Thread: Rockers with cam????

1.6/0.516" = 1.9/X

Solve for X

X = 0.613"

Don't quote me on this. LOL

For the sake of my next statement, consider an XP cam an intense 1.5 cam (Inbetween stages 1 and 2)

I'm not positive on how well 1.9s will work, however, I do know that people have run 1.7s on XP cam'd setups. I think 1.9s can be done with a good tune.

Originally Posted by Explicit_Spade

For the sake of my next statement, consider an XP cam an intense 1.5 cam (Inbetween stages 1 and 2)

I'm not positive on how well 1.9s will work, however, I do know that people have run 1.7s on XP cam'd setups. I think 1.9s can be done with a good tune.

I wonder if the springs can handle that.

The XP cam alone requires larger valve springs, so adding 1.7s I would suggest the following:

Stock springs, no.
LS7 Maybe.
105#s Yes.
130#s definately.

I could be wrong on this though.

Lift calculations are easy.

Lobe lift * rocker ratio = total lift

S1 = .614"/.608"
S2 = .629"./608"

Most vendor heads were originally clearanced for .600", Have your heads checked and then you can consider the geometry etc of will .629" be too might for the rest of the components. Ensure your springs won't bind, ensure the spring seats on the heads have been machined to be 1.800" install height vs our stocker height of about 1.78X" with modded retainers.

Another possibility is to sell or swap your 1.9's with someone that has a slightly lower ratio. I did this when I had some 1.9's and wanted 1.8's to go on top of an S1X blower cam.