Captain caveman

pulled one from a 75 280z while I was getting parts for my car. I like how the manifold isn't webbed like the n47. I've heard with the n42 manifold I may get some more power with it. I think I'm going to swap it. One thing I noticed though was the tb was directly bolted onto the manifold. Will this make things a little more difficult for swapping? Or will this manifold bolt on and be a pretty easy swap?

duckyz

Are you sure it wasn't a cylinder head? The N42 cylinder head is higher compression and nice large flowing valves. Slap a nice cam in there with it....you'll notice.

I've been looking for one for awhile. If you can get two, let me know.

s/cL3.0

You should just do the 240sx T/B swap www.arizonazcar.com sells the adapter, and you can use the stock linkage..

flightforlife07

hey I can get an n42 I know fro sure but shipping is going to bge expensive i you want the guys email address let me know and I'll get it for u

Captain caveman

of course. I only pulled off the manifold, but know that head swap sounds nice now. I can probably get it for real cheap, but I would have to worry about getting it rebuilt

They also sell the gt40 turbo for only $400 and a very nice intake manifold for a 4barrel carb. I was originaly going to go for a carb conversion, but now I've decided to stick with the efi and tune it up. I probably will buy that. Thanks for mentioning. I didn't know arizonazcar make those.

I've also bought one of those cold air intake things on ebay. Probably wont really do much for my car. But cleaning the filter will be easy and I'll get rid of that huge airbox.

Captain caveman

Are you sure the n42 is higher compression? I tried it out on the l6 calculator and it's show the exact same compression as the n47

duckyz

The N42 has larger valves and flows better.

duckyz

If the price is right, shipping is a mute point.

Bleach

I'm not sure it adds more power or not. It 'looks' cleaner and doesn't have an EGR valve or Cruise control hookups ect.
LWW might know if there is any added flow bennefit inside of it. The throttle bodies were the same size back in '75 as they were in '83.

Captain caveman

well if it doesn't mess around with my compression I will seriously consider buying. That sounds pretty good. I just hope the head is still on the engine and that the junkyard wont charge me an arm and a leg for it. I have a feeling it may cost me though

Bleach

I've never heard that they have larger diameter valves. What they have is smaller combustion chambers so the valve stems are LONGER to reach down lower.
If they were ever referred to as having larger valves, it might be a comparison to an older 240Z head, not to a 280ZX head.

duckyz

That's what I was trying to say....If you're building a stroker, it's a good head. Coupled with a good cam on an otherwise unmodified L28, there should be a noticible difference. If you put all the internals in place (pistons, main crank, etc...) then you'll have a nice 10.08 : 1 motor (numbers might not be 100% accurate).

If I'm wrong correct me, please. I've been doing some research on this, 'cause it's the direction I want to go.

flightforlife07

smokin.geez@juno.com Thats the guy I talked to he wanted like $125 for the N47 so maybe it'll be around there. I don't know how many N42's he has but email him and it may take a couple days for him to get back to you...

duckyz

Are they finished or raw? Just scoping the details.........

flightforlife07

They are off a used car and need to rebuilt he whole head is there they just have miles on them

s/cL3.0

Just so you dont make the same mistake I did The smallest A/R housing they make for a GT40 is a .92.. Not I deal for a Z

Captain caveman

alrigtht, so where the heck do i go to get this manifold ported? I contacted a machine shop that bores engine blocks and ports heads but they wont do my manifold I think I'm going to drive out to a place I know that specializes in zs and see what I can have done. But seriously who do I contact to have this work. I'll try contacting a performance shop, but the performance shops I know really just cater to ricers and only do bolt on kind of work usualy that I could probably do myself

Fleaicous

What do you think of this head on ebay? http://cgi.ebay.com/ebaymotors/Datsu...spagenameZWDVW Would it fit on an 83 NA 280zx?

DoTheDrew888

It would fit on an '83 ZX. Only problem is your compression would be EXTREMELY high. Unless you have access to race gas (105 octane is about $5 a gallon) then you can't do it. It would give you a HP increase and should give you a lot of torque though.

lww

What he said...

10.5:1 is about as high as you can go on pump gas and even then, you're looking at 91 premium at a minimum.

DoTheDrew888

My engine is approx. 10:1 compression and I dont dare run it on anything but 93 octane.

Fleaicous

Whats a good head to get then? And whats the P 90 Head and how hard is it to get it?

DoTheDrew888

The P90a head is the head that came on the turbo engine. It is harder to get than the P79 or N47 but not too hard to find.

If you want to improve your performance just do what I did. Get an N47 head and put it on your engine. Your engine sould already have flattop pistons unless someone has swapped in an engine from an earlier year, check to make sure. An N47 head with flattop pistons will raise your compression to about 9.8:1 . You will have to use premium gas though and it would also be a good idea to get a bigger cam to go along with it. I've heard that some people have problems when they use the stock cam on a higher compression engine. Good luck man.

Fleaicous

Thanks where I live preimuim is cheaper for some reason? But i checked my head number and it was p 78 i think. But I think I will take your advice and take a look in some junkyards and ebay.