V-10 Killer

iTrader: (22)

I bolted down my ET heads last night, and was using a Comp Cams pushrod length measuring tool to try to get the proper pushrod length. I tried two different cylinders. And on each, when I found the right length for the intake pushrod, it wasn't long enough when used in the exhaust. I wound up unbolting the head to check for collapsed lifters (none found, all brand new anyway). After that, I had to take it back in to the shop to have the test springs pulled back out. The shop owner looked at the heads and pointed out to me that if you look along the valve tips, every other valve tip is a little longer.

I just want to make sure this is normal before I go any further.
Anyone have previous experience with this, and if so, how much difference is there between lengths on your pushrods?

Thanks

Haans249

iTrader: (24)

Yes, I do believe that there are two different size pushrods that are needed. Thats why its always better to check the length before you fire her up! Too bad you unbolted the head and went through all that extra work...=(

Best Regards,
Adrian

V-10 Killer

iTrader: (22)

Oh good, thanks.

I had to unbolt it anyway to get the test springs off and put the duals back on. Oh well, I read somewhere that you should torque and release ARP studs 3 times to cycle "pre-stretch" them, before your final torque pattern. I guess I'm practically there now

SUX2BU

iTrader: (14)

Another thing is that some cams have a different base circle on the intake and exhaust lobes.

Phil99vette

iTrader: (11)

The 2 sets I installed needed the same length on both sides.

V-10 Killer

iTrader: (22)

Well, I tried again yesterday and noticed that the jam nuts on the test pushrod were interfering with the head, so I flipped it upside down and tried again. Although I still got two different lengths, it wasn't by more than say 0.015" on the valvespring side of the rocker. Took the pushrod in to be measured and came up with 8.058". After talking with LS1speed, I decided to settle with a 8.100" pushrod. Apparently, that's what ET performance has recommended for them to use, so that'll work for me. I might have a slightly different preload, but I don't think it'll be drastic enough to cause any problems.

Thanks once again everyone.

Tatoy

iTrader: (4)

Mine are the same lenght as well on both sides. Final length was a 8.80..

Wayne

CNB

iTrader: (4)

Mine used different lengths.

V-10 Killer

iTrader: (22)

That's the longest pushrod I've heard of yet!