350 push rods

[Motown]

Hi all

I am instaling a set of edelbrock performer cylinder heads on a chevy 350, my question is with using the stamped steel rockers do i need to use push rods that are .100'' longer? Has any body run into this?

[nitrowarrior]

Do your heads have .100" longer valves? If not, mock up the setup and check your tip location.

[Motown]

tip of the rockers seem to roll to the edge of the valve stem

[nitrowarrior]

Alignment problem, not a length problem. Guide plate on the heads?

[Motown]

yea, iv'e got guid plates, i just found on the edelbrock web site that if using stamped steel rockers,to use +.100'' push rod and if yur using roller tip rockers use stock push rods, but how would the lenth help the alignment?

[Motown]

i would think .100'' is a big difference in lenth, could there be a lot of damage if i use them and there wrong? it could not push the valve open any more than normal because the adjustment would be less right?

[nitrowarrior]

Denny is bending over backwards here......the research has been handed to you....it's not our motor...it's yours...have you not dug in and gotten the arrow straight on your compass? As simply as anyone can tell you; do the geometry check and align the pushrod attack on the valve stem. Look, Look, Look, see what is going on we'ed all be to help, just need some solid feedback from your findings. Yeah, by the way "MUCHO" damage if you run it like it is. I't not far from being perfect, just some clean info to help you out.

[Racecar100]

If the rocker tip on the inner edge of the valve stem you need longer push rods if it on the outter the push rod too long. The best set up is right ing the center when the valve is half way open.

[Dave Severson]

Best way to know for sure what length pushrod you need is to buy a pushrod length checker, they're cheap and accurate... Takes all the guesswork out of pushrod length selection. All the cam companies offer one for sale.

[Dave Severson]

Yes, if he looks at the picture I posted, the valve is depressed. The point of the picture is to show the rocker centered. As in parallel, to check the rocker contact point. If he then uses a dial indicater, he can move the rocker until it is centered, and the indicator will show the amount of movement.

Good system, but i stick with the idiot proof (me!) little checker that Comp sells!!!!!

[pat mccarthy]

if the rockers are hanging off the face of the valve stem you need a adjustable guild plates or alot of them are sloted were the studs go thru move them were the rocker are on the center of the stem and lock them down. as for the push rods .i check them at mid lift so there is no guessing the rocker arm may not be true ratio or small or big base circle cam the deck heads height and the valves height set up with longer stems or bigger roller tips on the rockers will all throw off the true push rod size

[Dave Severson]

Oh, you saying you like to work more ??

What could possibly be more simple or accurate then a push rod length checker and the mock up pushrod that comes with it?????? Set the push rod, measure it, order the length you need.....

[nitrowarrior]

Nw I'm confused, He said it's rolling to the edge. Stamped steel rockers don't roll, they wipe/swipe. Is this thing going off to the side of the valve stem or is what he's looking at actually the tip of the rocker contacting the valve stem during sweep motion?

[Dave Severson]

Exactly, dial indicator, and get the rocker centered.

IF there's no wear on the rocker, ball, or tip and IF everybody has a dial indicator and stand laying around, and IF your eyeball is dead flat accurate on making sure the rocker is centered.... sounds like a lot of variables to me.....

[Dave Severson]

Wouldn't that IF apply to the adjustable pushrod also ???

Nope, just tighten it against the stop, measure it. Lots less variables....