which engine/head to run on my 240z

[lady24d]

I am having trouble finding out which direction I should take. I have a 1973 240z and I also have a complete 76' 280z motor. n42 block with dished pistons and n42 head that I am planning to put in the 240. Question is should i use the n42 head with the su carbs or should I put the e88 head on the n42 block with su carbs. I also have read that maybe I should source an f54 with flat pistons and the n42 head. The plan is low cost and a fun street car maybe a few road track days but mostly a fun street car to drive while I slowly restore the body. With the low money in mind and since I have the 2.8 motor would it be worth settling for the n42 block with either the n42 or e88 head and carbs since I have it already or start looking for a f54 motor. Any input or advise would be great. Every post I read either on here or on hybridz all give great info but they get so side tracked it hard to read through them .

[lady24d]

I believe i just answered my own question after months of research it was right there in front of me. look for a f54 with p79 head 81-83 280zx which will have flat top pistons, then put a higher cam in, n42 head on and mate it with a t5 trans. Having a 10:1 na ratio is def. something I could handle for a fun street car. Could go to the turbo model motor but I'm starting to really like the old school L series carb sound,

[Travel'n Man]

If you currently own the N42 block why not just re-bore and put in flat tops........put then N42 head on and off you go! While you are in there you can add some other tweeks but since $ is low that would be the easiest and odds are the least expensive...........that way you will know you engine is good to go.

[240260280z]

If you currently own the N42 block why not just re-bore and put in flat tops........put then N42 head on and off you go! While you are in there you can add some other tweeks but since $ is low that would be the easiest and odds are the least expensive...........that way you will know you engine is good to go.

I agree with TM.

[lady24d]

I was thinking about that also. Been looking around for a rebuild kit and I'll need to hit up my local machine shop and get a quote from them for the re-bore and valve job. With the n42 head will having the FI holes effect anything.