.

The A14/A15 are heavy nuggets but the L series heads are heavier than A series.

The early non pollution L16 is overlooked engine that can take large pistons
L18 crankshaft and a roller rocker NA20P heady from Alibaba for almost 2000cc

KA24de fits easily to give a cheap twin cam L series hybrid that can use webers.
This one is a highly tuned L series with Ka24de head that made 284hp @ high 7k rpm.
Built by Les Collins for a Perth dude that once owned my vb10 wagon.

http://lescollinsracing.com/images/Engines/Nissan4V.jpg

That is the Twin-Cam head that was just sold Sunday at auction for $5000


The auction title was Quote:Yes, that would be the LZ14 engine which was used in the 1973 Sunny PB210 race car


The auction description was a bit confused:
Quote:However, the Nissan R390 was made in the 1990s, used a V8 and was not a Sunny variant. The engine used in the Sunny Excellent was an L-series engine, and the twin-cam racing version was the DOHC LZ engine


All our previous LZ photos show square covers over the cam ends:


But Nissan Global explains Quote:Yep, hard to see, but the early LZ race car seems to have them. Here's a photo from the old ratdats site:


That seems to match the auction photo:





and final confirmation, the combustion face photo matches the photo from Nissan Global:


auction photo




Here's the last photo from the auction. I think its the exhaust ports

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  ports.jpg (24.49 KB)


  green top LZ20B.jpg (34.81 KB)


  PB210-LZ.jpg (74.97 KB)

Yup that's an LZ head and the price is actually really good.

Looks like the LZ14 16v cylinder head.

hi ddgonzal,

thanks for the extra info, much appreciated. here are all the pics i managed to get from the listing.

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WOW!

That's the rear Nissan race hemi AY12 engine. The DOHC version (AZ12 engine) was never made


Great pictures i never seen details like those. Too bad they didn't get a picture of the combustion chambers

* 1973 Nissan works engine
* 160 horsepowers @ 8,800 rpm
* Single-cam engine
* overhead valve (pushrod engine)
* dual rocker arms

Similar to the Chrysler Hemi, except it doesn't appear to have top-down spark plugs but rather they are on the side?

At the bottom of this magazine article page is the design for the DOHC A12 -- buy it's only a drawing

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  Auto Technica 1982 no. 164 E64F0468.jpg (192.29 KB)


  AY12 engine. The shape and size of the head cover are completely related E64F0467.jpg (91.24 KB)


  Crossflow OHV Head A12 E64F0430-1.jpg (79.36 KB)


  E64F0464.jpg (173.17 KB)


  Nissan Crossflow AY12 engine E64F0465.jpg (170.43 KB)