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I am also pretty sure I will go down the 438 cam route. My 138,000 mile 172 made 172BHP last year at SRR and if with 438 cams, matched inlets and aircon delete I get around the 190BHP mark I'll be more than happy.
Quick update..
Well the cambelt is due very shortly so plans are.
New cambelt/ belts etc.
438 cams
matched inlets
get rocker cover leak fixed
replace some broken engine bolts
fix horn ( which seems to have stopped working today) :dapprove:
Apart from the above the car is running well now on...