RE: Cyl. Head questions/Follow up post.....

[pjpere@xxxxxxxxxxxxxxxx]

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Gary H. wrote:
> 
> I've read numerous times over the years that heads that were run with 
> leaded gas in their history have naturally built up protection from the 
> lead deposits that had built up on the valve seal area over time. As 
> Dave C. pointed out, just a little of that lead goes a long way in 
> protecting the valves!
> 
> I've also read that running unleaded it would take *lots and lots* of 
> prolonged extreme high rpm use to cause a problem, not driver style use.

I've faced problems apparently due to the unleaded gas (it's my best 
guess at least). My 1964 Fury had a new short block (is that the correct 
description?; I mean everything new below the heads)318 polyhead 
installed 1983 (the last the Finnish dealer had). After 40000 miles or 
so a cylinder was missing pressure due to a leaking valve.

By the way, a new engine is  already assembled, and the plan is that I 
and my car meachanic will start assembling the car early June. The heads 
have now hardened valve seats!

Pekka Pere
Fury 64
Valiant 65
Finland

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