I recently sent my head and block off to a machine shop to get a bore, valve job, cleaned, etc. When I got it back, it was all bead blasted and looks great. Tonite, i went to a put a aftermarket cam into this d16z6 head and the cam now wont spin freely. One of the lobes hits the side of the head. Also, the journals now are not shiny, but dull. There are no digs, so is this okay or will it be a problem? Also, this cam works fine in an untouched, stock head...why would this be? I know some heads use bearings, but these dont; so what could it be?

 

ttt

 

one of the lobes hits the head? take some pics

 

so does anybody know why my head would be getting in the way of the cam?

Here is the obx cam and where it hits.


Here is the stock cam, that clears


Here is where it hits.



I had this in a z6 head before without any problems, but this head seems to have an issue even though it too is from a z6. I'm going to look at the castings and measure the differences between the head, but until then....

 

ahh i see. damn, interested in knowing whats going on; get to measuring..lol
are all vtec lobes hitting?
wall thickness diff? wall to cam bore diff.?

 

you sure they gave u back a z6 head. is that a vtec lobe hitting? dont really know much about the z6

 

yes, that is the vtec lobe hitting. It does it only on cylinder 2 and 3. 1 and 4 are fine. I think I may just do a little grinding on the head to let it clear. I know grinding sounds scary, but its barely catching. Anyone think this is a horrible idea?

 

Contact OBX.....let us know how it goes.....

 

i think grinding would work, but i would find try to find why its hitting.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Oleg &raquo;</TD></TR><TR><TD CLASS="quote">Contact OBX.....let us know how it goes.....</TD></TR></TABLE>
it's not a problem with the cam, it fits in every other z6 head I have, but I had this one reworked a little so im using it. I'll just grind a little.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mmuller &raquo;</TD></TR><TR><TD CLASS="quote">i think grinding would work, but i would find try to find why its hitting.</TD></TR></TABLE>
I agree, but it is barely hitting. I think it's just a small flaw in the casting, i dont know what else it could be. It is definetly a d16z6 head. Knowing that, I could measure; but what's point? I still know I need to grind some. I'm open to your input, which is why i started the thread, so if im missing something, please let me know

 

scary...

 

If you are saying that the head was worked on......is there a possibility that cam journals were cut??
.......See if you can compare it with another head and measure the tolerances.....
Tell us how it goes. GL.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b20vrex &raquo;</TD></TR><TR><TD CLASS="quote">scary... </TD></TR></TABLE>

agreed

I would get a stock cam and see if it does the same thing.

 

Ive heard of crower 3's hitting at the same spot. Just grind a little off the head.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Oleg &raquo;</TD></TR><TR><TD CLASS="quote">If you are saying that the head was worked on......is there a possibility that cam journals were cut??
.......See if you can compare it with another head and measure the tolerances.....
Tell us how it goes. GL.</TD></TR></TABLE>

I never really thought about the journals being cut. It's a possibility I'm certainly hoping isn't the case. I will check that though
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Blown90hatcH &raquo;</TD></TR><TR><TD CLASS="quote">

agreed

I would get a stock cam and see if it does the same thing.</TD></TR></TABLE>

Look up at the pics. I did it with a stock cam and it didn't hit


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Furyof4 &raquo;</TD></TR><TR><TD CLASS="quote">Ive heard of crower 3's hitting at the same spot. Just grind a little off the head.</TD></TR></TABLE>
I guess I'll just measure to see if the journals were cut and if not, grinding is what I'll do