Quote:
Originally Posted by jpsaxo
I'm not 100% sure mate, I know he's done ALOT of modifications to the head that your normal engine builder wouldnt bother with, the small changes make minimal difference, but when you add up all the small differences they = a big difference 
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This JP4 head had screw in gallery plugs already, most of them have and I tend to use them in preference to the ball bearing ones, for the ease of cleaning. There are several details in the engine solely aimed at ease of maintenance and cleanliness as well as cost effective and easy to source consumables etc. I like dialling in stuff like that to make life easier at a later date, comes with a warm, smug, satisfaction!