I spoke to Dick Tillinger a few months ago about this problem and he said it
was the antifreeze available in the 60s, 70s and early 80s that caused the
problem. They weren't properly formulated for aluminum heads.
I also believe it was careless (cheap) owners who didn't change the A/F
frequently. It also may be sped up by improper grounds.
I have several heads that are useless because of corrosion sitting in my
basement. Great to practice porting on them.
Mike
----- Original Message -----
From: "Fergus OFarrell" <FOFarrell@qtww.com>
To: <datsun-roadsters@autox.team.net>
Sent: Monday, June 25, 2001 6:53 PM
Subject: a question for the experts
> I have been idly keeping track of some 'rebuild the head' stories, and
from
> experience with other stuff, I am wondering if the stories of 'gross
> corrosion in internal passages' is not a product of rust, but of
> electrolysis. From a good bit of work on boats, one quickly learns
> grounding is paramount, or else the electric charge generated by water
> friction (and stray wiring connections) will eat at the most susceptible
> metal. (or something crucial) While boats install zinc plates to be the
> sacrificial unit (regular replacement required), every time I hear of
water
> passages eaten to the thru-wall point, I get the feeling that maybe the
> grounding problem that roadsters have is the culprit. A possibility?
Words
> from the experts?
> Fergus O, 69 2000
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