I was thinking of using the 1.7 rockers with a CC305 and when emissions rolls around throw back in the stockers or 1.6's which I all ready have. Would this set up be bigger than the CC306? What do you guys think of this. I plan on installing the CC305 in a forged 383 with aftermarket stage II heads. Would this pose any problems?

 

define "bigger." you'll get more lift, otherwise the other numbers stay the same.

 

Well I am not sure but wouldn't it make it seem like it is a bigger cam? If so would it make it too big for a street car?

 

Not to steal the thread but does anyone know what the lift would be on the hotcam with the 1.7 RR. I already have 1.6s but it seems like a very easy mod for a good hp increase. Thanks

Aaron

 

You'll get more lift, but your duration and LSA won't change. The CC305 has a 114* LSA, the CC306 has a 112* LSA (stock in the '95 is 116* just for reference).

lower LSA = more peaky, top end power
higher LSA = broader power, better emissions

 

Hotcam lift would be .5578 or .558 w/ the 1.7's. I don't think hotcam spring will handle that amount of lift.

Jeff D.

 

Just put the 1.7s on the exhausts.

 

Well I did get the CC305 on 112 LSA. Does anyone know what the lift of the CC05 would be with 1.7's? I have springs that are good up to .600. Thanks

 

not exactly, your duration will be increased by 1-3 degrees, usually 1 or 2.

I doubt that the cam would be to big for a street car.

EDIT: I know 1.6s increase lift by ~ .030, so maybe 1.7s are +.060?

 

both sides are .510".....with 1.5 rockers.....with 1.6 the lift would be 544. with 1.7's, the lift would be 578

 

Doesn't that start to **** up the valvetrain geometry when you use very steep rockers?

 

Just curious. How much HP would i get with a stock H/C with new springs and the 1.7rr's?

 

About 14 RWHP with hotcam w/1.7RR
Linky: http://www.kyfbodies.org/vb/showthre...light=scorpion

 

I would say you would gain somewhere around 13-20rwhp from going from 1.5 to 1.7 on stock heads and cam. Because that guy got 14 more from going to 1.7 from 1.6rr's.

 

for the enlightenment of all people in this thread who can't calculate lift for diff rocker ratios.

new lift = (old lift / old rocker ratio) * new rocker ratio

EX. (using hot cam figures)

new lift = (.525 / 1.6) * 1.7

new lift ~ .557"

or if you know the lobe lift on the cam just take that times the rocker ratio and you have valve lift. just a few little pieces of auto math, good things to know