Purple94Z28

Okay so im curious to why even tho both these rockers are identicle one costs more? The more expensive one says something about a Clamshell package? Any help is greatly appreciated...

http://www.summitracing.com/parts/PRO-66915/

http://www.summitracing.com/parts/PRO-66915C/

Thanks,
Nick

joelster

The clamshell ones will probably weigh a teensy bit less due to their design. They have a different shape to them. Whether or not you will feel a difference though is debateable. I would get the cheaper ones. I didn't see if it said whether or not they were self-aligning or non-SA.

ADM

Pay a little bit more and get these http://www.summitracing.com/parts/CCA-1318-16/

Or go with Crane Golds

SpeedDensityZ

iTrader: (5)

Agreed!!! They are an awesome rocker.

BlackBird87

iTrader: (6)

I have the cheaper ones, they came in a shitty clamshell package that fell apart but the rockers work fine so far, i have a mild cam and good springs

mean_greenZ

iTrader: (1)

i got that same set of proforms when i did my cam swap upon recommendation of a reputable sponsor on here. and granted he has his reasons for it but i wouldn't recommend them. I had them on my car for a short time and the anodizing was already starting to come off and they just looked really cheaply made. the polylocks didn't feel right when i set them.

I ended up with the comp magnum 1418-16. while they are not a full roller they still do the job and are silent!! they are the same price as the proforms and are much better quality.

97Z28SS

iTrader: (5)

What about the Scorpion rockers?

gregrob

iTrader: (8)

Or pay a little bit more and get these: http://www.summitracing.com/parts/CCA-1605-16/

ADM

Yea those are better and lighter. But 7/16" studs which means he will have to also buy new studs.

Scorpions are also popular, lots of people on here run Scorpions and are happy with them. They are priced close to the Proforms too and are within your budget. Harland Sharp also makes some rockers within your budget but I believe they are NSA which means you will also need guide plates.

I wish some of the guys who have been camming their cars for decades would chip in with some of their experience.

joelster

I ran Proforms when I ran my Comp 503 cam. It performed very well. I had the self-aligning ones and also ran 918 beehives. Not a problem ever.

spilner

iTrader: (6)

Ive done some research and I am going with scorpion 1003. The 1.6-7/16 setup. Seems like the best bang for the buck and its not some cheap junk.

Gojira94

iTrader: (4)

Have them in my build. Damned fine. Expensive, but damned fine. The Scorpions are still a good rocker. Should work out well for you.

Purple94Z28

Im just gonna get the scorpion 1.6 3/8 SA and be done with it...even thou i have guide plates...just no extra money to have the heads clearanced for them

What are the benefits of having NSA over SA??

JAKEJR

At higher RPMS, self-aligning rockers can lose control of the valve, jump off the valve stem tip, allow the rocker arm to ride on the retainer and result in a dropped valve, etc.

Guys on other Forums (maybe this one too) have posted about their failures and even include photos of the carnage. CompCams doesn't identify a specific RPM above which NSA rockers should always be used but Comp does say they're not recommended for use in any performance application.

NSAs give more reliable valve control. I'm running Scorpions on my engine and my son's as well. I went NSA, 7/16", 1.7s and my son's are 1.7/1.65s. They're priced right, quiet running high quality pieces. $222 at FlatLander Racing.

Jake

My son, Ryan M. Cameron, graduated from West Point on 22 May 2010! He was commissioned as a 2nd Lieutenant and I pinned on his first pair of "Butter Bars" PROUDEST DAY OF MY LIFE!!

defaultexistence

iTrader: (11)

are springs needed also when doing 1.6 rr swap? and some tuning? and not the case with 1.5's?.......

mean_greenZ

iTrader: (1)

YES!! if you are just gonna swap to 1.6rr you can get by with running the LT4 valve springs. Last i heard you could get a set of those springs for ~$40.

There really isn't a point to swap to 1.5rr's your not gaining any lift just slightly less friction.