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Building an l28, need modification advice


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Hi 

 

I am restoring a 280z and I am at the point where I need to decide what to do with the engine. I have a stock l28(N42 block, N42Head). The engine is out of the car, I have taken the head off and I am going to rebuild the whole thing. 

 

Scenario 

The car is going to be my daily driver for the next few years then after that I plan on it becoming a track car. Therefore it needs to be comfortable to drive but I also want to set myself up nicely to turn it into a track car in the future. I want it to be naturally aspirated and run of pump fuel. I plan on running triple Weber 45's and I have a ZStory race header already. 

 

Current Plan (Please let me know any of these are a bad idea)

 

  • I am going to clean up the block and give it a light hone. 
  • Get the crank balanced
  • Get the head ported and polished.
  • Skim 30 thou of the head to bring CR to low 9's, I don't want to add cam tower shims. (Is this worth doing or am I better of not skimming the head? What power increase would I get?)
  • Replace all the bearings, rings and valve stem seals.

 

 

Question

As the engine is apart, what other modifications/upgrades to the block and head would you recommend for my scenario? Potentially looking into a cam. I would prefer to do them now to the engine so I don't have to take it apart again when I turn it into a tack car.

 

 

 

 

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Hi 

 

Thank you for the advice. I already have the how to rebuild your Nissan engine book. I have now just ordered the how to modify your Nissan engine book.

 

clarkspeed is it worth the extra cost of getting flap top pistons over skimming the head to rais the CR? I am in the UK new pistons would be £300 from zcardepot where as skimming would be £50. Plus I am going to be running the stock cam so with flat top pistons the CR will to high?

 

 

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If you have the room I would get a second block and use it for your future track motor build while using the one you currently have in the car. A good tune-up and a few inexpensive mods should give you enough to both enjoy the car and add other non-engine mods to the car as you want. A second engine would  extend the life of the track motor depending how much you get into the build (mild, mid and full race}.  The closer ot gets to a track only build the shorter the life cycle (rockers, springs, bearings)

Edited by gnosez
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