im trying to learn as much as I can as i put mine together such as lift and setting the springs.
so my questions(for now) are...
Im using the cc305 cam, which if i remember is at .510/.510 lift correct? but that's with the stock 1.5 rocker arms...what is the lift with the 1.6's that i'm going to use and what kind of math do you do to find that out?

going off that question...when setting the springs, what is a good seat pressure, and where can i find out how you go about determinng it?

sorry about all the questions but i want to learn as much as i can and not just throw this together and screw it up. thanks in advance.

 

One way to do it is take the lift at 1.5 divide that lift by 1.5 and that gives you your lobe lift. Then just multiply the lobe lift by 1.6. Example 510 divided by 1.5=340. So 340 x 1.6 and you get 544.

So you need springs that will support 544 lift. The manufacturer will tell you what open and closed pressures will be at a particular installed height.

You might consider going with a spring that you can use on a future cam if you intend to get one anytime soon. Of course, if you plan on a big cam, you might not want to go with the heavy springs until you get the cam.

 

i dont have the springs infront of me but they are from combination motorsports, i want to say they are their 612 springs but ill double check when i get home. i remember them telling me it should work no problem.

 

Your cc 305 should come with a Cam Card which will give you the recommended spring pressures at a particular installed height (the distance between the bottom of the retainer and the spring seat. E.g. if the recommended spring ht is shorter than that distance, you would install shims under the spring to shorten the distance. The spring information should also give you the coil bind information which is that extra distance between the coils when valves are full open. You need some extra room or the coils would stack up and bind.

 

I ran the cc305 with the ex612's springs(good to .600 lift) without any problems.

The way I was taught to do the math is slightly different, Bubba. You get roughly the same answer though. I was taught....

.510 divided by 1.5 equals .34 then take .34 and multiply it by 1.6 and that gets you .540 lift. Like I said, its almost the same but slightly different.

 

The reason your method is slightly different is because your answer is wrong: .34 x 1.6=.544 not .540. Funny how that works.

 

DOH!!!!! I am what you call an idiot. Im just gonna blame that one on the calculator. Man, Im stupid!