hello....well look on cam card and see the lobe lift .....say your lobe lift is .3334(In), .3468(Ex).....with a 1.7 rocker the valve lift will be>>>.567(In), .589(Ex)........with a 1.75 rocker the valve lift will be>>>>.583(In), .607(Ex).....
a good trick here is if you are going to use 1.7 rockers, grind cam lobes bigger for more lift or even use 1.8 rockers....keep talking to the older drag racers and older round track guys... they have lots of tricks on these engines.....seems they did everything that could be done to these years ago-most everything i have learned comes from these guys who did all this-they already experimented - and found out what works and what doesnt.....but its all fun, so have fun
Lee
