Slow89Iroc-Z

I am having the problem in the pic where the spring/retainer is slamming into the trunion of the rocker. The pic is of another members rocker so I am not having any problems with the tip under the black "X's". I am having the problem where the black circle is. The white spot is where the interference is. What is causing this?? I am having the problem on only cylinders 1, 3, 5, and 6. I am running trickflow 23 degree wheads, ARP studs, 7.3in push rods and the Crane 1.6 ratio roller rockers non self aligning with guide plates.

RB83L69

Looks to me like your push rods are too short.

Get an adjustable one, and floow the instructions that come with it.

AlkyIROC

Agreed. You need to buy proper length pushrods. Apparently stock length pushrods are too short. Buy a checking pushrod to determine the proper length required.

Slow89Iroc-Z

Doesnt it seem odd that its only happening on certain cylinders? The pushrods I am using are 7.3in long which are +.100 longer than stock. This is what was recomended by Trickflow. The pattern that roller tip makes on the valve stem is towards the exhaust side on the stem. Would longer pushrods bring the pattern closer to the intake and give me more clearance for the rocker trunion?

Also could this cause the valve guide to wear prematurely and cause oil in those cylinders?

AlkyIROC

Guessing at .100" longer pushrods is just as bad as using stock ones. For all you know, .100" longer is still too short. If it's only hitting on a few cylinders then I'd say the spring installed height isn't the same on all cylinders. It also depends on the diameter of the springs. Some rockers just won't work with bigger springs. Get rid of those cheap aluminum rockers and pick up some Comp Pro Magnum rockers.

When I installed my new aluminum heads and roller cam I had to change all my pushrods. BBC intake and exhaust are different lengths. I think it's my exhaust that's now the same length as a 429 Ford. Intake is a custom length. both were roughly .300 longer than stock. Pushrods can be made in just about any length. Off the shelf lengths are .025" - .050" apart

AlkyIROC

Too many factors affect the required pushrod length. Smaller base circle cams. Length of lifter. Head gasket thickness. Spring installed height will all require a custom length pushrod.

ross

I had this problem when I went solid roller. The bigger springs I used a crane cam and everything they wanted me to use ie spring retainers locks. I also always check the push rod length and order the correct length called crane when my comp cam rockers hit they told me I needed crane gold rockers I bought there rockers still had the problem next call the tech tells me to order lash caps. With the lash caps I had to get another set of push rods. Here comes the best part thay still rubbed call crane agin the tech tells me its ok to grind some material from the spot you circled. Things to try before grinding 1-different style spring retainer 2-lash caps and correct push rod for added valve length. 3- Call the manufactor of the rockers and ask for some insite.

Grim Reaper

Len, I hope your friend is not using guideplates with those particular rockers; those are self-aligning and don't use guideplates.

Slow89Iroc-Z

Glenn
I am not sure whose pic that is. I am running the non S/A roller rockers with guideplates however....I am about to kill my car tho

88 350 tpi formula

iTrader: (9)

what size springs are on those heads? I had to make sure the roller rockers are clearnced for them. the ones in your picture don't look like it.


when you look at roller rocker specs it should say what diameter springs will clear. (such as.. for springs up to 1.550" or for 1.630" spring)



if those are crane cam rockers you are using (which I think you said) you may have bought the none clearanced ones. they have a differant part number for those

Slow89Iroc-Z

the springs are 1.47in od. The rockers are part number 10759-16 they are good for 1.63in springs

ross

Is this a motor that you have been runing for some time or is it a brand new set of heads and rockers? Reason I ask is because if the heads have some miles on them I woulde check the retainer esp on a 7 deg retainer for the valve pullig thru.