Slow89Iroc-Z

I am going to be installing the CompCams CC 306 cam with 1.6rr it specs out as follows:
230/244 duration at .500
.510/.540 lift with 1.5rr
.544/.576 lift with 1.6rr
112 lsa

Comp recomends their 987 spring with this cam. It specs as follows:
121@1.8 install height
388@1.2 open load
344 lbs/in
max valve lift => 1.8-1.15-.06= .590

I currently have these Trickflow springs:
120 lbs. @ 1.780" installed height
300 lbs. @ 1.280" open
360 lbs. per inch rate
.540" maximum valve lift

But I am concerned about valve float with the recomended Comp 987's so I want a spring with a higher seat pressure. It seems the comp spring is less of a spring than the one I am running now. But it will alow more lift with the comp spring. I want a spring around these specs:
130 lbs. @ 1.80" installed height
400 lbs. per inch rate
.600" maximum valve lift

Anyone see any problems with this spring..anyone have any recomendations?

Vader

Whic spring? The last one you described? As long as the studs can handle it, and the rockers are up to the task, there should be no problems using those springs with a roller cam.

One thing to observe is that it's a fairly high rate spring, and may generate a lot of heat through normal operation. You also need to consider the total coil length and possible harmonics if it is a single spring installation.

Slow89Iroc-Z

The last spring I described is a set of specs for a spring that I am looking for. I want to know if something with those specs will be good with that hydraulic roller cam and if anyone knows of a spring with close to those specs.

anesthes

iTrader: (12)

I'm in the same boat. almost afraid to fire up my engine.

Same trickflow springs you have. Custom cam.

.533/.540 230/245 @ .050, 114lsa, 112ica.

Trickflow says "Fine!" Comp says "maybe" "yes" "No" (the 3 guys I talked to).

-- Joe

Mkos1980

iTrader: (8)

i had roughly same lift and the same TF springs and I got alot of valve float from 5000 to 5500. I was at about .536 on the max .540 You could really hear it and also the car dropped off power and maf readings decreased with it was happening. Made the motor sound like it was free wheelin. since I have the 219 cam with 560 lift i went with TF .600 springs and so far so good with my heads

Slow89Iroc-Z

SO anyone have any ideas? Or who is running this cam and what springs are you using and where are you experiencing valve float??

Slow89Iroc-Z

TTT

Mkos1980

iTrader: (8)

For one I would not use your current ones. I would upgrade to the TF 1.46 Duel Spring. All your stuff on the 1.47 single spring will fit over perfectly as in retainers and stuff.

Slow89Iroc-Z

I am afraid to use TF spring..I hear that they are an off brand and have a tendency to fail!!

Mkos1980

iTrader: (8)

The old ones used to be made by K Motion and used to crack. From what I hear its a new company now. I have put over 15K miles on my springs from Track times to the Power Tours 4K mile highway trip and they have performed perfectly.

pasky

I went with comp cams 612's. Im also running 1.6 roller rockers. They are good to .590 lift I believe, could be wrong. With 1.6's im at .57* lift on the exhaust. I don't think there is any need to run a stiffer spring and it certainly won't help to go stiffer. Just stating what I got with my 306.

BTW, you'll love the 306.

Slow89Iroc-Z

I didnt see a 612 spring listed on Comp's site...

Slow89Iroc-Z

Well I just bought the TF level 3 springs...hopefully it was the right move???

Valve Springs, Option 3:
1.460" o.d. double with damper
125 lbs. @ 1.780" installed height
376 lbs. @ 1.180" open
420 lbs. per inch rate
.600" maximum valve lift

pasky

What rocker ratio are you going to be running? You don't want too stiff of a spring otherwise you will overstress your valve train and it will wear more than it should.

Slow89Iroc-Z

1.6 ratio full roller rockers. I dont think the Trickflow springs are too harsh?

pasky

Their not, .600 is good. Thing is, people run those with gm847s which is a much bigger cam than the 306. Believe the 847 is 540/540 lift and about .596 lift with 1.6's. You'll be fine with those. I thought for a moment you were gonna run 1.5's. Lots of people run the 612's with the 306. That doesn't mean everyone has to. Its what i have and I have spun this bad boy to 6600 rpm and it keeps pulling, so im not getting valve float.

Slow89Iroc-Z

I think the lift on the CC-306 cam comes to .544/.576 lift with 1.6rr. Pasky did you manage to find that permatex for the head bolt I recomended in your thread? Or did you use something else?

pasky

Nope, I found it. Didn't come with a brush however, I do have rubber surgical gloves (without the powder) I can use, I used these when installing my main and rod bearings to make sure their clean. Can I gob enough on with my fingers?

Slow89Iroc-Z

Yea shouldnt be a problem....just get it in all the threads on the bolt like RB83L69 said...just use it very liberally...but dont make a mess out of it so it gets in the coolant and clogs up the passages in the block

pasky

Oh forgot to mention, make sure those springs you bought will fit the stock head valve seats, otherwise you may need them machined to fit.

Mkos1980

iTrader: (8)

Good Move. I've taken my motor up to 6500 with .560 cam and no problems with the Level 3's

pasky

One other thing, if you bought the cc306 cam and didn't tell them about dowel pin length, you may have a very long dowel pin. The reason behind this is, the cam actually drives the distributors on the LT1's. When you recieve your new cc306, do not throw your old cam away when you take it out. Put them both side by side and compare the dowel pins. If the 306 is too long (they didnt push it in knowing yours was going in a regular SBC), simply push it back into the cam gently until it matches the size of your old one, or, if you havn't ordered it, tell them the exact length of the dowel pin you will need. Im sure you can find the specs somewhere here for a sbc cam.

Slow89Iroc-Z

My old springs are 1.47 OD. These are 1.46 OD so they should fit. Would I have to order the cam directly from comp to do that no? I was just gonna get it from Summit....hmmm Guess Ill have to ask the Summit tech line guy when I order.

pasky

Yup, summit should be able to take care of you, just specify the dowel length you need. If not, its not hard to do yourself. Now I may be wrong, but it may not be necessary, for us lt1 guys, if its too long, it will tear our opti apart, too short and it will not drive the opti. More information:

http://shbox.com/ci/ci289.jpg

Notice how the cc306 is longer?

Our dowel pin lengths mut be .620 of an inch. That Comp cams cam was acually .840, it needed to be shortened. So just compared and push yours back in. Not sure on the size needed for SBC's.

http://web.camaross.com/forums/showt...ight=dowel+pin

I thought you pushed them in, it may seem that you might to grind. Just a heads up.