Excellent breakdown. This should be sent to 311s.org to be put in the
wiki section!
sidney raper wrote:
> The valve cover development:
>
> Single carb 1500s - chromed valve cover with a chromed D shaped breather -
> unvented cover.
>
> Dual carb 1500s - finned aluminum valve cover with no spot for the vent tube -
> round chromed open breather.
>
> Late dual carb 1500s and early block vented 1600s - finned aluminum valve
> cover with spot for the later breather tube cast but undrilled - either a
> round vented breather cap or a tower with a fitting to vent to the
> aircleaner.
>
> later 1600s - finned aluminum valve cover with breather tube and unvented
> round oil cap. These also had the back end of the cover modified to be
> "clipped" a bit to clear better when removing the engine from the engine bay.
>
> The Silvia had the finned aluminum valve cover with Nissan on it rather than
> Datsun. I have not noted variations in it, but there likely were a few...
>
> Sidney Raper
> 1964 1500 (still a project.... sigh....)
> 1967 SRL311 00076 (alive again!)
> Jacksonville Florida
> http://www.geocities.com/roadsternut/index.html
>
>
>
>
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