redbird555

iTrader: (14)

Hey guys I just ordered an EPS cam from Geoff the specs are 222/234 on a 115+3 .604/.604, trying to go the sleeper way at least a little lol.

Anyway Colorado speed is running a good sale on their pushrods I am STILL going to measure for the proper length when I do my cam I was just wondering what is the length people usually run on eps cams similar to this as I would order those on sale and try them if they dont work out I'll just exchange them for the right length. I am still running the ls1/6 style lifters fwiw

I have seen that Patrick G and Geoff usually suggest the 7.425 and it works out well just looking for what people actually ended up with or if those worked out ok.

409CISecondGen

iTrader: (2)

inb4 "always measure pushrod length"

I have an EPS cam and both Geoff and Pat said 7.425" would work. Haven't installed it yet, going to measure and overnight the pushrods just to be safe.

redbird555

iTrader: (14)

Oh ya as I said in my original post I'm going to measure I always do. But 7.425 usually works for an eps cam so maybe ill get lucky save a bucks on the sale and have no down time lol

Darkman

iTrader: (2)

When I installed my EPS cam with no other changes in those components that alter push rod length, the 7.425" default assumption (as suggested at the time by PatrickG/G. Skinner) turned out to be acceptable in terms of preload. Your results may vary.

pauls99z28

iTrader: (32)

Just Got my EPS cam in Spec'd by Pat G...He recommended 7.4 I guess due to using BTR SLR lifters and 040.cometics. I will still measure might even need smaller to 7.375 due to lifters preload.

Darkman

iTrader: (2)

There is no mystery surrounding the basis for 7.425" recommendation - it accounts for the change in the base circle of the new cam vs. the stock cam, and nothing else.
https://ls1tech.com/forums/14981732-post23.html

redbird555

iTrader: (14)

Thanks guys the ls7 and btr lifters usually move the lifter cup up a bit so I can see why you would need to go shorter with the cometics. The ls6 in my car has a whopping 17k on it and about 12k on brand new ls6 lifters so it's just gonna be a cam and spring swap. 7.425 sounds like the ticket I may just order those and hope they're ok when I measure.

What preload do people shoot for with stock lifters? I know ls7 like around .080 I've heard stock should be around .065-.070

redbird555

iTrader: (14)

Thanks dark an I realize that's why you need a longer pushrod but I'm not sure of the base circle size of the eps cams so that's why I was just trying to get a poll lol

PREDATOR-Z

Measure...

redbird555

iTrader: (14)

I've said in 3 different posts I am going to measure........ But there's a sale going on so if I get it right by an educated guess it may save me time worse come to worse I just have to exchange them.

One other thing 7.425 is usually quoted for stock ls1 cars. With an ls6 engine the valves are .025 longer than the stock ls1 valves to make up for the slightly smaller base circle of the ls6 cam. Does that completely throw the 7.425 assumption for an ls1 put the window or is it the same idea. Again I am going to measure once everything is in but maybe ill get lucky with this sale and save some time haha

Siciliano15

iTrader: (7)

i am using an eps 226/230 598/600 cam with 243 heads that were lightly milled and lunati link bar lifters and ended up with 7.325" pushrods to get me the correct pre-load. any shorter would have been too short but 7.35 may have worked... just another number to hopefully help you out.

Alvin@PCMofNC

Really it is impossible to predict exact pushrod lenght. As a shop who installs cams on a weekly basis often the same exact cam package in two otherwise identical cars will take different pushrods. Measuring each one is what I attribute most to cars leaving our shop with quiet valve trains.

redbird555

iTrader: (14)

Ya like I said I'm going to measure I already have the tool but I figure I would order something that has been known to work to take advantage of the sale price and if it measures out to be ok great! If not I can just exchange them. In the end I may not have any down time or worse comes to worse I'll be out just as much time as if hadnt ordered any at all.

My thing is the ls6 uses long valves (.023") to make up for the smaller base circle of the ls6 cam. So doesnt that completely throw out the notion of a 7.425 pushrod GENERALLY working on a stock engine beacausese these valves are longer

Darkman

iTrader: (2)

The short answer to your question is yes. The 7.425" does not contemplate the longer LS6 valve. However, the 7.425" also changed (in theory) the factory preload by 0.004". This theoretical exercise is hampered by the fact that the factory preload varies; the range of preloads used for factory lifters (at least in discussions on this forum) varies from 0.030" to 0.100"; and the availablity of most pushrods in 0.025" increments.

Having said all that, 7.425" push rods worked on my first cam change - an LS6 with all stock components - perhaps for all the wrong reasons.

Siciliano15

iTrader: (7)

theres a certain rule i forget what it is but whatever your pushrods are that you have now, once zero lash is reached while on base circle, it should be about ½ to 1 turn until reaching the required torque if you are using link bar lifters. with ls7 lifters its a little more preload i think around 1½ or so. If it ends up being 3 turns you should get the next size shorter pushrods. If its 5 turns youd want about 2 sizes shorter. I dont know if thats exact but if you search around, theres a rule of thumb to follow. It worked for me so basically you dont NEED to get a pushrod checking tool if you use this method.

redbird555

iTrader: (14)

Thanks guys I'll speak with geoff and see what he says. I've also been looking at springs and I'm kind of stuck between the PAC 1211X and the PSI 1511 spring. Both spec out at the same pressures but the pac is about 60 bucks cheaper. Anyone used the 1211x? The psi's have a 0% failure which is nice to hear though lol

JakeFusion

iTrader: (7)

I know you can run beehives, but I think Duals are the way to go. EPS lobes are endurance profiles and are nice, but they are still aggressive. BTR Platinums...

Siciliano15

iTrader: (7)

lol thanks. it was actually AMS13 that thought of it so I cant take full credit for it but yea that's our "club"

vettenuts

iTrader: (4)

Not sure if you bought pushrods yet, but if not contact Colorado Speed and ask them if you pay for them, can they hold off shipping until you verify the length. I am sure they will work with you, most vendors will. That way you can get the sale price and ensure the correct length.

I like the PSI springs, however based on my experience, they set up on stock heads at 1.765" installed height with the retainers that I had. Better run some numbers to make sure you can handle the lift on your new cam.

thunderstruck507

iTrader: (18)

I've done 2 EPS cams. One needed 7.4 and one needed 7.35