Z6 Block w/ Y8 Head
 

Ok so the other day I picked up a Z6 block and Y8 head for $50. The plan is to toss it in to my 90 Si but there is only one problem, I have no ------- clue where to start. I have swapped stock motors out in several different cars but when it comes to swapping a different motor I am clueless and I figured this would be a good place to start. Besides putting the motor in and all of that bullshit, what am I going to need to make this work? I am just trying to get all of my bases covered before I put it in and get way over my head with stupid bullshit I decided to ignore before I started.

Re: Z6 Block w/ Y8 Head
 

The z6 bottom is pretty much setup the same way as your stock a6 block, biggest difference is the temp sensor is moved to the thermostat housing so you need to extend that plug. The y8 head will bolt on to the z6 block no problem, and your stock a6 dizzy will bolt right on to the y8 head as well. It's pretty much just a straight forward swap, just like changing a stock motor. Just remember to swap in your obd0 injectors, and all your wiring should be fine since it's an Si. As for vtec activation, well that's up to you how you want to do it. Could go old-school with the toggle switch to activate it, or drop a butt-load of money for a vafc, or do a vtec ecu swap. All up to you on how much work you really want to put in it.

Re: Z6 Block w/ Y8 Head
 

you didnt say anything about ecu, but i always assume obd1, you need a conversion harness. also, the timing is differant when using z6/y minime. i think its 4° off one way.

Re: Z6 Block w/ Y8 Head
 

So for the most part whatever didnt come with my z6 block and y8 head I should just snatch off of my a6?

Re: Z6 Block w/ Y8 Head
 

are you going to turbo or run n/a?
if n/a, then just put the y8 head on the a6.
but since ur on hmt, then the z6 pistons will yield a lower c/r.

Re: Z6 Block w/ Y8 Head
 

Well for the moment I am broke so it will definately be a few months before I can afford to turbo it, that and I have a dsm that pretty much owns my wallet. I will probably just toss in a set of ZC pistons to bump up the compression and give it a little bit of pep for now, its all going in my daily driver which I drive about 150 miles a day so I need to keep it good on gas but wouldnt mind having a bit more pep, that and my a6 has over 200k on the clock :6

Re: Z6 Block w/ Y8 Head
 

Yeah...you're right...almost forgot about that one. Been awhile since i built a D-series ;D Get an adjustable gear if you want to bring cam timing back to where it should be, or use a y7 gear (I believe...not 100% anymore) for the cheapo side.

Re: Z6 Block w/ Y8 Head
 

and dont forget when using an 88-95 block and a Y head the head stud/bolt nearest to the vtec solenoid has to be shorter.

Re: Z6 Block w/ Y8 Head
 

D-series head studs are block-specific, where B-series are head-specific.

Most people learn B-series because it's Hyped and fluent, then ASSume for D-series... when they find out otherwise, they still think in head-specific terms "except that one bolt." Uh-uh.

Re: Z6 Block w/ Y8 Head
 

Ok so im going to need a set of z6 head bolts, and I have just one more question, I looked around and from what I have seen a z6 block w/ y8 head and zc dome pistons is gonna make a stupid hight compression ratio, anybody able to confirm this so I know what I am getting in to.

Re: Z6 Block w/ Y8 Head
 

This should help

http://www.zealautowerks.com/dseries.html

Re: Z6 Block w/ Y8 Head
 

when putting a Y head on a 88-95 block you have to use the shorter Y head bolt/stud in that top left corner, or use a washer. what does B series have to do w/ it??? i know ---- about B's, all my experience is with D's.

Re: Z6 Block w/ Y8 Head
 

Ok well, I did that compression calculator like the other ones and came up with similar results 12.61 to 1... I am some what of a noob when it comes to stuff like this but I just have to think that it is too high to run on regular and without a tune, if anybody has any informative links it would be most appreciated, and if you feel like flaming because my lack of knowledge then flame on.

Re: Z6 Block w/ Y8 Head
 

your calculation is way off, i dont feel like using the compression calculator but off the top of my head i would say z6 block y8 head, and stock gasket will be around 9.8:1 unmilled.

