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http://xenonzcar.com/s30/heads.html

https://datsunzgarage.us/heads/

Read the "p79 mods" page on datsunzgarage. That's pretty much the best, money wise and performance. Shave it pretty good and shims plus earlier valves. A lot of guys on here run that head modded that way.

You can do all of that to get in the 10s on compression or just put flat tops in your block. 

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Well, looks like @Wally wins thread of the day, eh? Remember, never ask a wood nymph for a little head.

Anyway.

Like Cliff says, check out the P79, it has potential.

But an E31 . . . . . . . 
 

. . . . . . the E31 that has been on 3 engines I built for my race car from 1989 to now.
 

It breathes very well. Dave at FloTechnics ported it for me, larger valves, cc'd the chambers, and had the head, intake and exhaust on his flowbench. 

 

 

BEAA16AD-3BDD-4E36-BA7E-5DED6B5FB1D1.jpeg

Edited by Racer X
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15 minutes ago, Racer X said:

 

It breathes very well. Dave at FloTechnics ported it for me, larger valves, cc'd the chambers, and had the head, intake and exhaust on his flowbench. 

I couldn't find him with Google. Do you have a link or better contact info?

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@Racer X would you have any pics of the chambers after the porting? I have one I started grinding on after bigger valves were done but I got skeered I's gonna ruin a nice head. 

I'll get it out tomorrow maybe, it's cold down here. Damn near 40F out there now. Brrrrr...

Take some photos of what I've done and what I need to do

Sorry for the hijack @Wally but at least I didn't make any fellatio jokes. It was HARD. LOL

 

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13 hours ago, Patcon said:

I couldn't find him with Google. Do you have a link or better contact info?

Dave Endrigo, Poulsbo, WA.

The Flow Technics business has evolved, first to Flo Cat, then to EPD Corp. It looks like he is involved in engine development, but I haven’t talked with him in over 20 years.

He has a Facebook profile, but I’m not on Facebook, so can’t contact him.

 I do need to reconnect with him, as I read recently that his younger brother, whom I went to high school with, has passed away.

Edited by Racer X
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10 hours ago, siteunseen said:

@Racer X would you have any pics of the chambers after the porting? I have one I started grinding on after bigger valves were done but I got skeered I's gonna ruin a nice head. 

I'll get it out tomorrow maybe, it's cold down here. Damn near 40F out there now. Brrrrr...

Take some photos of what I've done and what I need to do

Sorry for the hijack @Wally but at least I didn't make any fellatio jokes. It was HARD. LOL

 

When I get some time I’ll try to snag a shot or two. The head has been sitting on the workbench for a few years, waiting for another bottom end to sit on top of.

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9 minutes ago, Jabronie said:

Isn't the p90 best right behind the one for $17k for the L28's?

Sent from my Pixel 2 XL using Tapatalk
 

Seventeen thousand bucks for what head?

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2 hours ago, Racer X said:

Seventeen thousand bucks for what head?

 

22 minutes ago, jonbill said:

Os giken TC24 is that sort of money. 

P90 is a great head. My one is anyway 🙂

As @jonbill mentioned, the OS Giken head is the pricy head. 

http://www.speedhunters.com/2013/02/engine-porn-os-giken-tc24-b1z/

https://www.thegentlemanracer.com/2013/11/os-giken-releases-l-series-head.html

I don't know if one for the L series is currently available, so I'm not sure if you could get one for just $17K.

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1 hour ago, jonbill said:

Os giken TC24 is that sort of money. 

P90 is a great head. My one is anyway 🙂

 

37 minutes ago, SteveJ said:

 

As @jonbill mentioned, the OS Giken head is the pricy head. 

http://www.speedhunters.com/2013/02/engine-porn-os-giken-tc24-b1z/

https://www.thegentlemanracer.com/2013/11/os-giken-releases-l-series-head.html

I don't know if one for the L series is currently available, so I'm not sure if you could get one for just $17K.

Oh yeah. Isn't that head made from unobtanium? 

I can only dream of ever having something as awesome as a setup like that. 

There is that guy who made his own twin cam head for L series engines, 3D cad design, custom casting, CNC milled. I think that setup is even more money.

Of course you can spend plenty of money on an E31, P90, N47 . . . . . . . I think I'm into the E31 I have at least two grand when I built my first race engine. Other than new valves (missed a shift coming onto the front stretch at Seattle, on a new bottom end, kissed the valves - now I have a rev limiter) and guide seals, and later a different cam, I haven't spent any thing on it. It has been sitting since the last bottom end had a crank break between the last main and number 6 rod (the second in about 20 years of racing my Z on the West coast) at Thunderhill about 12 years ago. I am thinking of using it, and the race induction setup paired with a header and a bottom end I built for the brown car when I was married to Mrs, Racer 1.0. That engine was going to get a small chamber E88 head I have, but haven't finished yet. It is ironic that when I had the first crankshaft break, it was when I was building that other engine, and was pursuing a championship. So instead of finishing the E88 head, I put my E31 race head and intake/exhaust on it, and raced one meet with it. We had a long enough break before the next race that I was able to build another engine, and swap everything back. In my zeal to win the championship the engine got sidelined.

Then I divorced Mrs. Racer 1.0, bought some property, stayed focused on racing and the brown Z and the engine got parked.

That was about 26 years ago, more or less.

I met Mrs. Racer 2.0 about 23 years ago, and we wound up selling my place, and buying the place we have now, built a house, and the car(s) have been patiently waiting.

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16 hours ago, jonbill said:

Os giken TC24 is that sort of money. 

P90 is a great head. My one is anyway 🙂

The P90 head is pretty much a P79 head without the exhaust liners. You still have to shave 2 mm and shim everything and use the early valves. They both are great heads. 

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Yes, agree p79 also very good. Being pedantic, you don't *have* to skim it and shim it. There are better (if more expensive) alternatives. 

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2 hours ago, jonbill said:

Yes, agree p79 also very good. Being pedantic, you don't *have* to skim it and shim it. There are better (if more expensive) alternatives. 

What are the alternatives to skim/shim?  Budget be damned.

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1 hour ago, grannyknot said:

What are the alternatives to skim/shim?  Budget be damned.

Work by a talented machinist who can also weld well.

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You guys haven’t even mentioned the best head yet - MN -47 . Because it wasn’t in the Z , people forget about it . It has the best all around combination for a street motor . Maybe not the best race head , but best bolt on for power with the least amount of work . Small chamber - high quench , good casting .

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