F54 block and a N42 head?

[NATURALLYASPIRATED]

What head would be best for naturally aspirated build up?

a n42?

right now i currently have a n47 head, with the n42 would it raise my compression?

[TrumpetRhapsody]

That's not an easy question to answer without more about what you're looking for from your NA build. This has been covered. do some searching.

 

The E88 is good for a high compression build, the N42 is a nice head for a gentle street build. Generally... but search.

And no, the N47 is an N42 with exhaust liners, among other things.

[1 fast z]

The heads that will bolt onto a L series block, that are accessible, include the following, starting with the

earliest to the latest:

 

E30= This head came on Japanese Domestic Market (JDM) cars only. It was available on the 2.0 L

series engine. This head has 37cc chambers, and SMALL intake ports. The valves are also small in

diameter. Bronze seats as well. This head would be a screaming High Compression head if someone

would take the time and put the bigger valves and do a decent port job on it as well. This head also does

have a high quench design as well.

 

E31= This head is available on all 240z's up to about the month of 10/70. There were about 10,000 of

these heads made. This head has 42cc chambers and is also a high quench design as well, much like the

E30, except this head has the 35mm Intake Ports and the larger valves. E31's had bronze seats as well.

 

E88= There are actually 3 variations of the E88. The first variation is of which it is the EXACT same

head as the E31, except it has the E88 casting code.

 

The second is which it has the large open chamber to where it is a 47 cc chamber now, and not the 42.

 

The third is where it has the open 47cc chambers and also has the large Ex valve inserted, the 260z's got

these, and to where the bore had to be notched to accept the larger valve.

 

N42= This head came on all 75-76 and EARLY 77 cars. It has the 47cc chamber, and this head is a

fully open head. This head was used on a fully dished piston, to where no quench was used. It has the

largest of the valves much like all 280's did. 44mm intake and 38mm ex. This is the last of the L heads

that came with bronze seats. This head has Square ex ports, and has the Injector notches as well.

 

N47= This head came on all mid 77 through the 1980 z cars. It has the same exact characteristics as the

N42 except that it has the cast in ex liners. These liners were cast in place, for the reason that when the

motor is running, these liners get so hot that they glow red hot, and with that you get the advantages of

them burning off the hydrocarbons that are left over in the exhaust charge. This is the first head to have

hardened seats put in all of the valves.

 

P79= This head is a Good head. This head came on all 81-83 NA cars. This head has the Ex liners cast

in as well, but the chamber is a HIGH quench design. The chambers are 53cc's. This head when used

with a Flat top block will yield a HIGH quench design, and will reduce detonation.

 

P90= This head is also a good head, as it has the same exact characteristics as the P79, except that it has

the non-linered square port ex ports. This head is wildly used for NA setups also, to where most shave

.08" off of the deck, and then insert the 75-80 valves to take up the valve lash, and then put cam tower

shims to make up the timing chain slack.

 

P90A= There are actually two variations of the P90A. One is the solid lifter style to where it is exactly

like the P90. The second is also exactly like the P90, except it has Hydraulic lifters.

[NATURALLYASPIRATED]

Thanks alot you guys that answered everything i needed to know..

I have searchecd but find different variation of answers and some say this and some say that.

 

thanks again