Chris18927

iTrader: (6)

im planning on doing a camp swap here soon (iplan on running the cc306) and i was wondering if i could change the valve springs on the heads while they are still on the car. I really dont want to take the heads off but if i have to then i have to.

Also can use the stock retainers on the valve springs i plan on running? They are CCA-986-16 on summitracing.com or are there valve springs out there that can re-use the stock retainers?

Imnotfast

iTrader: (1)

Yes you van change the springs with the heads on the car.

No 986 springs will not work with the stock retainers or spring shims.
26918 is a spring is a great option.

Captainofiron

iTrader: (1)

yea changing them on the car is easy, they rent the tool at Autozone and you get buy a nicer tool from a "higher end" auto parts store e.g. NAPA, Pepboys, et cetera.

but ditto on the retainers and seats. Its a good idea to change them just in case they are worn, also they arent too much more.

Imnotfast

iTrader: (1)

The crane tool 99473-1 Works the best. Does both intake and exh at the same time. 20 to 30 mintues and your done.

Chris18927

iTrader: (6)

Whats the size of the stock valve springs so i can make sure that the new ones i order will fit on the heads

Captainofiron

iTrader: (1)

I wanna say 1.46 OD, and .7 ID, I am kinda foggy on the ID, and I believe installed height is 1.7, thats on the stock springs of course

Imnotfast

iTrader: (1)

just get 26918's...i am not at the garage.

speed_demon24

iTrader: (6)

Stay clear of the 918's. Patriot sells a cam kit that will work with the 306, the golds will work fine. $255 including springs, seats, seals, locks, and titanium retainers.

Imnotfast

iTrader: (1)

Why stay clear of the 918's?

speed_demon24

iTrader: (6)

http://www.ls1gto.com/forums/showthread.php?t=159887
https://ls1tech.com/forums/generation-iv-internal-engine/717173-what-hell-going-comp-918s.html
https://ls1tech.com/forums/generation-iii-internal-engine/728254-comp-cams-918-spring-broke.html
http://web.camaross.com/forums/showthread.php?t=513691
http://web.camaross.com/forums/showthread.php?t=525349
http://www.ls1gto.com/forums/showthread.php?t=164666

Imnotfast

iTrader: (1)

Thanks Good info.....Thought Comp was long past these problems

alconk

iTrader: (1)

A couple of years ago I used these springs on a LQ9 (6.0) and just right after they were installed I was cruising at about 60 when one let go. Long story short I called Comp and they wanted the pieces back immediately, they paid for the repairs and all was well. So who knows what really was going on??

Captainofiron

iTrader: (1)

its was a few batches of the 918's they are past those problems, I made sure when I bought mine that they were a new batch, when you buy them they have a batch number and from this you can tell which are the faulty ones, Call Comp Cams they will verify this

speed_demon24

iTrader: (6)

Comp hasn't admited there is a problem yet, unless you are talking about them breaking a few years ago. It just started happening again recently. If it was just a few batches the range of batch #'s wouldn't be spread out over 2000+ batches.

Chris18927

iTrader: (6)

I cant really afford the fancy pants 918's. Im doing a budget camp swap so i would like to use standard valve springs. Would the springs i picked out work with my stock heads with no machining or could someone recomend some that are not the 918's

speed_demon24

iTrader: (6)

Putting a cam in that revs to 6800+ and skimping on the valve train is NOT a good idea.

Imnotfast

iTrader: (1)

Well you can get away with .540 lift with the LT4 springs.

Chris18927

iTrader: (6)

I'm not going to be spinning the motor to 6800+ and i realize i wont get the full potiential of the cam. However later on when i port the heads ill put the 918's but for now ill keep it around 6-6200 rpm