Hey, I am looking for the proper springs for my engine. Specs on the cam are hydraulic roller, 240 240 @ .050, 292 advertised, .561 lift on both. Other specs are in the sig. I was looking at some comp 987s. But someone said I should use some comp 950s. Ohh, and retrofit roller lifters, if that matters.

1. If you were me, what would you use?

2. Will what you suggest bolt to an AFR 190 head without modification?

3. Can a rev kit be used on retrofit rollers? Can the valve springs be sized smaller with use of the rev kit?

Thanks

 

You need to call comp cams cam help number. They can answer all of your questions and get you the correct springs and you can be sure the answer is correct.

 

When I call comp, one guy says one thing and another a different thing. And comp usually doesnt recommend a rev kit for HR cams.

 

1. I don't know about if I were you; but if I were me, I'd use 1.55" springs if I could. That's enough lift that it's marginal for any 1.45" spring such as a Comp 986 or 987; and with the kinds of reliability problems that people have been reporting with whatever AFR supplies (K-Motion maybe?) I wouldn't run those either.

2. No clue. That would be a good AFR question. If you tell them what you want to run, they can set the heads up correctly for it.

3. Not usually. Hyd roller cams don't turn up the kind of RPMs where those really help; and the top of the lifter needs to be of a specific shape, so that the little button thing that sits on it can fit. I don't know if AFR's will fit any given lifter. Again, AFR makes (or at least sells) them, and can tell you what their product is good for, and what it will fit with. I would under no circumstances reduce the valve springs because I had a rev kit. Assuming that it does in fact raise your RPM operating range like it's supposed to, you'll still need all the valve control you can get.

 

Thank you for the reply.

Why does it matter the diameter of the spring? I am thinking that if the spring has enough open/seat pressure, that the diameter is no relevant? Thanks

I think some people are using a 950 spring which i believe is a 1.46 diameter or something.