Re: Z6 Block w/ Y8 Head
 

im doing the same setup just vitara pistons and eagle rods. So you would go with head bolts for the z6 block? and should work fine? and any were ther is a good write up n doing a obd0->obd1 swap i have a 90 si also

Re: Z6 Block w/ Y8 Head
 

Ok well since this is my first swap I will probably have it all ready in a week or two or three, whenever I get off my ass and do it, I will probably post up some pics, and let you guys know how it went.

Re: Z6 Block w/ Y8 Head
 

yeah, use all z6 headbolts, and do a leakdown test on cylinder 4, why is it so hard to comprehend that 1 bolt/stud has to be used from a Y motor. i could explain why, but i would rather watch yall crack the block trying to get it to tighten down flush to the head, or tighten to proper tq and not have compression in #4 cylinder. good day.

Re: Z6 Block w/ Y8 Head
 

no i undersand about the one bolt just the rest would be the z6 bolts and the one from a y8 head/block. So othere then the bolts everything else bolts together just fine?

Re: Z6 Block w/ Y8 Head
 

yes, with the exeption of the timing, you will need an adjustable cam gear to correct the timing. why not just get a z6 head????

Re: Z6 Block w/ Y8 Head
 

got the block and head and turbo and flywheel and turbo timer and dizzy in a trade whynot use it and upgrade from my a6?

Re: Z6 Block w/ Y8 Head
 

Well I decided to say ---- it and traded the y8 head for a z6 head straight up to keep ---- simple, will start rigging from there if need be.

Re: Z6 Block w/ Y8 Head
 

It would be around that normally, but he said he was adding zc domed pistons...so he was closer in his original number.

Re: Z6 Block w/ Y8 Head
 

oh, true, if he is using dohc zc pistons it will be higher than his estimate though. but i didnt even catch that.

Re: Z6 Block w/ Y8 Head
 

Yeah, I was told it was a cheap easy way to gain compression and horsepower especially since the whole motor is currently apart. The big question on my mind is how well will all of this work out, when it comes to modifying ---- I have pretty much been restricted to my DSM simply because of the amount of modification you can get for the money.

Re: Z6 Block w/ Y8 Head
 

hope you dont plan on running a stock ecu w/ that high compression.

Re: Z6 Block w/ Y8 Head
 

Either going to get it tuned or rig a vafc on to it and hope it works, any advice on which would be the better option?

Re: Z6 Block w/ Y8 Head
 

well, AFC isnt going to help the timing at all. i highly recommend a chipped ecu and dyno tune.

Re: Z6 Block w/ Y8 Head
 

Wouldn't this only be true if you were mixing cam gears and cams?

Re: Z6 Block w/ Y8 Head
 

yeah, i just made it up to confuse everyone :6

Re: Z6 Block w/ Y8 Head
 

Somebody PM Shreik that he doesn't need a timing light, and then PM Inquisition that I've never denied anyone help.

Re: Z6 Block w/ Y8 Head
 

what about me ???













------- :P

just pmed shreik and inquisition..

Re: Z6 Block w/ Y8 Head
 

pm's sent.

Re: Z6 Block w/ Y8 Head
 

buk, you're asking me about some Mustang 1000+ miles from me, that lost a transmission due to neglect. How the ---- am I supposed to know?

You want to go the turbo Mustang route? www.turbomustangs.com is covered up with more hardcore ----------ers than HMT. I hate to say it, but it's true.

Re: Z6 Block w/ Y8 Head
 

duuuuude u have some work ahead of u, u have an obd0 ecu, obd0 harness obd0 d16, as for shortblocks obd doesnt matter they dont have knock sensors, but u need to go buy a n obd2 ecu and harness to use that shitty d16y8 head, get a z6 head, they can run crome since its obd1, they flow better but grab the im from ur d16y8 head and ur good to go :6

Re: Z6 Block w/ Y8 Head
 

this gets better everyday. ::)

Re: Z6 Block w/ Y8 Head
 

Yeah, i just said ---- it and picked up a z6 head to keep ---- simple