Ok, i have been disscussing camshafts with some of you for the past month or so. My car has since blown a head gasket . but the good news is that my mom told me to take my time and redo everything while i was in the motor. I am going to have my heads cleaned up and rebuilt with everything, rr's springs, valves, etc....

I would also like to put in a camshaft. I have decided on the cc305 but have a couple questions. I am going to get in ground on a 112 lsa for sound purposes. based on the article about rr's that i started previously, i learned that 1.5's are less stress on the valvetrain than 1.6's. so should i also get the cam ground with the lift numbers that you would get out of 1.6's so that i could still run 1.5's and then if i wanted more lift later on i could always run 1.6's then? i hope this makes sense to you guys. thanks and have a good day all!!

thomas

 

If you run the lift of a cc305 with the 1.5rrs then move up to 1.6s you might have to worry about piston to valve clearance problems. I think that would make the cam have over .600 lift. (not sure about equasion for that one.)

Also having an auto you must worry about vacume with the 112lsa.

P.S.- Check your PMs

 

Someone correct me if I am wrong, but the cc305 has .510 lift intake and exhaust. With 1.6 rockers, this would be .544...


Edit - I did not read the post carefully. If you had a custom grind with .544 lift with 1.5 rockers and switched to 1.6 rockers, the lift would be .580.

 

mag- 3109- 276adv- 220@.050- 138@.200- .510w/1.5 -.544w/1.6
mag -3112- 290adv- 230@.050- 143@.200- .510w/1.5 -.544w/1.6

The CC305 lobes are both .340" You would need .363" lobes to get the .544" lift with 1.5 rockers. That would give .581" lift with 1.6 rockers. I know this will work fine with the stock bottom end.

Personally, I would go with different lobes if you are going custom anyway. In fact, I'm looking at these from Comp for my stock Impala heads:
XE - 3313- 270--218-139-.330-.495-.528
XE - 3315- 282- 230-151-.340-.510-.544

If I had screw in rocker studs like you do, I would go with one of the bigger exhaust lobes.

 

adioss,

tell me more about the bigger exhaust lobes?? i am not that knowledgeable when it comes to that portion of camshafts. so should imy new specs for my custom cc305 would be
w/1.5 w/1.6
220/230 .544/.544 .581/.581 at a 112lsa

correct??

thanks guys

thomas

 

I doubt you can find springs that could work with those STEEP lobes without collapsing the hydraulic lifter. You WILL need a rev-kit and probably longer than stock valves and pushrods.

 

can you explain in more detail? how much longer pushrods and valves. What if i ran the crane spring that is rated to .600", would i still need a rev kit?? Would i need special lifters?? please give me more detail.

thanks

thomas