Hi,
just an update
we had this out again last weekend with diffrent converter as the old man has been talking with a few people with blown flat tops here in aus and in usa and they agreed somthing was wrong as we ran it up to 19psi boost and ran 126mph (and with the 1930 model drum brakes he nearly ended up off end of strip brakes were visualy smoking when he eventually stopped HeHe)
cut a long story short we have had a fair amount of trouble keeping head gaskets in so when on the 126mph pass it hossed water out of zorst pipe we all cam to the conclusion that it was the head gaskets again as we are now running solid copper head gaskets with out orings but they have 24 studs on each side so aparently we dont need them. but when head was lifted off it had actually cracked the aluminum head on the edge of chamber.
so one question that cam up while talking to the blokes in the usa and here was timing well we hadnt given that much thought as it has run usally 15psi boost so with the boost retard box how we have had it set up all the time it was pulling all the timming out and only leaving it with a total 3deg advance and with 19psi it would pull it back to 6deg retarded so there is our other problem of the engine getting verry hot and this was never picked up as we have all been way to busy trying to keep the head gaskets in and other stuff on it hehehe.
with this fixed the other people recon it should run 140mph

? oh fogot to add they recon timing sould be around 15-17deg total no need to use the retard box as the type of engine dosent need it and we are now going to try a set of cast iron truck heads as they will bring comp down from 9.7 to1 to 8 to1 and they said they will need 1 deg more timing because of where the spark plug is located so iwill be painting the heads today ready for next w/end big drag meet.
Thanks Hayden