Spec for head thickness is 4.528-4.530. Yours has been cut about 60
thousandths. One of the tricks though is trying to determine how much was
cut from the bottom and how much may have been cut off of the top. I don't
know an easy way to measure that - If anyone does, let me know. The amount
that was cut off the bottom affects compression ratio. I think I could
figure it out from the diagram in the shop manual which show the port cross
section but it requires more math than I can do after a full day of fighting
with a unix box. You can cc the chambers though to figure compression
ratio.
The easy part is that you know you need to shim the cam towers by total
amount shaved off of both top and bottom - in your case you need to shim 60
thous. to restore the cam/crank distance to stock - assuming of course that
you're not using any sort of over sized head gasket.
Hope that helps.
Brian '69 2000
http://web.tampabay.rr.com/oilleak/
-----Original Message-----
From: owner-datsun-roadsters@autox.team.net
[mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Allen
Blackmon
Sent: Wednesday, April 17, 2002 1:46 PM
To: datsun-roadsters@autox.team.net
Subject: Non smog head and measurements
To List,
I prove I am a complete moron when it comes to engine measurements and head
wear, I present the following. In my continuing quest to get my 1970 2000
back on the road, I have a question about cylinder heads. Is a head that
"averages about 113.5mm or about 4.4685" in good shape or not? What would I
need to know? I've got the smog head and was considering replacing it with
the above measured non-smog head. Is it worn? Good shape? Help!! I have
no idea what the above means in relation to cylinder heads.
Thanks!!
Allen
_________________________________________________________________
Chat with friends online, try MSN Messenger: http://messenger.msn.com
/// datsun-roadsters@autox.team.net mailing list
/// datsun-roadsters@autox.team.net mailing list
|