You said you already had a shovelhead piston in it , if you haven't got the gear , the compression tester reading will give you an idea of the ratio there are charts on the net , as I said my 170 equates to approx 8.5:1 . Let us know how you get on with the springs etc .
Thanks for the advise, much appreciated. I've a friend who's offered me to delve through a huge stash of springs he has collected over the decades, I might be lucky to find something there, otherwise I could use the terry spring specs as a bench line and have custom springs made to order.
I also have another set of cams which I assumed were standard as there's very little in the way of stamping on them, turns out I was wrong, I measured the lobs and they have an even greater lift 
, it's because of the fixed rocker pivot , so you can't make the valves longer , the easiest is less coils otherwise , if you have a junk head cut it through the center of the valve spring seat , so you know how much meat there is before you go into the port , you could then machine some material from the spring seat . To gain coil clearance , those terrys 345 springs only have about 60lb , well on mine any way, my keepers might be higher as I had drama with the rocker hitting the side of the retainer
Tricky, you could say that! I was tempted to remove some material from the head as you suggested, maybe as a last result! As for measuring I was just going to use a dial gauge for max lift and probe between the coils with a feeler gauge, cutting up the head is for later retribution should it blows upI said the springs were tricky
Thanks, very helpful
Thanks for the help, I'll be sure to post an update when I've made some progress
Hi Catweasle, no it won't unless the rocker ratio it 1:1 , if you have a dial gauge put it on the side of the retainer, set your tappet first , you can easily calculate the rocker ratio from your two measurements .cheersI've been taking some measurements today to cure the valve binding issue.
I wanted a measurement of exhaust valve lift with the goldie cam fitted, but I took the reading at the push rod lifter, it measured 8.28mm of lift, is this a true way of taking the measurement ? does the valve tappet make any difference to that reading? I can't quite get my head around it tbh
www.vintage-motorcycle.com
Thanks, that little bit of information is going to make a big difference
looks like 3/8 BSF ...but have look above ! after more research it could be 3/8 CEI /BSC
BSA Cylinder Head Holding Down Bolt B31/B33/M33 | BRITISH Only Austria Fahrzeughandel GmbH
Also - make sure to use the Telling Bone!Thanks, that little bit of information is going to make a big difference
