LsF-150

iTrader: (2)

Been reading old threads from '10 and '11 and alot of people were running .060-.090 but the newer threads are saying .030-.050...this is the 5206 link bar versions, i'm to the point of buying pushrods and come up with 7.325 to zero lash. My current 7.400 would put me at .075, is this too much? Whats the current recommendation? Iron block, tfs 235's

hiltsy855

iTrader: (35)

I got my 5206's from Brian Tooley and he recommended 1/2 to 3/4 turn of the rocker bolt to zero lash. Assuming 1/4 of a turn is used up torquing the bolt (not adding preload) that only leaves .020 to .040 preload on the lifter. If it was me I'd use 7.375. Of course I might be a little biased since I have a set of Trickflow 7.375 pushrods for sale ($60) in the Parts Classified here LOL.

Jontall

Trickflow recommends a .100” longer than stock push rod. Morels are 0.050" taller then stock lifters. Math: 0.100-0.050=0.050" preload with 7.4" push rods. That's about exactly where you want to be so run the 7.4" push rods.

hiltsy855

iTrader: (35)

How would Trickflow know what his combination is? Measuring is always the best method for checking pushrod length. Morels are taller but you also have to consider the reduced preload requirement. Vettenuts knows his stuff and in this post he indicates the taller lifter + reduced preload requirement you end up with a .100" shorter pushrod. Answering the OP's question, .075" is more preload than Tooley, Morel, or vettenuts recommend.

badazz81z28

iTrader: (6)

Why not ask Morel?

Jontall

You're not the OP... He has 7.4" push rods in-hand so why not use them. Unless his heads are milled, my calculations are correct. He will have 0.050" preload.

IllusionalTA

iTrader: (9)

How is Anyone measuring this mans pushrods for him ? Have you measured your pushrods? .050 is a decent number.. I'd shoot for .040

LsF-150

iTrader: (2)

I talked to Tooley this morning, I just purchased these from him last week and he told me .075 was fine and .090 would be the max. I'm doing a front mount at the same time, I've got alot of money wrapped up in it, I'm not trying to cheap out on pushrods just figured why buy if I don't need to.

hiltsy855

iTrader: (35)

Wow, that's funny math. He has 7.325 to zero lash and 7.400 pushrod gives him .075 preload. The OP knows this and is not asking what his preload is but what it should be.

IllusionalTA

iTrader: (9)

Well good luck to you sir..

vettenuts

iTrader: (4)

Not sure if the body is the same as the non link bar, but I spoke directly with Morel and was told 0.030" - 0.050" for my lifters. There have been cases where too much preload on the Morels have reportedly held the valves open. I would check with John Callies on this one.

Also, on TFS heads I would also go with a larger OD pushrod and ditch the 5/16" OD.