redbird555

iTrader: (14)

Hi guys I've recently gotten these heads and I have a couple questions... The springs appear to be aftermarket along with the retainers. I know it's a long shot but is there anyway to know what springs these are without having them pressure tested? Also the heads have these guide plates and I'm no using them they are crane btw. All of the ones I've seen hav nuts on them so a wrench canbe used to remove then obviously here there is no nut does anyone know how to remove them? Thanks

mark21742

Can you post some pics?

vettenuts

iTrader: (4)

My guess would be Crane guide plates. You can try to remove using double nuts, it that doesn't work a Snap-on stud remover will get them out without damage but that is expensive. They are worth some money so try not to damage them.

As for the springs, based on the Crane parts, I would think they are either Crane 832's or Crane 833's. If they are the 832's I would personally not run them.

redbird555

iTrader: (14)

Well here are some pics guys the two nut method is what I'm going to try and that is even what crane recommended when I called ahah.. I'm still not sure what the springs are they are duals but I'm not sure if they are crane, comp, prc or what is there any definite way to tell without being load tested? One other question is that these heads are going on a stock ls6 shortblock will the springs be ok to use with that cam or are they going to put too much stress on it. Its currently using stock pushrods but they will be changed out soon will all that be ok with these springs for a while?

Paul 75 L82

iTrader: (1)

Why would you want to take the guide plates out?

vettenuts

iTrader: (4)

Looks like all Crane hardware to me but the springs are just an educated guess. Do you have the rockers and pushrods or only the guideplates and studs?

redbird555

iTrader: (14)

The guide plates arent mine theyre the sellers I just need to remove them safely and he's keeping them. The springs and retainers like I said I'm not sure of they look to have a yellow stripe but idk if that means anything. The retainers from crane look different than these but im not sure. here are the cranes
http://www.summitracing.com/parts/CR...4-16/?rtype=10
http://www.summitracing.com/parts/CRN-144832-16/

vettenuts

iTrader: (4)

The retainers in the Summit link are steel, yours are titanium which came with the installation kit.

redbird555

iTrader: (14)

Thanks guys ya I really have no idea what springs these are I'lll probably take them to the machine shop and have them tested and see what they come out at. Vettenuts, I've researched a lot on these springs and cant seem to find any other bad info than what you posted is it possible you got a bad batch? Oh and also I know they updated the 832 spring and there also is an 833 spring is there any way to differentiate the two? I'm going to just be running the stock ls6 cam with these heads will the springs be ok or are they too harsh for the ls6 cam and valvetrain? stock rev limit off 6600 also

5.3LJimmy

iTrader: (10)

If you were planning on running an aftermarket cam I would be more concerned about spring seat and open pressure, but with the LS6 cam you should be fine. For piece of mind you could measure installed height and verify the coil bind height of the spring though I doubt they would not have room for .550 lift.

trans_am7935

iTrader: (15)

usually, typical duel springs start at a max of .650 lift, so you should be fine. looking at the pic, there is alot of debree in those heads, looks like dirt or something, what is that?

redbird555

iTrader: (14)

Oh ya I have no doubt if I was running a high lift cam I would wanna replace them but like you said its only an ls6 cam. The question I was really asking though is there such a thing as too much spring pressure for a cam in other words will the pressure of these dual springs hurt the ls6 cam or stock pushrods? Also from the best I can gather as of now these springs are probably crane 832's and vette nuts said he had some issues with his on the dyno around 6k rpms causing some fluctuations in power on the graph. However I cant seem to find anyone else with that issue everyone else seems to like them any one else have some feedback on the crane 832's?

vettenuts

iTrader: (4)

If they are 832's, just be prepared for a power dip at 6,000 RPM.

5.3LJimmy

iTrader: (10)

It won't be too much spring for the cam but I would replace the pushrods with any spring. Even the stock LS6 springs for that matter.

redbird555

iTrader: (14)

Not doubting you at all but do you have any of the graphs i'd be curious to see. Like I said are you sure it perhaps wasnt a bad batch I havent really heard of an issue with those spings.

crainholio

iTrader: (2)

Great timing for this question, I'm troubleshooting a suspected valve float issue on mine. Crane '832 springs installed in 2004, pressure tested before installation. Cam is a TR224 112LSA. It's been on at least 9 HPDE road course events running 30+ minutes per session, 4+ sessions per event, WOT nearly the whole time except for shifting and cornering. Plus approximately 20-25K street miles. Plus 3 hard autocross events last Fall, bouncing off the 6400rpm rev limiter occasionally.

It developed a valvetrain tap after the last auto-x, stethoscope pointed me to #8 cylinder under the valve cover.

Upon teardown, I saw minor abrasion around the outer radius of #1 and 8 intake valve tip surfaces. Nothing major but required investigation. No marks on the rocker at all. The valve tip surfaces polished up with lapping compound and a pencil eraser, no flaking of the hardened surface was found.

I took #1 valvesprings to a machine shop at lunch today and had them rate checked at installed height (1.800") and max lift (1.237") results are below:

Today's measurements:

1.800"; 1.237"
#1 intake: 108# ; 310#
#1 exhaust: 102# ; 302#

Original measurements from 2004, same compressed heights:

#1 int: 117# ; 322#
#1 exh: 120# ; 330#

The machinist commented that the springs showed signs of rotation usually indicative of valve float...this combined w/ the valve tip abrasion says it time for new springs.

The Crane springs held up magnificently to all the abuse listed above, did not break, and got me home with only minor repairs required. They lost quite a bit of their pressure over the years and it's time to retire them. Job well done.