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£400!!!!!! wowzer!! The genuine part is £75, an aux belt (has to come off, always replaced as good practice) is about £20, £20 of coolant, roughly 3 hours labour being sensible about it. I can't see it being much over £200. Whoever you went to didn't want to do the job
my personal guestimate for 142atw on a single roller would be about 165atf
you will actually see slightly higher atw figures on a single roller than the same car on a twin roller too
30 is a pretty fair loss figure, a single roller will see this down to mid 20's, and a sadev box can see even better than this. Won't be anything like as like as little as 10bhp.
Peak loss doesn't even occur at peak power necessarily, the power can be dropping off towards the limiter but the...
spec list was massive, but the jist of it was high compression, headwork and cams, fine tollerence balancing and throttle bodies with extra long trumpets.
spent days measuring every single clearance imaginable on the bottom end alone
dont bother with the water pump. make sure he does the full aux kit, not just the belt. Also make sure it gets an oil and filter change at the same time. No point having a nice new dephaser on there with old oil
we supply 438's too. They're worlds apart from 428s. There's a bit more to them than just advancing the exhaust cam, but that's the biggest change from 421's
Very good feedback so far too. Only cams i'd fit on a stock inlet now. Shricks are good, admittedly, but not better by the price...
the one at the top of the spring? thats going to be a big job!. Can be drilled out. Probably goint to have to remove the alternator to drill it from behind. It may be easier to change the bracket