nope, not worth it. lots of work for 0 gain. and i would bet your uncle is more of a muscle car guy. i dont think he really knows Zs.

 

i have headers and full exhaust on my car from msa.. well worth it...

 

Pretty sure that screaching sound is from a clogged muffler or cat converter although the 260s I don't think had them.

 

they had a muffler and resonator i do believe.

 

idk but everyone says that the engine can't breathe right

 

On a 240Z with SUs you don't really need headers. They will only add more noise to your exhaust.

My suggestion would be to take off the factory exhaust manifold (and intake) and replace the gasket on the side of the head. Re-install both then have a professional install a 2.25" exahust pipe and new muffler.
call it good

 

i dont know why i didnt think of it before, but i actually have a pace-setter header for sale. its round port, no O2 sensor, basically perfect for a 240Z. let me know if your interested, i can probably do it for about 80 shipped

 

hey pm me and we'll talk or something cause i'll definently buy them if you can get it to me but i have to go to work now(finally found a new job) but i have the money in my account i just need to know whats going on and who to send the funds to

 

hey and can you take a pic of what it looks like please?

 

Its round port. Weren't all Z car heads square port up until 1977???

so for a 240Z you need a square port header.

 

idk man, mine are round port 74

 

fyi
HEAD # VOL. C.C. INT VALV. EX VALV. EXH. PORT PROD. DATE
E31 42.4 42 33 square ex 10/69-7/71
E88 44.7 42 33 square ex 9/71-7/72
N33 47.8 42 33 square ex 8/72-7/73
N33/P50 47.8 42 35 square ex 8/73-8/74
N42 44.6 44 35 square ex 9/74-7/77
N47 44.6 44 35 round ex 8/77-3/78
P81 44.6 44 35 round ex 2/79-6/80
P79 53.6 44 35 round ex 7/80-
P90 53.6 44 35 square ex 12/80-7/82Turbo
P99 53.6 44 35 square ex 8/82-Turbo Hyd
copied from zhome.com

 

i forgot i swapped motors. lol, thats why they are round port. which i believe means i have a p79, which kinda blows for the round ports, but seems to flow pretty perfectly matched to the turbo head so MEH! what the downside of mixing the port shape with the header shape? i could maybe see using the round port on the square head being a tiny bit turbulant, but i dont think thered be a problem using a square on a circle.... idk. inputs damnit

 

The downside to missmatching the square and round is... blown exhaust gaskets.

Round head with square exhaust sometimes works.
Round header on the 'larger' square head port does not ever work.

then you have to ask yourself, which exahust gasket do you use?

 

id say use square. i used the square and square on my head thats round since the whole turbo thing, havent blown poopy. but maybe these headers arent for him. which blows cause i want to get some ****in money for all these parts i have laying around.

 

well what other parts do you have lying around?

 

not much for a 240Z. i got a zx distributor with ignitor if ur interested in upgrading your spark system. and i have 3 screw round top SU carbs. but thats aboot it that you would be able to use

 

when was the last time the thing had a valve job? go ahead and replace the exhaust gasket. could also use a tune up.

 

ok but i have to wait till i get my paycheck and do you know where i can get some cheap louvers for my z?