Originally Posted by logan1
Ok from what i have read the 1.6 rockers will only give me 10hp more than the same cam with 1.5's. I also read a few posts that said that they wreak havoc on the valve train; not sure if this is substantiated info or not but at this point im not too inclined to run em.
Also i saw that thread posted by landshark and the problems he is having with 1.65.
10 HP is 10 HP. Not a bad gain for just a rocker ratio increase.
1.60 rockers do not tear up the valve train.
Landshark is having problems for other reasons.
Like the funky pushrods he is using. Not hard to see why the guide plates are getting all carved up, by using those fubar pushrods.
People have valvetrain problems for various reasons
usually incomparable parts or lift interference or improper geometry (pushrod length)
1.6 rockers on a SBC are not a problem, when installed right.
That Crane cam has modest valve lift especially on the intake side.
1.6:1 rockers is a good way to effectively get more net valve lift.
increases the rated valve lift (w/1.5 rocker) by a factor of 1.0666.
EG: .480" x 1.0666 ='s .512" net valve lift
When ever using aftermarket heads you need to pay attention to valvetrain geometry.