I changed them to 7's all round and she runs fine... ish!.. actually the electrodes were completely missing on some of the plugs, possibly due to fuel surge whilst doing donuts and the engine going lean.... did a compression test and #4 is down a tad... so as we had planned on tuning anyway, I'll pull the head, port it and sort it... but thanks for the advice... 7's all round made it run fine... top tip.
Mike.
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