Ls4GXP

Okey hows does the Ls6 beehive valve springs benifit in our Ls4s over the Ls1s........I mean is it worth the time and money.......do you get more ***** out of this mod.

Firebirdfan

LS6 springs are stiffer and can hold up to a higher lift cam/rockers than the LS1s.

Ls4GXP

alright I got it, thanks for the info.

06 SS

as a general rule, stiffer springs will go higher in the RPM band before they start to float. From every stock-spring LS4 dyno plot I have seen, the stock ones start to lose it around 5200 RPM. I believe you would gain an appreciable amount (perhaps 5-10 horses) and a measurable difference in the quarter by simply swapping the springs to a better set and tweaking the program to hold second gear longer

Firebirdfan

You're welcome.

Swapping the springs onto a stock engine more than likely won't show any gains as the tune, rocker ratios, and cam are still all the same.

However, if you plan on running higher ratio rockers or (if you can afford it) a cam, then the LS6 springs are gonna be a very good option. You'll be able spin the valvetrain to a higher RPM and (if the cam grind allows it) make more power.

I don't think there is any cam option for LS4s at this time, there are, however, higher ratio rockers available. If you get them, then keep the LS6 springs in mind.

Nacho SS

iTrader: (4)

Mixerda threw an LS6 cam in his IIRC.

EmersonHart13

iTrader: (3)

I am not sold on the cam, no one can seem to back it up with numbers... Or did I miss that post?

Ls4GXP

So what are you Ls4 guys doing... springs only, springs and rockers, or springs, rockers and 3/8 pushrods...what do you guys recommend?

Sittingmongoose

iTrader: (1)

most people just do the springs, rockers, and pushrods. From what i have read most people gain around 10 hp from doing those things. Its next on my list if i dont get rid of my car. Cams are available but they seem to not really be worth it in our cars cause like emerson said not really any numbers to show gains. Way to risky for such a complicated job and expensive to boot.

StealthV8

iTrader: (1)

The only cams i've seen used were just stock cams from other ls engines, there are some companies saying they are making a performance cam for the ls4 but i have yet to see it. Plus everyone seems to want to keep DOD for some reason

Mels SS

iTrader: (1)

Is there a set of rockers rods and springs a company makes and if there was a cam with the set you would be set LOL and I'm getting rid of DOD ASAP!!!

LS4SPEED

iTrader: (3)

OK people this is what Ive seen and read so far. The LS6 cam will work, but takes away from the low end grunt, (which is okay for us anyway, but no, dyno proof, from the Wisc. guy, but (Mixerda) did the same cam? At least I think?) and again no dyno proof! HUM, Well lets see what we get from a real dyno.... the only thing Ive seen proof of is about 14 H.P. that's rockers springs and push rods! Am I right, or did I miscalculate? Please let me know, cause If its more than 25 H.P. and T.Q. I'm in it!! I will not spray, or force air this car..... The fact that the trans won't hold the n.a. power is enough for me to just mod existing components, or maybe just add the real power ratio.

Nacho SS

iTrader: (4)

Springs, Rockers, and pushrods are good for about 10-15HP. Adding a cam and those mods with complement each other for a total gain of about 30-45HP (high estimate) with an aggressive tune. Spraying on top of that would be a nasty little package.

Mels SS

iTrader: (1)

Is there a complete set? If so whats the # and Manufacture.

Nacho SS

iTrader: (4)

No complete set but look up:

Harland Sharps 1.8 Ratio Roller Rockers
Comp 918 springs or LS6 beehives
Comp pushrods (forget the P/N)

Ls4GXP

I just found that www.slponline.com has those performance kits springs,rocker arms, 3/8 pushrods and all the necesary components that go with that........but its $$pricey$$

Mels SS

iTrader: (1)

Its ashame GM doesnt have thoese parts for us with the Warranty

EmersonHart13

iTrader: (3)

What about the Scorpion Rockers that Summit sells?

Nacho SS

iTrader: (4)

I've seen them used in one LSx build before but I can't remember for the life of me if they owner actually liked them or if they turned out to be durable.

StealthV8

iTrader: (1)

hopefully gxpjay and cartunning do the engine build, i think he said they were doing cams, heads, etc and getting rid of dod.