Why do you say to beware of Autolite 45 plugs? What should we be using?
On 2/19/10 12:38 PM, "spmdr@juno.com" <spmdr@juno.com> wrote:
> Just a few notes on the last two 260 engines I rebuilt.
>
> -The KB/ Silvolite Hyperutechtic stock replacement pistons are HEAVY!
> ...30 grams heavier than an NOS Speedpro.
>
> - Think seriously about having the engine balanced!
>
> - Also, the piston to deck height can be WAY out there!
> in excess of -.040!
> check it if you want to get the compression up near stock spec.
>
> - in spite of the Ford specs, I have yet to measure an unmilled 260 head
>
> combustion chamber much smaller than 56cc.
> ...yet another reason your compression may not be up to spec!
>
> BTW, I DON'T suggest you mill 260 or 289 heads excessively!
> ...Too much increase in blown head gaskets around the banana water
> passages.
>
> And IF you get your piston to deck close AND run 302 valves sizes AND a
> bigger than stock Cam,
>
> -Check your piston to valve clearance!
> Intake valve to piston clearance goes away!
>
> ...and beware of Autolite 45 spark plugs!
>
> ...I have yet to check for a better ( more acurate heat range ) plug
> in that heat range.
>
> DW
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