dubrado

iTrader: (20)

I did some pushrod measuring and came out with 7.280" pushrod needed (this includes my 0.030 preload for my morel/lunati lifters).

However trend only makes them my 0.025 increments so I can order a 7.275 pushrod which only gives me 0.025 preload on my lifters.

As long as my stock rockers wipe fine, can I just order 0.005" shims for my rocker arm pedestal to so I get the correct preload assuming my wipe pattern is good? Because this would get me my 0.30 preload i want.


thanks in advance

ckpitt55

iTrader: (4)

Yes...

but that's a bandaid fix. I'd call them and see if they'd make you custom length pushrod before I'd throw shim in there

mark21742

What oil pump are you running? I run a high volume high pressure melling and got mine running the best at .020"

dubrado

iTrader: (20)

Same pump actually, iron block + aluminum heads

mark21742

408 iron block here and was spinning it to 8,000 rpms no problem with ls7 lifters til I killed my tranny lol then pulled the car off the road to rebuild the car, not the motor

dubrado

iTrader: (20)

if you found 0.020 ok, then me at 0.025 should be alright, i'm not spinning this thing that high lol. will still have to order from trend since most places won't do anything past 0.050 precision

outkast6991

iTrader: (34)

What's the lift on your cam? In order to get my wipe pattern from the exhaust side of the valve I had to lower the rocker (mill). My lift is .650

LS1MCSS

iTrader: (18)

You're already looking at getting a pushrod that's .005 shorter than you need. Raising the rocker .005 will make the pushrods .010 shorter than you need. Just get the 7.275's and go with it.

dubrado

iTrader: (20)

I'm probably just gonna order the 7.275s if mark has run a similar setup with good results

dubrado

iTrader: (20)

Mine only goes up to .622 lift

outkast6991

iTrader: (34)

over .600 is probably going to be exhaust biased as far as the wipe. Milling the stands will bring it back towards center but you would need to establish the wipe pattern before ordering pr's

vettenuts

iTrader: (4)

Exactly. Shimming the rockers is likely exactly opposite of what needs to be done here. Check the wipe first and go from there. What does the current wipe pattern look like?

Also, I ran my Morels at 0.030" and now run them at 0.050" where they are much quieter.

hiltsy855

iTrader: (35)

Shimming .005" at the pivot means .005" x 1.7 = .0085" at the pushrod due to rocker ratio. But as was said your 7.275" pushrods are too short anyway so shimming is the wrong direction with those PRs. A 7.300" PR w/ .010" shim would be the same as a 7.283" PR but again the wipe may not be correct.

vettenuts

iTrader: (4)

Shimming 0.005 at the pivot means 0.005" X(2.7/1.7) = 0.008 at the pushrod.

JakeFusion

iTrader: (7)

I'd run 7.3 and call it a day. Erik@HKE says .050" is where you want the Morels.

vettenuts

iTrader: (4)

Yes, I found the same thing after running 0.030" in my prior setup.

hiltsy855

iTrader: (35)

My bad . I know better than to simplify in one of your threads LOL.

dubrado

iTrader: (20)

doesn't the block (iron/aluminum) make a difference too? that's what I was told when I got these a few years ago.

I haven't touched this motor in a while and haven't kept up to date on tech in the past few years so things change, so just checking

JakeFusion

iTrader: (7)

What Morels are you running? The 5290s or 5206?

hiltsy855

iTrader: (35)

Is there a difference in pre-load requirement between 5290 & 5206? I have 5206 and Tooley recommended .025-.050" pre-load.