Originally Posted by F-BIRD'88
More radical hot street/strip to race:
Usually if going with .550" lift or more I go for the +.100" valves as the larger diameter dual valve springs used, want this. 1.80" +/- ish installed height.
Most street perf hyd flat tappets and moderate street-strip solids:
If you will be using stock diameter hi perf springs 1.25" +/- and modest .530" or less valve lift (typical 1.70 to 1.75" installed height) a standard stock length valve gets it done.
What cam is being used? what max rpm?
well matey dropped heads offto me today, so will post more pics later on. having had a chat about what he's doing with them it looks like ive possibly struck a deal with him for them, so ....
the cam in my motor is a sum-1102 , but having talked over options in another thread I may look at the 1103 or 1788 cam for my build if I fit these.
max rpm 5- 5.5k
while im thinking about it as anyone used the sum-1788 cam?