well i had these on my T/A with a 224/224 cam and they worked PERFECTLY. never had a lick of trouble. im looking at a cam such as 230/236, on a lower LSA, and am wondering if anyones got these and how theyre doing. Bret Bauer recomended me going with a whole setup from him with some better springs, which ill prolly do.... but i just wanted to see if anyone has some insight as to the limits of these things.

 

Other than the shims suck the 99893 springs are probably all you would ever
need for any HR setup. They are about 150# at 1.80" and 391#/in rate which
should be plenty of pressure for the CC 306 or GM 847. They also coil bind at
1.08" which provides for lifts up to .650" if you install at 1.80" or taller.

Just use a good spring seat instead of the shims and they will work fine. My guess
is the reason for the shims is so Crane could get a 1.85" installed height out of
this spring on a stock LT1 head. A decent spring seat will be .060" thick which
will put you in the 1.80" installed height range.

 

yep, get a locator like the Comp 4771-16 and get rid of the cheap little .015 hardedned shims that Crane uses. These shims have a larger hole that do not fit the guide tightly and do not have a step lo locate the inner spring like the locators do.

The spring can handle alot and the only hold back is that HEAVY retainer thay use. They are fine to 6500 RPM and a GM 847 cam but less valve train weight is always better even if you do not HAVE TO have it lighter.

There are other retainers that are lighter if needed. You can just buy the Crane 99893 spring (spring part # from the Crane 10308-1 kit) and buy different retainers and locks.

If you plan on using THESE springs, let Bret know so he can get some lobes that will work with this spring/retainer set up. All of that extra wt from the big dbl spring and big retainer will require a lil milder ramp speed to remain stable at high RPM.

 

ya i mentioned using the kit and he said he COULD deal with it, however if i didnt already buy it, i should just go with the whole package from him, and looking at the price difference, his setup might be the better way to go. was just curious about the springs though, i know when i researched the kit to put on my T/A with the 224/224, everyone was weary about the shims and they did look cheap, but never had a problem.