He actually had had a couple more 4 cylinder engines after the blown one but was always down on power for unknown reasons. He was running the dq500 for quite sometime anyway so this was a logical step I suppose, it'd always been mentioned.
Dave's a pal of mine speak to him quite a lot, unfortunately he just doesn't have the time to post on the forums although I have asked lol.
it is indeed quite some feat for one man in his garage. The wiring I know was a pain, changing connecter blocks etc took along time but it's running real well, last night recorded a 6.6 100-200 time. Bigger things to come soon also 😎