TARZAN

iTrader: (12)

I've got a set of ETP 225's on my 346, and I checked the pushrod length awhile back, so they *should* be right.....But I was wanting to check and see what lengths you other thick deck head guys are running.


The ones I have are some chrome moly, from TSP, 8.150's if I remember correctly.

thanks,

-Will

vettenuts

iTrader: (4)

With that length pushrod, I would seriously consider a larger diameter like 3/8". IF the 3/8" won't fit, then 11/32" OD would be my next choice. The stiffness is a function of length and those are getting very long. Couple with stiff springs you may have a resonance in the system that kills power.

macca33

I have 62cc combustion chamber size, but dunno the amount milled from stock (milled by ETP) and I am running 8.10", which give me about .060" preload on LS7 lifters. The valvetrain is extremely low noise - less noise than my last cam on XE lobes and I am now running LSK - LOVE the new cam, it is utilising the benefits of the ETP heads very well.

Cheers,

Macca

TARZAN

iTrader: (12)

vettenuts,

I ordered custom chrome moly pushrods through TSP, they are larger

macca,

Thanks for the reply...and glad to hear you like the lobes, I'm trying them out with my latest cam.

-Will

macca33

No worries Will. I only went from an XE-lobed 222/224 to an LSK-lobed 224/228, but it has a heap more torque and made about 30hp more at the top-end. Unfortunately, I couldn't overlay the new graph to my old one, but from plotting the numbers, it has gained at least 10hp everywhere, up to the 30hp from around 5000rpm upwards.

My AFRs peak at 12.2:1 at present, so there is still a fair bit of timing that it will be able to take and I reckon I'll be even more happy with the result after I've had the tune tweaked. I reckon there is at least another 10-15 hp to be found once the timing is added.

You will love the LSK lobes and my valvetrain is now actually a tad quieter than the XE lobed cam I took out - go figure?!?

Here is a copy of the dyno sheet, done on a brand new DD twin-retarder chassis dyno:-



Cheers and good luck with yours,

Macca