Quick question. I have the world products s/r torquer heads and am looking to replace the valve springs with comp 986-16 as recommended on the cam card that came with my xe270hr roller. According to summit, these are 1.430 dual springs. The springs on my head are 1.250.

The world products site says these heads are machined for both 1.250 and 1.560 springs. My question is simply will the comp springs work I this head? If not, are there alternatives?

Thanks

 

Yes, but they will need some form of retention.

http://www.summitracing.com/parts/CCA-4712-16/

Probably the right ones but you should check with World to see what the OD of the guides on those heads is. The ID of the locators needs to slip down over the OD of the guides with only a few .001"s of slack. (less than .050" would be ideal, less than .020" would be even better) And of course you'll have to take their thickness intoa ccount when setting up the springs; might need .050" offset keepers to give enough installed height.

 

So, I finally got a response from world products. Here is what they suggested. Can you let me know if you think it would work? Also, would offset locks/retainers still be needed?

The heads are machine with a stepped seat. You can simply install a .060" thick 1.250 shim in the step which will make it a flush seat for the larger spring

 

Problem with that is, there's nothing to keep the 1.4x" spring from dancing around in the pocket. It's good that the pocket can be made flat easily; but there still needs to be something to hold the spring still.

Another option you might want to consider is finding a 1.5x" spring that will give you the right pressures. Shoot for around 140 - 150 on the seat, and around 325 - 350 open. Comp 924 set up at 1.75" installed height might be just about right. Call Comp and tell em what you've got, and ask if that will work, and see what they say.

 

Don't worry about it. I've run duals (and singles) on heads where the pocket is bigger than the spring. They won't move around much on the bottom unless you're looking to turn NASCAR type RPMs. If it's a typical sub-6500 RPM motor you'll be fine and will never have a problem with it.

If you're the nervous type, get a spring cup that fits tightly around the guide and has the proper OD for the 986 springs. OR.... look for a beehive-style spring. They seem to be the hot ticket for roller cams these days because they knock a TON of weight out of the valvetrain and are very stable by virtue of their design.