[Tigers] 260 rebuild

[MAURO D'ANGELO]

Why do you say to beware of Autolite 45 plugs?  What should we be using?


On 2/19/10 12:38 PM, "spmdr at juno.com" <spmdr at 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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