Ok, I'll continue with my personal top 3 suggestions to close the engine performance levels regardless if they are 'SP' or standard.
1) As in previous thread machining of the block face to allow the effect of a longer or shorter con rod to be neutralised. This also would equalise any crank and piston height variations. Also good to revive old or damaged blocks. Approximate cost I estimate around £30 to £40 for machining. It would also be very easy to police using a level (0) to minus tolerance on piston protrusion.
2) Machining of the head face to achieve a given cc. This would neutralise any casting variations in the head combustion chambers. Also revive any warped or damaged heads. Approximate cost I would estimate at £20 to £30 for machining. Easy to police with when the head is removed.
3) Maximum static ignition advance in degs before TDC. Cost - free, using modified standard key. Easy to police using current methods of checking.
The rest is down to the skills of your engine builder rather than the hiked up price of the more favourable engine components.
Thats the major areas covered in my opinion Kelvin. I would like to hear your feedback if any of the above would be a viable route to controlling the 'sp' issue.
Regards Andy.
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