E31 Head ?s

[jmortensen]

The head shims were available last time I checked. I think my machinist was going to order some through Isky or Comp Cams or Erson; one of the major cam manufacturers (pretty sure it was Isky) but as it turned out I didn't need them. They were something along the lines of $15 a set, and I think you could get them in .015 or .030 thicknesses. You just stack them when you need more than .030. I've also heard of people getting shim stock and cutting the pattern off of the bottom of the cam towers, but for the money I'd just buy them.

It's been a few years, but that is what I seem to remember.

Why are you wanting to run this E31? If you aren't racing, and there is nothing wrong with the E88, keep it. If you need to do work on the E88, then you could make a case for swapping. IMO it's just going to give you octane headaches on an L28 unless you go with dished pistons, but you'd be better off going with flat top pistons in an L28 with the E88 head.

If you're keeping the L24 for the time being, you might notice the difference, but there are so many other things you can do to make an L24 better (cam, exhaust, electronic ignition, MSD, etc) that will have a much better ROI than swapping an E88 for an E31, ESPECIALLY if it is the early E88, which it should be if that is the original head. Plus you'd have to notch the block or the valves would hit, etc. It would be a hassle. Too much hassle if you're not really trying to squeeze every last drop out of your engine.

You might want to give this a look too before you start spending $$$. I can't vouch for the accuracy of everything on the page, but I think he nailed my compression ratio; where other sources were saying 10.2:1, he shows 10.8:1. http://geocities.com/zgarage2001/heads.html

Jon

[dogma420]

Don't want to disapoint you man, but stuff like 'matching engine #s' doesn't really apply to Datsuns. It might apply to a corvette or a camaro/mustang, but I don't think it will apply to a Datsun if ever so don't worry about it.

Also, any Z manufactured after August is considered the next year rig. Yours is NOT considered a 1970 rig. I have a 9/71 240z and it is most definitely a '72. So I would modify your rig all you want, cause the 'classic 70' is only until about July or August of 70. Arguments? Start now!

Just letting you know, the 1970 240z all numbers match might be something to do, but unless you scam someone, this is never going to be something that your 71 is.

Just my 2 cents, and sorry, wasn't trying to sound like a d***,

Dogma

[mdbrandy]

Originally posted by dogma420

Don't want to disapoint you man, but stuff like 'matching engine #s' doesn't really apply to Datsuns.

Also, any Z manufactured after August is considered the next year rig.

Don't know where you're getting your info, but NA cars have their engine block numbers on an info plate on the car, so you can certainly tell which block went with the car. Not the head, however. And there've been many discussions on model years - seems to come down to what it was originally registered as. Which varies over the years. There is no strict cutoff.

My 2 cents.

[Bambikiller240]

Originally posted by dogma420

Don't want to disapoint you man, but stuff like 'matching engine #s' doesn't really apply to Datsuns.

Who told you this? Too Intense Restorations? Well, who ever told you that is flat out WRONG!!

No argument, just the facts