Cylinder head question.

[e_racer1999]

^^ so do you have the square header on your round port head? how well is that working for you if you do, 'cause that's what i plan on doing (round head, square header)

[MrMarcDude]

Im sorry, i typoed. It is a N47 L28 engine. When i bought the car it had a cracked cylinder head so it definately needs to be replaced. One thing i noticed is that the N42 he would sell me doesnt come with the cam towers. Would the towers from my N47 work with it?

[240ZMan]

^^ so do you have the square header on your round port head? how well is that working for you if you do, 'cause that's what i plan on doing (round head, square header)

The N42 and E31 (along with E88) are all square port exhausts. My header is square as well.

[beandip]

MrMarcDude. About the question on the cam towers . I suggest you go to the expert phred . If any one knows he would , and I trust his knowledge. He has been this business for a long time and does it for a living and is vary good.. send him a PM

[e_racer1999]

The N42 and E31 (along with E88) are all square port exhausts. My header is square as well.

jeez, i'm on a roll!

thanks

[MrMarcDude]

Im somwhat leaning towards the E88 head. So all i pretty much would have to do is notch it for the EFI? How much do you think that would cost, or could i do it myself? (Im damn good with the dremel) Thanks guys

[240ZMan]

MrMarcDude, if you're interested, I have an N47 head from my donor L28 in what looks to be very good condition. PM me if you're interested and I'll give you more details.

[JEFF]

To notch the E88 head for the injectors use a colored grease or spotting

die. Smear it on the intake manifold face and slide it on the mounting studs

to "spot" the intake face shape on the head. Scribe the injector area with something sharp as not to lose that shape and be able to wipe the grease/spotting die off before working. See the fuel injected head for the

notch angle. Good luck - you should do fine.

- Jeff

[Ed]

Here is a picture of a N42 head that might help you do the notches. Ignore the number as those where used for something else.

[MrMarcDude]

You guys have been a huge help. Thanks a bunch! I acctually have a cracked N47 head to work off of, and use as a reference. When i scrap that head, is there anything i should take off, and keep for spare parts?

[Coastieee240z]

Keep in mind there are two versions of the E88. The later ones from 73 have a larger combusition chamber and hence a lower CR. They're not bad, but not necessarily desirable either.

So I have to ask why you want to switch your N42 head to an E88? While there's nothing wrong with an E88, the N42 has larger valves and about the same combusition chamber size as the better of the E88s. If you're planning to rebuld a head and add a cam, I'd suggest you keep your N42 and use the money you were going to spend replacing it towards that project.

BTW, I just put an N42 head on my L28 dished pistons with a mild cam. Much improved high end power and almost no loss of low RPM torque. I replaced a stock E31, FWIW.

Ok sorry to bring this thread back from the dead but it answered alot of my questions yet at the same time confused me more.

Reading 240ZMan's post above makes me think I should just stick with the N42 Block and N42 head combo L28 that I currently have in my '72 240 and just throw the fuel injection on it to get rid of the pesky carbs that make cold starts so fun, get smoother power and call it a day (for now:devious:)

Then I read this excerpt from the word document posted by Webdawg1 (thanks for the link BTW!! ) which states....:

"E31 - '70-'71 240Z

• Square ports

• Smallest combustion chambers of all Z-car cylinder heads

• Small intake and exhaust valves

This cylinder heads performs best with the addition of big intake and exhaust valves. A popular performance use of this head is matching it up with a 280Z bottom end. While this gives you better intake runners and an immediate compression boost (somewhere around 10:1), this will require the use of high octane fuel. For most of us this would not make for an ideal daily driver. But if reckless abandon and blown differentials are what you're after, go for it."

...and now I'm confused it commented on the E31 as being a popular swap and increasing it to 10:1 CR and mentioned blown diffs even :eek: yet by reading the post above it's not as good as the N42 head is with the addition of a mild cam ?? I realised the E31 head would have to be notched and modified with larger valves pain in the arse and pricey I'm sure but if that was done prior to installation and you threw a cam onto it afterwards wouldn't it then produce more power than the N42 head ??? My other concern is will the stock 280zx efi system work with an E31 head having that high of compression even if the valves are modified to the same size,etc. or would you then need an aftermarket tuneable ecu ?? **Note if it makes a difference to it working or not there will be a 60MM TB and a Turbo AFM to go with it.** Also I still need to aquire one (I'm pretty sure even though I have LSD the size looks like an R180), but I also thought the R200 diff would hold up to that kinda power and not blow up ?? :nervous:

Obviously it's not the combo I'm going to want to run with any sort of turbo setup, which is on the list, but that's so far down the road for me anyway that I'm thinking I can take advantage of higher compression until then. Remove it when I'm ready and spend a crapload on a TT setup that will have to be custom fabricated almost entirely I'm sure and I'm not that good with a welder yet and don't have the money to have it done so it'll be awhile...

P.S. I already have an E31 head on a 71 240 parts car in the garage so I don't have to buy it from anywhere. I'm just not sure now if it's worth the trouble to modify it for the L28 ??

[Coastieee240z]

bump