aluminum heads

[drolston]

c

Originally Posted by tubman

I know it is highly unlikely, but we seem to have had a common problem. What kind of ignition are you running and have you checked the timing curve? I always thought it was the MSD setup, but this makes me wonder (but just a little, to be frank).

Crab distributor in very good mechanical condition regarding advance mechanism with 12v Pertronix. Spark is advanced by 3 degrees (one and a half marks on the distributor body). No sign of pinging or spark knock. Plugs show a little lean (grayish beige).

These Offy heads have been around for 50 years so seems very unlikely that such a problem would have gone un-diagnosed. But then, we just discovered that anti-bacterial hand soap increases susceptibility to infection.

Anybody out there with Offy heads that does NOT have cooling problems at idle?